Usage:
November 13, 2001
(Revised February 2002)
U-310
A-216
AU-205
S-155
H-114
O-237
| before
or
after failure |
PRODUCT SUPPORT PROGRAM FOR REPAIRING THE IMPLEMENT PUMP THAT MAY EXPERIENCE CAVITATION AND AERATION FAILURES ON CERTAIN 980G WHEEL LOADERS |
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| 5073II 5073HFN 1387GT 5084GT |
PS40769
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NOTE: 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.
NOTE: This Revised Service Letter replaces the November 13, 2001 Service Letter. Changes have been made to the Affected Product.
TERMINATION DATE
November 30, 2003PROBLEM
The vane-type implement pump has experienced cavitation and aeration failures on certain 980G Wheel Loaders. These failures have occurred at both low and higher hours. A new gear-type pump should be installed.AFFECTED PRODUCT
| Model | Identification Number |
| 980G |
9CM1-1759 2SR1-820 |
PARTS NEEDED
1 - 3D2824 Seal - O-Ring18 - 5D4177 Hose (bulk cm)
1 - 3E2345 Tee - 0-Ring
1 - 5F3106 Seal - O-Ring
1 - 4J0524 Seal - O-Ring
2 - 3K0360 Seal - O-Ring
11 - 5K0309 Hose (bulk cm)
1 - 9M2092 Seal - O-Ring
2 - 1P3705 Seal - Rectangular
1 - 1P3707 Seal - Rectangular
2 - 1P4579 Flange - Half
2 - 5P0597 Clamp - Hose
2 - 5P8077 Flange - Half
1 - 7S8920 Clip
1 - 7S8921 Clip
4 - 8T4140 Bolt
4 - 8T4193 Bolt
4 - 8T4223 Washer - Plate
4 - 8T4956 Bolt
1 - 6V3551 Seal - O-Ring
2 - 6V4248 Bolt
5 - 6V9746 Seal
1 - 6V9839 Tee - Swivel
2 - 6V9877 Elbow - 90 Degree
4 - 7X2556 Bolt
2 - 9X2201 Clamp - Hose
12 - 9X8257 Washer
1 - 1700635 Hose As.
1 - 1910135 Pump Group
1 - 1933983 Tube As.
1 - 1966852 Pump Group
1 ? 1994144 Tube As.
1 ? 1994145 Tube As.
1 ? 1996251 Hose As.
1 ? 1996252 Hose As.
1 ? 1996253 Hose As.
ACTION REQUIRED
A failed implement pump should be examined for evidence of aeration or cavitation. For implement pump cartridge(s), this would include rippling of the cam ring or smearing of the pressure plates. Other failure modes include cracking of the rotor within the cam ring.After completing hardware installation, proper priming of the replaced pump should be performed. Additionally, do not run the machine up to high idle relief settings until confidant that complete fill and air removal has occurred in the hydraulic system.
See the attached Rework Procedure.
SERVICE CLAIM ALLOWANCES
Implement pump hours |
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NOTE: To compensate for machines that have experienced an implement pump failure in the past, this program is based on the hours currently on the implement pump when the service letter is applied. |
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PARTS DISPOSITION
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.Attach. (1-Rework Procedure)
Rework Procedure
After completing hardware installation, proper priming of the replaced pump should be performed. Additionally, do not run the machine up to high idle relief settings until confidant that complete fill and air removal has occurred in the hydraulic system.
- Remove and discard the implement pump and fan pump stack from the machine. Please reference SENR5885 Disassembly and Assembly instructions for pump removal.
- Remove and replace the corresponding suction line parts (fan inlet tube assembly, implement inlet tube assembly), pump outlet lines and fan pump drain line. Reference Illustration 1 for routing. Use new hardware as provided.
- Assemble the new pump stack consisting of 1910135 Implement pump and 1966852 Fan Pump as shown in Illustration 2.
- Install the pump stack assembly into the machine. NOTE: The torque for the hose and suction lines to the fan pump is critical and should not be over tightened, pump distortion is possible if any connection to the fan pump is over tightened. Install fan pump fittings with 50 +/- 10 N.m (37 +/- 7.4 ft-lbs.).
- Refill the hydraulic tank to the full mark on level ground and check for leaks.
Illustration 1
Illustration 2