PSP FOR REBUILDING THE PUMP DRIVE ON CERTAIN 235B AND 235C EXCAVATORS - PS4547 - MAILED US AND CANADA, CACO, COFA, CFEL, COS A, LIMITED BRAZIL Caterpillar

U-48
A-38
AU-32
B-10.1
E-35
O-39
3108   PS4547
NOTE: 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
"PS4547" as Part Number, "7755" as Group Number, and "96" as
Description Code.
NOTE: This Program is intended to support those units which have not
experienced a reasonable pump drive life of 4000 service meter
hours or greater.
NOTE: Due to the critical nature of the rebuild procedures and the need
for special dealer tooling (4C6186 Tool Group) this rework must
be performed by dealer personnel. Customer rebuilds are not
acceptable.

March 31, 1992

The Service life of the pump drive may be shorter than desired on certain
235B and 235C Excavators. Possible problems that may shorten the service
life are the failure of the teeth on the 8K2878 Gear Assembly or failure of
the teeth on the 8K2860 Flange. A secondary problem may be failure of the
bearing for the center gear.

Model Identification Number
235B  7WC1 - 354
9PC1 - 469
1FD1 - 947
4ED1 - 650
235C  5AF1 - 686
2PG1 - 532
3WG1 - 148
4DG1 - 400

1 - 7B1480 Elbow
1 - 9C5993 Shim (Later Pumps Only)
1 - 3D3715 Cone
1 - 3D3716 Cup
1 - 5F3106 Seal
1 - 6F6740 Gasket
1 - 8F8733 Seal
2 - 9G0809 Spring
1 - 9G5127 Breather
1 - 1H5338 Cup
1 - 5H3252 Seal
1 - 2K5097 Cone
1 - 3K0360 Seal
1 - 8K2865 Shim
1 - 8K3568 Shim (Earlier Pumps Only)
4 - 1P2636 Cup
4 - 1P2662 Cone
1 - 5P3118 Seal
1 - 8R7803 Gear Assembly
1 - 8R7807 Cage (Later Pumps Only)
1 - 8R9588 Cage (Earlier Pumps Only)
2 - 7S8758 Seal
1 - 3V9014 Flange
1 - 5V5379 Bolt
1 - 6V1320 Seal (Later Pumps Only)
2 - 6V3677 Dowel
1 - 9V7575 Plate
1 - 6W1326 Spider
1 - 9X4593 Seal
26 - 6Y8842 Block
8 - 307335 Bolt
1 - 307764 Nipple
NOTE: After failure, if the case is distorted and does not meet
specifications, it will be necessary to replace the 8R7806 Case.
NOTE: The swing pump for the 235C Excavators changed effective with
2PG397-UP, 3WG75-UP, 4DG318-UP, and 5AF267-UP. Parts that apply
only to these excavators with the new swing pump are marked
(Later Pumps Only). Parts that apply only to earlier excavators
with the former type swing pump are marked (Earlier Pumps Only).
NOTE: Order appropriate pump line seals as needed. Some machines have
face-type seals which should not require changing. Do not
separate lines at joints where it is not necessary.

Order the appropriate parts and do the rework as per Special Instruction
SEHS9146, "Reworking the Hydraulic Pump Drive."
NOTE: Special Instruction SEHS9146 has been updated to include 235B and
235C Excavators.

Product Caterpillar Dealer Suggested Customer Suggested
smu/age Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
whichever (D/N) (Cost)  (C/L) (Sell)
comes
first
**** Before Failure ****
0-2000 100% 10 0 5 0 0
0-24 mo
2001-4000 33 1/3% 5 0 5 50% 5
25-48 mo
NOTE: This is a 15-hour job.
NOTE: An additional 2 hours will be allowed for dealer modification of
case. Otherwise, attach invoice from outside supplier.
**** After Failure ****
0-2000 100% 15 0 0 0 0
0-24 mo
2001-4000 33 1/3% 5 0 5 50% 5
25-48 mo
NOTE: This is a 15-hour job.
NOTE: An additional 2 hours will be allowed for dealer modification of
case. Otherwise, attach invoice from outside supplier.
NOTE: If the customer has participated in previous pump drive rebuild,
parts hours apply.

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