SENSOR GP-PRESSURE 3447389 - Caterpillar

TEBE0326-00
27Sep2013
U-454
A-312
D-377
O-381
Before/After
PRODUCT SUPPORT PROGRAM FOR REPLACING THE INTERNAL SUPPORT DISC WITHIN THE DIESEL EXHAUST FLUID BACK PRESSURE VALVE ON CERTAIN RETROFIT SELECTIVE CATALYTIC REDUCTION SYSTEMS
108H 108K PS44031
This Program must be administered either before or after failure.In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS44031" as the Part Numberand "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and "T" as the SIMS Description code.If administered after failure, use "96" as the Warranty Claim Description Code, and "Z" as the SIMS Description Code.
The information supplied in this service letter may not be valid after the termination date of this program.Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
TERMINATION DATE
30Sep2015
PROBLEM
The existing internal support disc within the Diesel Exhaust Fluid Valve on certain Retrofit Selective Catalytic Reduction Systems can fail. If the existing internal support disc fails, the Diesel Exhaust Fluid Valve can/will over dose SCR chamber with Diesel Exhaust Fluid and the system will not operate as designed.
AFFECTED PRODUCT
Model Identification Number
AFTERTREAT-SCR ES700101, 105-170, 231-259, 266-273
PARTS NEEDED
Qty
Part Number Description
1 4487104 DISC-SUPPORT
In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 32% of dealership population. This is an initial order recommendation only, and the ultimate responsibility for ordering the total number of parts needed to satisfy the program lies with the dealer.
ACTION REQUIRED
Prior to Disassembly:
Remove/Turn off all power to the dosing cabinet.
Lock Out and Tag Out the master disconnect.
Follow all mandated safety rules.
Please refer to the attached Rework Procedure.
SERVICE CLAIM ALLOWANCES
Product smu/age whichever comes first Caterpillar Dealer Suggested Customer Suggested
Parts % Labor Hrs% Parts % Labor Hrs% Parts % Labor Hrs%
0-8000 hrs,
0-24 mo 100.0% 100.0% 0.0% 0.0% 0.0% 0.0%
This is a 2.0-hour job
PARTS DISPOSITION
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Rework Procedure
Early production dosing cabinets under went several changes with the Diesel Exhaust Fluid Back Pressure Valves that were installed at the factory. (A) Plastic Housing, (B) Stainless Steel Housing, and (C) Stainless Steel Body with Plastic Cap. Refer Image 1.1.1.
Identify the Diesel Exhaust Fluid Back Pressure Valve in the dosing cabinet, and proceed to the appropriate rework procedure below.
Remove the Diesel Exhaust Fluid Back Pressure Valve from dosing cabinet. Refer to Image 1.1.2.
Disassemble and replace the internal support disc. Refer to Image 1.1.3.
Reassemble valve and tighten the assembly screws 5 Nm ( 43 in lb ). Reinstall valve into dosing cabinet.
Once Diesel Exhaust Fluid Back Pressure Valve has been reinstalled, it is necessary
to set the back pressure valve at ~40 psi. This is an important adjustment. If the back pressure valve is set too low it will not be able to seal against the DEF head pressure, and can flood the reactor. If the valve is set two high, it can stop all flow of DEF, and will force DEF out the pump pressure