ROUTINE

ROUTINE
MWO effective date is 04 Jan 99 and completion date is 31 Dec 2003
MODIFICATION WORK ORDER
MWO 3-4230-228-20-1
MODIFICATION OF THE DECONTAMINATING APPARATUS: POWER
DRIVEN, LIGHTWEIGHT,
M17 LDS NSN 4230-01-251-8702
M17A1 LDS NSN 4230-01-303-5225
M17A2 LDS NSN 4230-01-346-1778
M17A3 LDS NSN 4230-01-346-3122
Headquarters, Department of the Army, Washington, D.C.
Current as of 8 January 1999
REPORTING ERRORS AND RECOMMENDING IMPROVEMENT
You can help improve this MWO. If you find any mistakes or if know of a way to improve these
procedures, please let us know. Write a letter or complete and mail a DA Form 2028,
Recommended Changes to Publications and Blank Forms, to Soldier and Biological Chemical
Command, ATTN: AMSSC-HB-DMT (RI), Rock Island, IL 61299-7390. A reply will be provided to
you.
DISTRIBUTION STATEMENT C: Distribution authorized to U.S. Government agencies and their
contractors in order to protect information and technical data developed by government agencies
and their contractors that address current technology in areas of potentially significant military
application. This determination was made on 7 July 1987. Other requests for this document will
be referred to Soldier and Biological Chemical Command, ATTN: AMSCC-HB-DMT (RI), Rock
Island, IL 61299-7390.
WARNING: This document contains technical data whose export is restricted by the Arms Export
Control Act (Title 22,U.S.C., SEC 2751 et seq.) or The Export Administration Act of 1979, As
Amended (Title 50, U.S.C., APP 2401 et seq.). Violations of these export laws are subject to
severe criminal penalties.
HANDLING AND DESTRUCTION NOTICE: Comply with distribution statement and destroy by
any method that will prevent disclosure of contents or reconstruction of the document.
1. PURPOSE: The purpose of this modification is to add a shut-off gate valve to the siphon
injector assembly of the M17 Series Decontamination System. With the shut-off valve installed,
the injector can be turned off to stop any unwanted siphoning flow from the water source
between wash operations. Besides the waste of water, the operator had to also elevate the
injector assembly above the height of the water source to keep the water from flowing out of the
injector assembly. The installed gate valve will allow the operator to lay the injector assembly on
the ground in the wash area between operations, saving both time and water.
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MWO 3-4230-228-20-1
2. PRIORITY: This modification is classified ROUTINE.
3. END ITEM OR SYSTEM TO BE MODIFIED: See below.
M17 Lightweight Decontamination System (LDS) NSN 4230-01-251-8702
M17A1 LDS NSN 4230-01-303-5225
M17A2 LDS NSN 4230-01-346-1778
M17A3 LDS NSN 4230-01-346-3122
NOTE
This MWO shall not be applied to A/E32U-8 Decon System NSN 4230-01-153-
8660.
4. MODULE(S) (COMPONENTS, ASSEMBLIES, SUBASSEMBLIES) TO BE MODIFIED:
The following items, whether installed or in PLL/ASL or depot stock, shall be modified.
NOMENCLATURE NSN CAGEC PART NUMBER
Injector Assembly 4230-01-295-2443 81361 5-45-4918
Injector Assembly is one of the components located in the Accessory Box Part Number 5-45-
4950.
5. PARTS TO BE MODIFIED: Not applicable.
6. APPLICATION:
a. Time Compliance Schedule: This MWO is effective 04 Jan 1999 and the completion date
is 31 Dec 2003.
b. Level of Maintenance: Unit Maintenance personnel are authorized to apply this MWO with
MOS’s of 54B or 63J.
c. Application Time: The total man-hours required for a single application of this MWO is
0.33 hours.
d. This MWO does not effect any other MWO or upgrade.
7. TECHNICAL PUBLICATIONS AFFECTED/CHANGED: TM 3-4230-228-10 with Changes 1-
5 and TM 3-4230-228-23&P with Changes 1-2. Both TM’s will be updated to show and explain
the function of the new gate valve on the Injector Assembly and to add the new parts to the
Repair Parts and Special Tools List (RPSTL).
8. MWO KIT(S)/PARTS(S) AND THEIR DISPOSITION:
a. Kit(s)/Part(s) Needed to Apply the MWO:
NOMENCLATURE CAGEC PART NUMBER QTY FIG 3,ITEM No.
Adapter, 0.75-in. Female, 45332 RL-01642827 1 3
BSPP to 0.75-in. Male NPT
Gate Valve 0.75-in. NPT 12168 T113 1 4
Coupling Half, 96906 MS27022-4 1 5
Quick Disconnect
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MWO 3-4230-228-20-1
b. Bulk And Expendable Material:
NOMENCLATURE NSN CAGEC PART NUMBER UNIT OF ISSUE
Sealant, Thread 8030-01-063-7510 81349 MIL-S-46163,TY I,GR L AR
Or Alternate Loctite Thread Locking Compound Adhesive/Sealant No. 277
c. Parts Disposition: Disposition of excess parts will be IAW AR 710-2, AR 735-5 and local
policy.
9. SPECIAL TOOLS; TOOL KITS; JIGS; TEST,MEASUREMENT AND DIAGNOSTIC
EQUIPMENT (TDME); AND FIXTURES REQUIRED:
Bench Vise with soft jaws or protective jaw covers.
12-inch Crescent Wrench
14-inch Pipe Wrench
1-1/8 inch Open End Wrench
1-5/16 inch Open End Wrench
10. MODIFICATION PROCEDURES:
NOTES
For ease of disassembly and assembly, the nonmetallic tubing could be
removed from the ball valve by loosening the hose clamp and removing the
nonmetallic tubing.
M17 series Decon Systems have been produced with two different
configurations of the Injector Assembly. In the following disassembly
instructions, please refer to either Figure 1 or Figure 2 that corresponds with
your Injector Assembly.
a. Disassembly
(1) Mount the Injector Assembly in the Bench Vise by gripping the square center block (Item 1)
in the vise jaws. Allow the steel adapter (Item 3) and quick disconnect coupling half (Item 4)
or just the quick disconnect coupling half on some models (Item 3) to clear the vise jaws.
CAUTION
Injector assembly components can be very tight and difficult to remove due to
the thread sealing compound. To avoid injury, ensure the Pipe Wrench does not
slip off during use.
(2) Use a 1-1/8 inch wrench to support the nozzle (Item 2) that threads into the back of the
square block (Item 1).
NOTE
Nozzle must be supported to keep it from being removed from the square block
of the Injector Assembly during the following step.
(3) With the nozzle being held in place by the 1-1/8 inch wrench, use a pipe wrench to grip and
remove the steel adapter (Item 3) and quick disconnect coupling half (Item 4) or remove the
quick disconnect coupling half (Item 3) from the nozzle (Item 2). Clean all sealing compound
from the nozzle threads.
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MWO 3-4230-228-20-1
10.MODIFICATION PROCEDURES: (Cont)
b. Assembly
NOTE
The Brass Adapter, Gate Valve and Quick Disconnect Coupling Half are shipped
together as a hand tighten assembly. Remove from the packaging and
disconnect the three parts.
Refer to Figure 3 for the following assembly instructions.
(1) Apply a thin film of Sealing Compound (MIL-S-46163,TY I,GR L or alternate) to the male
nozzle threads (Item 2) of injector and thread on the new brass adapter (Item 3) until the end
of the threads stops assembly.
(2) Use the Crescent wrench to tighten the new adapter (Item 3) onto the nozzle (Item 2).
(3) Remove the injector assembly from the bench vise jaws and set aside.
(4) Mount the new quick disconnect coupling half (Item 5) in the bench vise, so that the jaws
clamp across the hex flats with the NPT threads facing outwards.
(5) Apply a thin film of sealing compound (MIL-S-46163,TY I,GR L or alternate) to the male
threads of the quick disconnect coupling half (Item 5) and thread on the new 0.75-in NPT
gate valve (Item 4) until the end of the threads stops assembly.
CAUTION
Tighten the gate valve by using the hex flats closest to the coupling half.
Tightening the gate valve from the hex flats opposite the coupling half may
cause damage to the valve by crushing hex flats and deforming the valve
threads.
(6) Use a 1-5/16 inch wrench on the gate valve (Item 4) hex flats closest to the quick disconnect
coupling half (Item 5) and tighten.
(7) Remove the quick disconnect coupling half and gate valve assembly from the bench vise
and mount the Injector Assembly in the vise jaws by gripping the square center block (Item
1).
(8) Apply a thin film of sealing compound (MIL-S-46163,TY I,GR L or alternate) to the male
threads of the new brass adapter (Item 3) and thread on the new 0.75-in NPT gate valve
(Item 4) and quick disconnect coupling half (Item 5) assembly until the end of the threads
stops assembly. Tighten and position the gate valve (Item 4) handle 90 degrees to the upper
siphon ball valve and nonmetallic hose (or hose adapter if nonmetallic hose was removed)
as shown in Figure 3. Remove the assembly from the bench vise and allow the assembly to
set for 48 hours to cure the sealing compound.
(9) If nonmetallic hose was removed, install the hose to the hose adapter using the hose clamp.
11. CALIBRATION REQUIREMENTS: Not applicable.
12. WEIGHT AND BALANCE DATA: Weight and balance are not significantly affected.
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MWO 3-4230-228-20-1
13. QUALITY ASSURANCE REQUIREMENTS: Refer to Operator’s TM 3-4230-228-10 and test
the injector assembly for leaks. Connect injector assembly to your M17 LDS and perform a spray
mission with COLD water. Look for leaks around the thread connections. Test the gate valve for
leaks by turning off the M17 LDS, close the injector gate valve, lay the injector on the ground
and again look for leaks around the threaded connections. If a leak is found, disassemble the
leaking thread joint, clean, reapply sealing compound and retest.
14. RECORDING AND REPORTING OF THE MODIFICATION: Record and report
accomplishment of this modification in accordance with DA PAM 738-750, The Army
Maintenance Management System (TAMMS). DA Form 2407 shall be completed and submitted
within 3 days of accomplishment of modification. After completion, copies of DA Form 2407 will
be distributed as follows:
a. Copy 1: Retained by using unit.
b. Copy 2: Commander
US Army Soldier and Biological Chemical Command
ATTN: AMSSC-HB(RI) MWO Office
Rock Island, IL 61299-7390
15. MATERIAL CHANGE (MC) NUMBER: This MWO is authorized by MC No. 1-96-08-8001.
16. MODIFICATION IDENTIFICATION: Modified Injector Assembly can be identified by the
mounted 0.75-in. NPT Gate Valve with a circular on-off handle.
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MWO 3-4230-228-20-1
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MWO 3-4230-228-20-1

MWO 3-4230-228-20-1
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05667
To be distributed in accordance with initial distribution number
(IDN) 280854, requirements for MWO 3-4230-228-20-1.

077099-000

PIN 077099-000