Tow eyes - Transpec

Tow eyesJune 2006Transport Specialties Ltd, Cnr Kerrs and Ash Rds, Wiri, P.O. Box 98971, South Auckland Mail Centre.phone: (09) 980 7300 fax: (09) 980 7306 email: mailroom@transpecs.co.nz

50mm Weld-in toweye• Pt #: 50mm/SS• D-value: 130kN• 65Wx 60Hmm shank x 440mm OA length• Weight: 10.5kgs• Static vertical support load: 1000kgs• Pt #: 50mm/LS• D-value: 314kN• 80Wx 75Hmm shank x 432mm OA length• Weight: 13.4kgs• Static vertical support load: 1000kgs(dependant on Dc and V-value)• DC-value: 90kN• V-value: 30kN3

50mm Weld-in tow eye(cont)Pt no. 10990173• D-Value:150kN• Up to 2500kgs static vertical load• Length face plate to eye centre: 331mm• Weight: 28.5kgs• GTW 20,500kg- Static vertical support load:2500kgs• GTW 25,000kg- Static vertical support load:1000kgsMounting Instructions• Fastening plate made of material St 52-3 DIN17100 is to be welded on so that the flangesidemarked with ‘0’ is facing up (circularwelding with fillet = 10mm radius).Before Welding:• Twist off the nuts VM16 DIN 980 quality 8from the screws M16 quality 8.8 at the sleeveand pull off the distance sleeve.• After welding: screw up all 4 nuts (oil applied)and tighten them alternatively and regularlyuntil the tightening torque of 200+10Nm isreached.• After the first 1500-3500kms check torquesettings. If necessary, re-tighten.4

Flange mount tow eye40mm Pt no. 10990548• D-Value:125kN• 6 bolt holes• Overall length: 304mm• Weight: 10kgs• Static vertical support load: 1000-2000kgs• DC-value: 100kN• V-value: 36kN• Screw Specs: M16 x 50 DIN9 12-10.950mm Pt no. 10995337• D-value: 190kN• 8 bolt holes• Overall length: 311mm• Weight: 11.2kgs• Static vertical support load: 1000-2500kgs(dependant on Dc and V-value)• DC-value: 100-135kN• V-value: 45-75kN• Screw Specs: M16 x 50 DIN9 12-10.9Backing Plate Pt no. 2498405• D-Value:150kN• Suitable for both 40mm and 50mm flange mounttoweyes5

Flange mount tow eye(cont)40mm Bolt kit Pt no. 08992835• 6 bolts, grade 8.850mm Bolt kit Pt no. 14990561• 8 bolts, grade 10.940mm Pt no. 10990548KIT50mm Pt no. 10995337KIT• Flange mount toweye kit (includes toweye, plate andbolts)Mounting Instructions:• Screw Specs: M16 x 50 DIN9 12-10.9• Pre-torque screws to 100Nm (74ft.lbs)• Torque screws to 280Nm (207ft.lbs) in sequence 1-8• Re-torque screws after 1500-3000kms6

DrawingsPlease also refer to the ‘Welding’ section, page 11 and 12.10990548 40mm Flange mount tow eye10995337 50mm Flange mount tow eye10990173 50mm weld on tow eye7

Interchangeable tow eye40mm Assy Pt no. 599287750mm Assy Pt no. 59928853” Pintle Eye Assy Pt no. 47204580• Torque nut to 500Nm• Apply anticorrosive to shank and thread beforeassembly40mm Pt no. 6992013• Overall length: 525mm• Weight: 9.5kgs• Static vertical support load: 1000kgs (dependant onDc and V-value)• D-value: 125kN• DC-value: 74kN• V-value: 23kN50mm Pt no. 6992021• Overall length: 535mm• Weight: 11.1kgs• Static vertical support load: 1000kgs (dependant onDc and V-value)• D-value: 130kN• DC-value: 90kN• V-value: 25kNPintle Eye Pt no. 47204580Housing Pt no. 1636855Washer Pt no. 12991240Nut Pt no. 6997732Split pin Pt no. 129915338

Tow eye bushes40mm Pt no. TB4840mm Pt no. TB48540mm Pt no. TB4940mm Pt no. TB49540mm Pt no. TB5050mm Pt no. TB60550mm Pt no. TB6150mm Pt no. TB615• Service maintenance programmes should includeregular toweye bush replacement- reducingmaintenance cost.From NZS5446:1987 Clause: 5.5• Towing eye bushes shall be replaced only inaccordance with the manufacturer’s instructions,and shall not be retained by welding.Pt no. 10990998• Wear guage for 40mm and 50mm couplingpin and toweye bush40mm Pt no. 40MMD50mm Pt no. 50MMD• Drift for toweye bush9

Wear and testing• Upon possible damage (deformation because of accident or overuse) thedrawbar eye must be changed immediately.• Damaged or loose bushes must be exchanged in good time.• The max. wear of the inner diameter of the drawbar eye (with nominaldiameter of 40 and 50mm) is 1.5mm when using bushes.• New bushes must be mounted professionally.• Welding of bushes is not allowed.• When using drawbar eyes without bushes the max. wear of the innerdiameter is 2.5mm.• The wear of the height of the drawbar eye must not exceed 2.5mm (applyingto all designs of construction).• The tightening torque of the interchangeable drawbar eye must be checkedat least with each inspection of the vehicle.• If necessary, lubricate coupling pin and tow eye bush with oil (greasecollects road debris and accelerates wear).“Generally parts with dynamic strength of more than 30mm thickness of steelquality ST 52-3, before welding should be normalised at approx. 900degrees C, for the process of welding at approx. 250 degrees C treated andafter welding at approx. 600 degrees C annealed for releasing stresses(normalising by the manufacturer/ preheat in the welding department/annealing for releasing stresses can be cancelled without lessening thestress capacities).On welding the drawbar eye on the drawbar, the shaft of the drawbar shouldbe pre-heated with neutral Oxy-Acetylene-Flame to approx. 250 degreessC.”NZS5446:1987 Clause: 5.7• Protection for the towing eye shall be included in the drawbar design toprevent ground contact of the towing eye. Spring type drawbar support isrecommended.10

WeldingWeld-in drawbar eyes• The mounting of such drawbar eyes can be carried out by using differentwelding seams. All welding connections are to be performed according to theregulations of the manufacturers of drawbars, poles, towing rods and/orchassis and to be checked when vehicle is approved.• As minimum requirement for welding we recommend Y 42 20 (according toDIN 8559) when using inert gas, i.e. E 43 30 (according to DIN 1913) whenusing welding electrodes.• Extract of the original DIN 74053 and 74054:“Generally parts with dynamic strength of more than 30mm thickness of steelquality ST 52-3, before welding should be normalised at approx. 900 degreesC, for the process of welding at approx. 250 degrees C treated and afterwelding at approx. 600 degrees C annealed for releasing stresses(normalising by the manufacturer/ preheat in the welding department/annealing for releasing stresses can be cancelled without lessening the stresscapacities).On welding the drawbar eye on the drawbar, the shaft of the drawbar shouldbe pre-heated with neutral Oxy-Acetylene-Flame to approx. 250 degreess C.”40mm weld-in tow eye11

Welding (cont)50mm weld-in tow eyeInterchangeable tow eye12

CapacityNZS5446:1987 clause 2.3.1• An expression of loading capacity of a coupling, or towing eye derived from thegross combination mass of all vehicles in combinationNZS5446:1987• D= value in tonnes=GCM*/4• *This value to be the lesser of (a),(b),(c) below.• Gross combination mass means:• (a) The maximum sum of the axle loadings permitted by the Heavy MotorVehicle Regulations for the towing and all towed vehicles in combination, or• (b) The sum of the gross vehicle mass of each vehicle in a combination, or• (c) The vehicle manufacturer’s gross combination mass rating for a towingvehicleEC/94/20• Pelase refer to the following website caluclator for both hinged drawbar andrigid drawbar trailers:• www.ringfeder.de• Select ‘trailer coupling and system solutions’• Select ‘guidance’13

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