PSP FOR FUEL TRANSFER PUMP VALVES; 3406B TRUCK, MARINE, INDUSTRIAL, MARINE, GENERATOR SET ENGINES; 16G MOTOR GRADERS; 245 EXCAVATORS AND FRONT SHOVELS; 824C TRACTORS, 825C 826C COMPACTORS; 980C LOADERS - MAILED US AND CANADA, CFEL, COSA A, CFEL, COS Caterpillar

PRODUCT SUPPORT PROGRAM FOR FUEL TRANSFER PUMP VALVES; 3406B TRUCK, MARINE,
INDUSTRIAL, GENERATOR SET ENGINES; 16G MOTOR GRADERS; 245 EXCAVATORS AND FRONT
SHOVELS; 824C TRACTORS, 825C, 826C COMPACTORS; 980C LOADERS, 1256, PS4021
U-27
C-26
E-21
O-22
NOTE: This Service Letter replaces the October 4, 1985 Service Letter. Cross
out the October 4, 1985, Service Letter and refer to this Service Letter.
This Program can be administered either before or after a failure. In either
case the decision whether to apply the Program is made by the dealer. When
reporting the repair, use "PS4021" as Part Number and "7755" as Group Number.
Although products in the field are to be administered as described above,
dealers should purge parts stock immediately.
A Service Letter similar to this one has been sent to all TEPS Dealers.

April 30, 1987

The fuel transfer pump on the above engines has three-1W6182, 7W402 or 7W8412
Valve Assemblies. The valve in the piston can fail, and some damage can also
occur to the other valve assemblies. The problem with the 1W6182 and 7W402
Valve Assemblies has been reported mainly in cold weather applications. The
problem with the 7W8412 Valve Assembly is related to hot fuel.
New improved valves are now used in the piston and at the other two locations
in the pump. These valves are directly adaptable to earlier engines.

NOTE: Products fixed with earlier 7W8412 Valves (black discs) are eligible for
this Program with new parts.
Some of the following vehicles contain the 3406 Engine with the former scroll
fuel system and are not in the Program.
Model  Identification Number
3406B Truck Engine 7FB1-56107
3406B Marine Engine  4TB1-800
3406B Industrial Engine 6TB1-3011
3406B Generator Set  2WB1-3251
16G Motor Grader  93U2284-2598
245 Excavator  95V1084-1228
94L525-773
245 Front Shovel  82X618-646
84X686-908
621B Tractor 2GB124
45P3521, 3523-3920
623B Tractor 46P1957, 1971-2299
627B Tractor 14S1188, 1191, 1212, 1220,
1237, 1252, 1253, 1267,
1277, 1290
15S1726
824C Tractor 85X958-1202
825C Compactor 86X634-734
826C Compactor 87X338-598
980C Loader  63X4923, 4929, 4933-6722
2EB367-379
13B373-619

1 - 7C396 Spacer 1 - 6F6672 Seal
1 - 3D2824 Seal 1 - 6J2419 Seal
1 - 3D2898 Seal 1 - 5P8215 Seal
1 - 4J8997 Seal 3 - 7W8412 Valve As. (blue or white)

Parts Action
Remove all 1W6182 or 7W402 Valve Assemblies from parts stocks. Also remove all
7W8412 Valve Assemblies with black discs from parts stocks. (All packages with
date codes before 3/86.) See the illustration. The new 7W8412 Valve Assembly
has either blue or white disc material. Be sure to use the 7C396 spacer (Blue)
with the new valve. The new valve is thinner and requires the new, thicker
spacer. Do not use any former 4W6908 Seals or 7W801 Spacers in 3406B Engine
applications.
Rework 1W1700 Transfer Pump Groups in your parts stock and stamp an "0" on the
pump mounting flange. Dealers should rebuild a few transfer pumps to be used
as exchange pumps.
(SEE ILLUSTRATION) Affected Product
Before work is started, see if an "O" or an "O" around an "X" is stamped on the
outer rear face of the transfer pump mounting flange near the short mounting
bolt. This identification means that the pump has been reworked at the factory
or by another dealer.
If the affected product does not have a reworked transfer pump, install a
transfer pump that has all the new parts on the affected product.
Make sure an "O" is stamped on pump mounting flange.
NOTE: Some failure modes are aggravated by high fuel temperature. It is
suggested that fuel heater usage be investigated and customers reminded that
fuel heaters should be turned off as warm weather approaches. Lower fuel
temperatures also are beneficial to engine performance and fuel consumption.
WARRANTY ALLOWANCES
* Caterpillar Dealer Suggested Customer Suggested
Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
(D/N) (Cost) (C/L) (Sell)
100% 1 0 0 0 0
* If OEM, parts are at C/L and labor at the sell rate.
NOTE: This is a 0.5 hour job to replace the transfer pump, but the allowance
includes an additional 0.5 hour for rebuilding the pump.
Because of the low dollar value of the parts and labor for each engine to be
modified, the following claim procedure can be used for this Program.
A consolidated claim may be submitted for up to ten reworked engines. Fill out
the heading information for one PIN (S/N) with hours or miles at the time of
rework in the "Comment Section" of the claim. Make a SIMS report for each PIN
(S/N) on the claim and indicate in the claim comments "SIMS Entry Made For ALL
PIN's (S/N)".
In the "Other Expenses" section of the claim, list total parts cost. In the
"Authorized Labor" section of the claim, list total labor cost.

Handle the parts in accordance with your Warranty Bulletin on warranty parts
handling.