Krings Instructions for use - Emunds + Staudinger GmbH

www.es-verbau.com 

Using instruction 

ThyssenKrupp Bauservice 

Pipe puller type SZ 10

Technical Information Krings Verbau 

Pipe puller 

Type: ______________________________________ 

Year of construction ______________________________________ 

Serial No. ______________________________________ 

Order No. ______________________________________ 

Recipient ______________________________________ 

2 Using instruction pipe puller 

Technical contents are subject to change. Publishing date 29/01/2010

Contents 

1. Preface 5 

2. Introduction and general information 6 

2.1 Introduction 6 

2.2 Liability and warranty 6 

2.3 General information on this manual and how to use it 7 

2.4 Key to symbols (pictograms) 7 

3. Handling, set-up and assembly 8 

3.1 General information 8 

3.2 Handling the pipe puller 8 

3.3 Preparing the pipe puller for operation 9 

4. Functions, overview of subassemblies and technical data 10 

4.1 Illustration of the pipe puller with its subassemblies and extra equipment 10 

4.2 How the pipe puller works 11 

4.3 Definition of intended use 12 

4.4 Technical data 12 

4.5 Electrical circuit diagram 13 

5. Safety instructions 14 


5.2 Special safety instructions 14 

6. Operating and control elements and their purpose 16 


6.2 Functions of the control elements on the control panel 16 

6.3 Control element for hydraulic pressure indication (manometer) 16 

7. Initial operation, operation and supervision 17 


7.2 Initial operation 18 

7.3 Operation 18 

7.4 Supervision 20 



Contents 

8. Malfunctions, causes and remedies 20 


8.2 Malfunctions 20 

9. Maintenance and servicing 21 


9.2 Overview of maintenance 22 

9.3 Maintenance as required 23 

9.4 Daily maintenance 25 

9.5 Monthly maintenance 26 

9.6 Annual maintenance 27 

10. Appendix 27 

10.1 Declaration relating to the manual 27 

Mention d’impression 28 



1. Preface 

Subject to change. 

All rights to this publication are reserved, and particularly the rights of duplication, dissemination and translation. 

No part of this publication may be reproduced (by photocopy, microfiche or any other method) or duplicated or 

disseminated by electronic means in any way without the prior written consent of ThyssenKrupp Bauservice 

GmbH. 

Print legend 


4th edition March 1995 

We advise you to keep the user’s manual for the pipe puller in a suitable place so that you can consult it directly 

at any time. 

Therefore store the manual carefully as you may need it later for the following purposes: 

- When moving the pipe puller to a new site 

- When modifying machine components 

- For the operation, maintenance and checking of the pipe puller 

- For training purposes 

- For independent study. 


2. Introduction and general information 

2.1 Introduction 

This manual is intended as an aid to staff responsible for operation, supervision and maintenance of the pipe puller. It contains 

a detailed description of the various operating steps, information on initial and subsequent operation of all the units and 

equipment belonging to the pipe puller, and instructions on maintenance and servicing in so far as operating staff are 

responsible for this. 

Malfunctions that staff are unable to remedy locally should be reported to our After-Sales Service for assistance. 

ThyssenKrupp Bauservice GmbH 

Ottostr. 30 

41836 Hückelhoven 

Germany 

Phone 02433 453-0 

Fax 02433 453-100 

E-Mail es-krings@thyssenkrupp.com 

2.2 Liability and warranty 

All details and instructions concerning the operation and maintenance of the machine are given to the best of our knowledge on 

the basis of our experience and findings to date. 

We are liable for any errors or omissions on exclusion of all further claims in accordance with the warranty obligations entered 

into in the main contract. Claims for any further compensation for damages on whatever legal grounds are excluded. 

The manual is also translated to the best of our knowledge. We cannot accept any liability for incorrect translation, and not even 

if the translation was carried out by us or on our behalf. The German text alone is authoritative. We would be happy to supply it 

on request. 

This manual must not be passed on to third parties. Such acts are subject to compensation for damages. 

i 

Liability and warranty claims are excluded: 

- if the information and instructions contained in the manual are disregarded, 

- if the pipe puller and the associated equipment are incorrectly operated or their handling deviates from the 

procedure described. 

- if the pipe puller is used for purposes for which it is not intended, 

- if protective devices are not used or disabled, 

- if functional modifications of any kind are carried out without our written consent, 

- if the relevant safety instructions are disregarded (see the chapter on safety in this manual), 

- if the pipe puller and the associated equipment are maintained incorrectly (or at incorrect intervals), which also 

includes the use of the prescribed replacement parts. 

Batteries, hydraulic hoses, electric cables and slings are wearing parts and are not covered by the manufacturer’s 

warranty. 

Only the original or equivalent parts approved by the manufacturer are to be used as replacement or spare parts. 

Liability and warranty claims are excluded in the event of non-observance of this point. 



2.3 General information on this manual and how to use it 

1. During handover, the manufacturer explained how to operate and maintain the pipe puller. However, before you 

use the machine, please read this manual carefully. The specially marked safety instructions must always be 

observed! 

2. Do not put this manual unread to one side, even if you have already operated such a machine or one of a similar 

kind. 

3. The supplied pipe puller is designed and manufactured in accordance with the KRINGS-VERBAU GmbH 

specifications and accident prevention rules. To prevent accidents and to ensure optimum performance, no 

modifications or conversions may be carried out on the pipe puller unless these are explicitly approved by KRINGS- 

VERBAU GmbH/ThyssenKrupp Bauservice GmbH. 

4. Important instructions, such as those relating to safety, are marked with appropriate symbols. 

5. Comply with these instructions in order to prevent accidents, damage to the pipe puller and personal injury (for an 

explanation of the symbols, see next section). 

6. The operator is obliged to observe the relevant environmental protection provisions and his duties concerning the 

disposal of wastes (hydraulic fluid change, battery acid, cleaning agents etc.). 

7. This manual uses the internationally standardized SI units of measurement. 

8. All details in brackets in the following refer to more detailed explanations on the pages named. 

9. The passages marked with asterisks (*) refer to optional extras that have supplementary or extended functions. 

These passages may or may not be relevant, depending on the scale of your order. 

2.4 Key to symbols 

i 

Danger area 


Danger: Suspended loads 

Information 

Danger: High voltage! 

Danger: Obstacles. Watch your step. 


3. Handling, set-up and assembly 

3.1 General information 

The pipe puller is usually supplied in a sturdy shipping crate. The shipping crate contains the following in accordance with your 

order: 

- The complete pipe puller with fitted socket clamp, installed 12 V battery and integrated hydraulic control block 

- The control cable with connection plug and control panel 

- Various connection and small parts. 

i 

It is advisable to check the entire consignment for completeness and any shipment damage immediately on 

arrival. This is possible by referring to the delivery note and accompanying papers. 

In general, complaints will only be accepted if they are reported to the forwarding company or ThyssenKrupp 

Bauservice GmbH on the day of arrival of the pipe puller. 

At its place of use, the pipe puller must be handled and prepared for initial operation in accordance with the 

following instructions. 

3.2 Handling of the pipe puller 

The pipe puller must be brought to its place of use by a crane or equivalent lifting gear (excavator) and with a suitable sling, as 

shown in the figure below. Proceed as follows: 

Only use the sling attachment points marked in green. Any rings not marked in green are solely of relevance for assembly. 

Suspending the pipe puller from these assembly rings risks injury to persons and damage to the machine. 

- Tilt the socket clamp (1) onto the pipe carriage (2) so that it engages behind the threaded securing pins on both 

sides (3). 

- Attach the hooks of the double sling (4) to the ring nut (5) and bar (6). The handling ring is identified by its green 

paint. From the upper ring of the double sling, the freely suspended pipe puller can now be moved with suitable 

lifting gear. 

- Move the pipe puller to its place of use and set down. 

- During handling, make sure that the pipe puller can never bump against other objects while suspended from the 

crane. 

- Remove the double sling. 

CAUTION 

Keep away from the suspended load and out of the excavator’s or crane’s slewing range. 

Lifting gear must be suitable for the pipe puller weight of approx. 456 kg! 



3.3 Preparing the pipe puller for operation 

The manufacturer has supplied you with the pipe puller in a prepared state. This means 

- with a charged battery (the associated battery charger is not included in the equipment supplied) 

- filled with hydraulic fluid. 

So that the pipe puller can be put to use, only the following steps have to be taken: 

- Use the plugs (2) to connect the power supply cable (1) 

to the polarized jacks (3) of the power supply unit. 

- Insert the plug (4) of the control cable (5) into the pipe 

puller socket (6) and secure; alternatively, depending on 

conditions, connect the control cable to the cable drum (7) 

and plug the latter into the pipe puller socket. 

Caution! 

The pipe puller may only be operated with the cable drum 

connected. Unreel the required length of cable. Keep out of the 

danger range of the taut pulling rope when operating the pipe puller. 

Keep out of the pipe when operating the KRINGS pipe puller! 

- The socket clamp (8) must also be brought into the vertical. 

The pipe puller is now ready for operation. Its height must be adapted on site to the diameter of the pipe being pulled (see also 

section 7). 



4. Functions, subassemblies and technical data 

4.1 Illustration of the pipe puller with its subassemblies and extra equipment 

Key 

1. Pipe carriage with 5 Control panel with cable drum 

1.1 undercarriage 5.1 Control cable 

5.2 Connection plug 

2 Hydraulic pulling cylinder with 

2.1 front gripper, 6 Socket clamp with 

2.2 rear gripper and 6.1 rotary spindle, 

2.3 hydraulic opening cylinder 6.2 support, 

6.3 tilt device with 

3 Battery case 6.4 threaded securing pins on both sides and 

6.5 bar 

4 Drive unit 

4.1 Hydraulic fluid tank 7 Ring 

4.2 Hydraulic unit 

4.3 Connection point for control cable 

4.4 Electrical switch cabinet 



4.2 Functions 

The compact design and integrated functional components of the pipe puller permit the efficient pulling and joining of pipes of 

all kinds, e.g. concrete pipes, stoneware pipes etc. of a wide range of diameters. 

The pipe puller is composed of the following functional components: 

1. Undercarriage 

2. Hydraulic pulling cylinder with two grippers (at the front and rear) and a hydraulic opening cylinder 

3. Battery case 

4. Drive unit 

5. Socket clamp 

6. Extension tube, complete* 

7. Control panel complete with control cable and connection plug 

8. Rings 

9. Accessories 

The pipe carriage with its welded design carries all the above-mentioned functional components. It runs on angled hard 

rubber wheels. This angled arrangement enables the pipe puller to run smoothly inside pipes. 

Installed and locked in the centre of the pipe carriage is the pulling cylinder with a fitted gripping cylinder and the front and 

rear grippers. The max. stroke of the pulling cylinder, i.e. the pulling length of the pipe puller, is 500 mm per cycle. The 

battery case attached to the side accommodates the 12 V/160/180 Ah battery and has external + and - terminals that are 

connected via cables to the switch box on the opposite side. The drive unit is also situated on the opposite side. 

This unit consists of a hydraulic control block with solenoid valves and, installed immediately beneath, an electrohydraulic 

pump with a pressure indicator. After input of the relevant control commands at the control panel, this is used for the pulling 

process and for opening and closing the grippers. 

The pulling element is an 18 mm diameter steel rope equipped with a load hook at one end and with the other end tapered 

and brazed. 

The steel pulling rope is fastened by means of the attached hook to the double sling. The double sling is hooked onto the rings 

on the ends of the selected pulling beam. The pulling beam is inserted in the pipe to be pulled by a labourer and held fast until 

the first pull. For the pulling process itself, the labourer must leave the trench. 

The other, tapered end of the steel pulling rope is passed over the opened cheeks of the front gripper, through the cylinder 

and over the cheeks of the opened rear gripper. 

The thrust bearing is the socket clamp which has to be positioned vertically with its support in the pipe socket with the aid of a 

spindle with a trapezoidal thread, possibly making use of an extension tube. We wish to explicitly point out that the socket 

clamp must only ever be used with a single extension tube. The spindle is extended with hand grips until the pipe puller is 

firmly anchored in the socket. 

The hydraulic pulling cylinder is retracted when the appropriate buttons are pressed. The gripper automatically closes and the 

pipe is brought into position by the steel pulling rope. 

The operating procedure for the pulling process is described in detail in 7.1 and the following sections. 



4.3 Definition of intended purpose 

Caution! Compliance with the details of this section is absolutely essential. Using the pipe puller for any other 

purpose excludes claims under the manufacturer’s liability and warranty. 

The pipe puller may only be used for its intended purpose (3/2-5). Any other use is impermissible and releases the 

manufacturer from any liability and warranty obligations. 

This manual must be available to the user and to maintenance and servicing staff whenever the pipe puller is in use. Store a 

copy of this manual on the construction site close to the pipe puller. Keep a copy of this manual available during maintenance 

and servicing work. 

Check the technical condition of all bracing elements (socket clamp, pulling beam) before using the pipe puller. 

Damaged parts must not be used. The pipe puller must not be operated with damaged parts. 

Use only the parts belonging to this pipe puller. 

Watch out for corrosion. Corroded machine components have properties differing from those of new components. Both 

function and safety may then be at risk. 

Before setting up the pipe puller, skilled operatives (5/1) must check the structural loads for the selected set-up with reference 

to all conditions and guidelines. 

4.4 Technical data of the pipe puller 

Suitable for pipe diameters 800 – 2,400 mm 

Steel pulling rope with hook 

Diameter 18 m 

Length 35 m (50 m, 60 m) 

Pulling cylinder stroke 500 mm 

Electrohydraulic gear pump 1.4 kW; 2,200 rpm; 12 V 

Working pressure Max. 160 bar 

Max. pulling force 107 kN 

Hydraulic fluid DEA ECONA E46 

biodegradable 

Hydraulic fluid quantity 15 L 

Power supply Battery; 12 V/160/180 Ah 

Total weight Approx. 456 kg 

Design Splash-proof 

Paint colours Yellow (RAL 1004) 

Red (RAL 2002) 

Green 



4.5 Electrical circuit diagram 



5. Safety instructions 


The rules, instructions and safety provisions given in this section must be observed and complied with at all times. 

The pipe puller may only be operated by persons trained and instructed for this task. 

Lack of knowledge may result in damage to the pipe puller and put the operator at risk. 

The user is defined as follows: 

i 

a) A skilled operative is someone who, thanks to his specialized training, knowledge, experience and familiarity with 

the relevant provisions, is capable of assessing the tasks the entrusted to him and identifying possible risks. 

b) An instructed person is someone who has been briefed on the tasks entrusted to him and the possible risks in the 

event of inappropriate action and possibly taught on the job and instructed on the necessary protective devices 

and protective measures. 

c) A layperson is someone who is neither a skilled operative as defined in a, nor an instructed person as defined in b. 


This applies particularly to maintenance and servicing and the inspection and remedying of malfunctions. 

Before using the pipe puller, operating and maintenance staff must be familiarized in detail with the unit and its parts. Before 

the machine is used for the first time, staff must be informed and instructed of danger areas in a safety training session. This 

safety training must be repeated as required. 

5.2 Special safety instructions 

When working on the pipe puller, i.e. during maintenance, adjustment and repair work, all drives capable of causing a 

potentially hazardous motion, must be disabled, e.g. motors, hoses, cylinders etc.). 

All operating and control elements as well as shut-off and control fittings of the pipe puller may only be operated by trained 

and authorized staff. 

i 

Obstacles, such as cables etc., must be eliminated or, if this is not possible, marked with suitable bicolour 

adhesive hazard warning tape. 

Injuries, even minor wounds, must be treated immediately to exclude the risk of infection. 

Traffic and escape routes must be kept free at all times. 

All accidents (personal injury or damage to property) must be reported immediately to the person in charge and 

the safety officer. 

The pipe puller is designed for compliance with the existing relevant rules and safety instructions for accident prevention 

assuming that it is used for its intended purpose and operated correctly. 

i 

We must also point out that the pipe puller must only be used for its intended purpose, with the exclusive 

use of original KRINGS parts. The manufacturer’s liability and warranty are excluded in the event of nonobservance. 


Note: 

- All the provisions of the statutory accident insurance institution for the German civil engineering industry (TBG) 

otherwise apply as well as 

- DIN 4124 “Excavations and trenches; slopes, breadths of working spaces, planking and strutting”. 

- Our products bear the TBG-GS “tested safety” mark. 

- Work on the hydraulics may only be performed by skilled operatives (5.1). In cases of doubt, consult the 


ThyssenKrupp Bauservice After-Sales Service. 

- Do not carry out any work on the hydraulic system as long as the system is under pressure. Release the pressure 

from the hydraulic system before conducting maintenance and assembly work. 

- Do not release any screw joint on the KRINGS pipe puller while it is in operation or under load. 

- If the hydraulic fluid becomes excessively hot (characteristic smell), switch the KRINGS pipe puller off. Wait until 

the hydraulic fluid has cooled. 

- The service life of the hydraulic hoses is 3 years from delivery. Replace the hydraulic hoses at the end of this 

period. Failure to replace them puts staff and the pipe puller at risk. 

- Work on the electrics may only be performed by skilled operatives (5.1). In cases of doubt, contact the 

ThyssenKrupp Bauservice After-Sales Service. 

- Before carrying out assembly or maintenance work on the electrics, disconnect the power supply by detaching the 

minus terminal from the battery. 


6. Operating and control elements and their purpose 


Before using the machine for the first time, familiarize yourself with the function of the operating and control elements. This way 

you improve occupational safety and the quality of your work and at the same time reduce the risk of operating the pipe puller 

incorrectly, which may result in personal injury and damage to the machine. The purpose of these elements is explained in detail 

in the following. 

6.2 Functions of the control elements on the control panel 

No. Operating/control element Function 

1 White pushbutton OPEN Pressing the OPEN pushbutton opens the rear gripper and signal lamp 5 

indicates that the gripper is fully open. 

2 Black pushbutton CLOSE Pressing the CLOSE pushbutton closes the rear gripper and signal lamp 5 

indicates that the gripper is fully closed. 

3 White pushbutton EXT Pressing the EXT pushbutton extends the cylinder. When it reaches its limit 

position, the front gripper opens and signal lamp 5 indicates that the 

cylinder is fully extended. 

4 Black pushbutton PULL Pressing the PULL pushbutton retracts the cylinder. Its limit position is 

indicated again by signal lamp 5. 

5 Yellow signal lamp MAX. PRESS The functions of this signal lamp have already been explained above. It 

and multifunctional display also lights up when the set working pressure of 160 bar is reached. 

6 White signal lamp ON This signal lamp lights up when during the pulling process about 120 mm 

of stroke is left. This signal is issued by a limit switch that monitors cylinder 

travel. 

6.3 Control element for hydraulic pressure indication (manometer) 

The hydraulic pressure indicator is an instrument with a circular dial with two scales, 

in bar and psi. The measurement range extends from 0 to 250 bar and 0 to 35,000 psi. 

The electrohydraulic control unit has a factory-set pressure limit of 160 bar. When this 

pressure is reached, the signal lamp MAX. PRESS on the control panel lights up. 

This can be checked with the manometer for maintenance purposes (9.1 ff.) and to 

remedy malfunctions (8.1 ff.). During normal operation, the manometer is not visible 

as it is in the pipe together with the pipe puller. 



7. Initial operation, operation and supervision 


On the assumption that you have read and understood the preceding sections of this manual, you can now use the pipe puller for 

the first time. 

Daily routine checks 

- Check all the relevant operating and control elements for correct function. 

- Make sure before machine use that there is nothing that can prevent a smooth, trouble-free mechanical process. 

- Are the limit switches working properly? 

- Have the regreasable bearings been checked for a sufficient filling of grease? (See maintenance instructions in 

section 9.) 

- Has the battery been fully charged with the charger (not part of the supplied equipment)? 

- Is there sufficient fluid in the hydraulic system? (Check with fluid dipstick, see figure.) 



7.2 Initial operation 

Once all the above checks have been carried out and no problems have been found, proceed as follows: 

- The pipe puller is supplied in a prepared state. The battery has been charged and the hydraulic system is full of fluid. 

- No special measures have to be taken for initial operation. 

7.3 Operation 

- The pipe puller is supplied ready for operation. All that has to be 

done now is connect the power supply cable (1) to the power 

supply unit by inserting the plugs (2) in the polarized jacks (3) 

(see adjacent figure). Then insert the plug (4) of the control cable 

(5) in the socket (6) of the rope puller and secure. Connect the 

control cable to the control panel (see adjacent figure). 

- Carry out the routine daily checks (7.1). 

- Using suitable lifting gear (3.2), lift the fully operative pipe puller 

into the excavated trench. Move the pipe puller into a pipe that has 

already been laid. 



Clamp the pipe puller in the cleaned pipe with the socket clamp (4.3). Position the pipe puller parallel with the pipe 

axis and horizontally, with its support under the socket of the already laid pipe. Extend the spindle with the hand grips 

until the pipe puller is firmly anchored (4.3). Before the first pull, check that the pipe carriage really is firmly 

positioned. The socket clamp has to be tightened again after the first pull. 

Connect the steel pulling rope to the pulling beam via the double sling. Insert the pulling beam horizontally into the 

pipe. The steel pulling rope is thus held in this position at the same height as the pulling beam. The double sling must 

have ropes of equal length. 

Bring the control panel and control cable out of the danger zone of the pipe puller. The pipe puller must not be 

operated from within the pipe puller’s danger zone (7.5). 

- Open the rear gripper by pressing the ON pushbutton (1) on the control panel. 

- Extend the pulling cylinder by pressing the EXT pushbutton (3) on the control panel. When it reaches its limit position, 

the front gripper opens automatically. 

- Lay the steel pulling rope in both grippers. 

- Initiate the pulling process by pressing the PULL pushbutton (4) on the control panel. If the stroke of 500 mm is 

insufficient, the steel pulling rope has to be tensioned again. The pulling process has to be discontinued if the ON 

signal lamp (6) lights up. 

- Close the rear gripper by pressing the CLOSE pushbutton (2). 

- Extend the pulling cylinder by pressing the EXT pushbutton (3). The front gripper opens automatically as soon as it is 

free of load. 

- Initiate the pulling process by pressing the PULL pushbutton (4) on the control panel. After briefly pulling, open the 

rear gripper by pressing the OPEN pushbutton (1) on the control panel. 

- Release the pulling beam. Proceed in the same way for other pipes. 



7.4 Supervision 

i 

Make sure during the pulling process that no one is within the danger zone of the taut steel pulling rope and of 

possible entrapment risks in the area of the pulled pipe. 

Angled (non-horizontal) pulling ropes are not permitted. 

If the hydraulic fluid becomes excessively hot (characteristic smell), switch the KRINGS pipe puller off. Wait until the 

hydraulic fluid has cooled. 

If the pulling process is interrupted without the MAX. PRESS signal lamp (5) lighting up, check the battery’s charge 

level. Replace or recharge battery (6.2, 9.2). 

8 Malfunctions, causes and remedies 


This section describes malfunctions that can occur during the work process with their possible causes and remedies. 

i 

Malfunctions of the electrical systems and those affecting the mechanics and hydraulics that are not covered below 

may only be remedied by skilled staff. The general rules for the elimination of malfunctions in accordance with 

accident prevention regulations must always be observed. 

During the work process, the following malfunctions can occur on the properly maintained pipe puller. 

- The pipe puller doesn’t pull. 

- The pipe puller runs out of the pipe. 

8.2 Malfunctions 

1. The pipe puller doesn’t pull. 

Cause Consequence Remedy 

Battery not charged The MAX. PRESS signal lamp Recharge the battery or replace it 

fails to light up. with a charged battery. 

Obstacle in the pipe puller’s path The MAX. PRESS signal lamp lights up. Remove the obstacle. 

The gripper cheeks don’t grip. The hydraulic pulling cylinder retracts Replace the cheeks and check the 

without pulling the steel pulling rope. springs as described in 9.4. Tighten 

screw on rear gripper if necessary. 

Steel pulling rope broken Steel rope sags during pulling process. Replace steel rope. 

Motor of the hydraulic. The pipe puller doesn’t pull The MAX.. Have the motor checked by one of 

unit doesn’t work PRESS signal lamp on the control panel our fitters or specialist staff. 

fails to light up. The battery is charged 

and all the electrical cables are connected. 

2. The pipe puller runs out of the pipe. 

The socket clamp isn’t firmly The pipe puller runs out of the pipe during Check and reposition the pipe puller in 

clamped in the pipe. the pulling process. the pipe with the socket clamp. Adjust 

with the appropriate extension tube. 

Retighten after the first pull (4.3). 



9 Maintenance and servicing 


Meticulous maintenance of the pipe puller keeps it in good working order and extends the service life of important parts and 

components. 

This section describes the tasks and checks that are to be carried out by trained operating staff at the intervals given. 

i 

The maintenance and servicing tasks must be carried out in observance of the provisions of the law and ordinances, 

e.g. accident prevention rules, Workplace Ordinance, Hazardous Substances Ordinance etc. They must be carried 

solely by skilled and trained staff or by the ThyssenKrupp Bauservice Sales Service.. 

Cleanliness keeps the Krings pipe puller in good working order. Regularly remove excessive dirt. Only then can you 

spot in good time wear and any repairs that may be necessary before expensive consequential damage occurs. 

To ensure optimum and trouble-free operation of the pipe puller, the following tasks should be regularly performed at the given 

intervals. 

Note 

The intervals differ from user to user, i.e. they depend, for example, on the frequency of equipment use and 

on the number of shifts worked (single or multiple shifts). 


In this connection we refer to DIN 31051, Part 1, “Maintenance, concepts and measures”. 

Caution 

Only the original or equivalent parts approved by the manufacturer are to be used as replacement or spare 

parts. Liability and warranty claims are excluded in the event of non-observance of this point (see 2.1 and 

2.2). 


9.2 Overview of maintenance 

Maintenance tasks 

Battery X 

Electrical contacts, check plug 

connections 

Electrical supply lines X 

Control cable with plug, control panel X 

Hydraulic hoses X 

Pipe pulling cylinder X 

Hydraulic pump housing X 

Check gripper cheeks X 

Check springs X 

Check steel pulling rope X 

Check wheels X 

Grease wheel axles X 

Replace hand grips X 


Intervals 

As required Daily, 

every 8 

h 

Visual and functional check X 

Electrical power supply X 

Check hydraulics X 

Clean machine X 

X 

Monthly, 

every 

160 h 

Hydraulic pump housing damp? X 

Grease socket clamp spindle X 

Grease gripper axles X 

Grease battery terminals X 

Annually, 

every 

2,000 h 

Change hydraulic fluid X 

Clean fluid filter X 


9.3 Maintenance as required 

Re-apply the anti-corrosion coating on the Krings pipe puller as required. Make sure that no elastic seals or bearings come into 

contact with paints and thinners. 

. 

- Observe the maintenance instructions for the battery. 

These are on the top of the battery in the power supply unit. 

- Check the electrical contacts/plug connections. When inserting 

the plugs (2) of the power supply cable (1) into the 

polarized jacks (3) on the battery case, check the plugs and jacks 

for damage, a tight fit and corrosion. Replace the 

plugs or jacks as required. 

- Check the electrical supply lines for damage to the insulation, 

kinking or crushing and replace if necessary. 

- Check the hydraulic hoses for leaks, damage to the outer sheathing, kinking or crushing. In the event of damage, 

these must be replaced by specialist staff. The screw joints can be tightened with suitable tools if necessary. 



- Check the pipe pulling cylinder (1) and opening cylinder (2) for leaking fluid. In the event of fluid leaks on the pipe 

pulling or opening cylinders, the pipe puller must be switched off and a repair carried out by one of our fitters or a 

skilled operative. 

- The hydraulic pump housing (3) must be checked for mechanical damage and tightness. The thread of the lid on the 

front must be checked for completeness and tightness. Any defects must be eliminated. The lid seal must be checked 

for tightness and damage and replaced if necessary. 

- Check the cheeks (4) of the grippers for wear. If the cheeks are strongly worn, the steel rope may slip. Should the 

cheeks of either of the grippers be strongly worn, replace them. Remove the plugs of the power supply cable from 

their jacks (9.2). Remove the split pins (7) and those of the springs (8). Drive the gripper axles out of their holes with a 

pointed tool. Replace the worn cheeks with new original Krings replacement parts. To reassemble, adopt the above 

procedure but in reverse order. Grease the axles with roller bearing grease beforehand. 

- Check the springs (8) of the grippers (5) for correct function. Replace if necessary. 

- Check the steel pulling rope (6) for wear. Replace if it is strongly worn or mechanically damaged. Bear in mind the 

danger of a snapping rope. 

- Check the wheels (9) for smooth running and damage. If they do not run smoothly or are mechanically damaged, 

they must be replaced with original replacement parts. Grease the bearings as required with roller bearing grease. 

- Check the wheel axles for mechanical damage. Any damage must be eliminated by skilled staff or one of our fitters. 

- Check the plastic-covered grips of the spindle for damage. Replace the plastic grips as required with original 

replacement parts. 

- Take appropriate measures to protect the machine as a whole from corrosion. 



9.4 Daily maintenance 

i 

1. Visual and functional check of all operating and control elements 


- Signal lamps. Pressing the EXT pushbutton (3) on the control panel extends the pulling cylinder. When it reaches 

its limit position, the front gripper opens and the MAX. PRESS signal lamp (5) lights up yellow. By pressing the 

PULL pushbutton (4) on the control panel, the pulling cylinder retracts. When only about 120 mm of stroke is left 

during the pulling process, the ON signal lamp (6) lights up white. Should any of the signal lamps fail to light up, 

the bulb must be replaced. To this end, carefully unscrew the coloured cap over the signal lamp to afford access 

o the faulty bulb. Check the bulb and replace if necessary. Then check again for correct function. 

- Pushbuttons. The EXT and PULL pushbuttons have already undergone a functional check. Pressing the OPEN 

pushbutton (1) on the control panel causes the rear gripper to open. Pressing the CLOSE pushbutton (2) on the 

control panel causes the rear gripper to close again. 

If any of the above functions fails to be performed, the control panel must be inspected by one of our fitters or a 

skilled operative and repaired if necessary. 

- Limit switch on the rope pulling cylinder. When only about 120 

mm of stroke is left, the ON signal lamp must light 

up. If the bulb is faulty, it must be replaced. If the signal lamp 

still fails to light up, the limit switch on the rope pulling cylinder 

(see adjacent figure) must be inspected by one of our fitters or 

a skilled operative and repaired if necessary. 

2. Electrical power supply. 

Charge the battery with a suitable charger*. 

(Charger not included in the equipment supplied.) 

3. Hydraulics Check the hydraulic fluid level with the dipstick, 

with the pulling cylinder in its retracted state. 

Cleanliness here is essential. Clean the entire top of the, 

hydraulic fluid tank beforehand. If sufficient fluid is in the 

tank, the level is between the two markings (see adjacent figure). 

Check the dipstick before use for any dirt sticking to it and wipe 

clean with a soft cloth. Top up with DEA ECONA E46 if necessary 

by pouring fluid into the hole otherwise occupied by the dipstick. 


Protect the pipe puller from penetrating water and flooding. Do not leave the pipe puller unattended in 

trenches (e.g. overnight or at weekends). 


Please bear in mind that the pipe puller is splash-proof only (4.4). 

In the event of flooding, we advise the following procedure: 

1. Recover the pipe puller from the trench. 

2. Do not put the pipe puller back into service! 

3. Send the pipe puller to the manufacturer’s plant for inspection and repair. 

Condition of the hydraulic fluid 

The ageing of the hydraulic fluid depends on the pipe puller’s operating conditions. Ageing and serviceability can be assessed 

with a simple visual inspection. 

Darkening 

Overheating, failure to change the fluid in time or mixing with a different fluid. 

Cloudiness 

Penetration of water or air 

Air bubbles 

Penetration of air, e.g. as a consequence of too little fluid or a leaky intake line. 

Suspended or deposited impurities 

Abrasion, dirt, products of ageing 

Smell of burnt oil 

Overheating 

All of these phenomena are signs of diminished quality. These defects and their causes must be remedied before resuming 

operation of the pipe puller. 

9.5 Monthly maintenance 

- Check the hydraulic pump housing for condensation. 

To this end, remove the drainage screw (see adjacent figure, 

arrow). Allow any condensation to completely drain out. 

Then screw the drainage screw back on. 

- Grease the socket clamp spindle via the lubricating nipple 

with the aid of a grease gun containing graphite grease. 

Remove any excess grease. 

- Grease the gripper axles. To this end, release the axles as 

above (9.4). Coat the axles with roller bearing grease. 

Then refit the axles with the method shown in 9.4 (see figure below). 

- Coat the battery terminals with terminal grease. 


9.6 Annual maintenance 

- Change the hydraulic fluid. Remove the magnetic fluid drainage screw (see figure on preceding page, arrow). Allow 

the old hydraulic fluid to drain out. Collect the old fluid and dispose of it in accordance with the applicable laws and 

regulations. Inspect the magnetic drainage screw for metal abrasion. In the event of such abrasion, the pipe puller 

must be inspected for possible damage by one of our fitters. After screwing the fluid drainage screw back on, fill the 

tank with new DEA ECONA E46 hydraulic fluid until the level on the dipstick is between the two markings. 

- Clean or replace the fluid filter. When replacing the hydraulic fluid, the filter in the fluid tank must be replaced with a 

new one. To this end, release the screws on the lid of the fluid tank. Then lift the lid seal so that the filter at the mouth 

of the intake pipe can be removed. After replacement, close the tank according to the above procedure, but in reverse 

order. 

- According to Art. 10 of the Workplace Ordinance, recurrent inspection of the pipe puller is obligatory. 

10 Appendix 

10.1 Declaration relating to the manual 

Supplement to the manual by ThyssenKrupp Bauservice GmbH as a result of legal provisions. 

This manual is based on that issued by Rücker GmbH on behalf of Krings Maschinenbau GmbH. 

The current edition is based on edition 07.94 and the changes agreed with Krings Maschinenbau GmbH on 20.12.94. 

We declare as follows: 

This manual is part of the documentation under the terms of the EC Machinery Directive. It is a precondition for the Declaration of 

Conformity for obtaining the CE mark. 

This manual complies with the following laws and guidelines: 

EC Machinery Directive, Appendix 5.6 

EN 292 T1, section 5.6 and T2, section 5 

Product Liability Act of 01.01.90, compliance with the Product Liability Directive, reference to “instruction obligation” 

The Equipment Act (GSG 3, paragraph 3); partially covered by the Machinery Directive since 01.01.93 

DIN V 8418; partially covered by the Machinery Directive 

Art. 823 BGB (German Civil Code), fault-related liability relating to machine operation and ensuring traffic safety 

TBG (accident insurance institution for the civil engineering industry) guideline 

Accident prevention regulations 

The technical and factual correctness of the manual together with the above-mentioned changes was ascertained on 20.12.94. 

We wish to explicitly note that the manual must not be amended without our knowledge. Warranty claims are excluded in the 

event of unauthorized changes. 

The warnings and pictograms to which the manual refers are attached by the manufacturer. 

Manufacturer: KRINGS VERBAU GMBH, Am Weidenhof 8, 52525 Heinsberg, Germany 



Mention d‘impression 

Éditeur 

ThyssenKrupp Bauservice GmbH 

Geschäftsbereich Emunds+Staudinger / Krings 

Ottostraße 30 

41836 Hückelhoven / Baal 

Germany 

Tel.: +49 2433 453-0 

Fax: +49 2433 453-100 

Email: ES-Krings@thyssenkrupp.com 

www.es-verbau.com 

Dessin, Production 

visaplan GmbH, Bochum 

www.visaplan.com 

.

Krings Instructions for use - Emunds + Staudinger GmbH

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