Usage:
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 "PS4758" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
NOTE: Although this Program is to be administered as described above on the Affected Product, parts should be removed from Parts Stock as soon as possible.
Termination Date
March 31, 2000Problem
The relief valve poppet can become dislodged and unseated in the 1184295 Unloading Relief Valve for the steering circuit on certain stic steer 988F II Wheel Loaders. This condition can allow the steering cylinders to be sluggish and or slow to respond. A new design 1714444 Relief Valve prevents the poppet from being unseated.
Affected Product
Model & Identification Number
988F (2ZR147-150, 2ZR152-172, 2ZR174-180, 2ZR183-215, 2ZR217-285, 2ZR287-292, 2ZR294-349, 2ZR351-368, 2ZR370-444, 2ZR446-455, 2ZR457, 2ZR460-461, 2ZR463-466, 2ZR468-469, 2ZR471, 2ZR473-493, 2ZR495-506, 2ZR508-519, 2ZR521-588, 2ZR590-600, 2ZR602-614, 2ZR616-618, 2ZR620, 2ZR622-638, 2ZR640-643, 2ZR645-659, 2ZR661-669, 2ZR672-706, 2ZR708-751, 2ZR753-767, 2ZR769-770, 2ZR772, 2ZR774-825, 2ZR827-886, 2ZR888, 2ZR890-902, 2ZR904, 2ZR906-941, 2ZR943-944, 2ZR946-951, 2ZR953-961, 2ZR963-965, 2ZR967-972, 2ZR974-976, 2ZR978-983, 2ZR985-988, 2ZR990-991, 2ZR993-995, 2ZR997-998, 2ZR1000, 2ZR1002-1006, 2ZR1008-1011, 2ZR1014-1016, 2ZR1020, 2ZR1022, 2ZR1024-1025, 2ZR1029, 2ZR1031-1032, 2ZR1034-1035, 2ZR1037-1038, 2ZR1040-1043, 2ZR1046-1048, 2ZR1050-1054, 2ZR1056-1057, 2ZR1059-1062, 2ZR1064-1066, 2ZR1068-1071, 2ZR1073-1075, 2ZR1077-1080, 2ZR1082-1108, 2ZR1110-1112, 2ZR1114, 2ZR1117-1142, 2ZR1144-1170, 2ZR1172-1237, 2ZR1239-1241, 2ZR1243-1245, 2ZR1247-1279, 2ZR1281-1286, 2ZR1288-1289, 2ZR1291-1292, 2ZR1294-1297, 2ZR1299-1301, 2ZR1303-1306, 2ZR1308, 2ZR1310-1312, 2ZR1314-1319, 2ZR1322-1329, 2ZR1331-1369, 2ZR1371-1646)
Parts Needed
- 1 - 1714444 Relief Valve
Action Required
Effected Products
See the attached rework procedure.
Parts Stock
Remove all 1184295 Relief Valves from Parts Stock.
Parts Stock
Submit one claim for all 1184295 Relief Valves removed from Parts Stock.
Service Claim Allowances
NOTE: This is a 1-hour job.
NOTE: This coverage is for SMU or since last replacement failure.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach.
- (1-Rework Procedure)
Rework Procedure
Service Manual Module , SENR5737 Service Manual Module, SENR5731 Service Manual Module, SEBU64661. Lower the bucket of the machine to the floor or ground.
2. Connect the steering frame lock link. See the topic "Separate and Connect Steering frame Lock Link", page 4 in Service Manual Module, SENR5737.
3. Engage the parking brake.
4. Release the pressure in the hydraulic system as follows:
a. Move the lift control lever to the "FLOAT" position.
b. Shut off the engine.
c. Move the lift control lever to the "HOLD" position.
d. Carefully loosen the filler cap on the hydraulic oil tank to release the pressure.
Containing Fluid Spillage:
NOTE: Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools And Shop Products Guide" for tools and supplies suitable to collect and contain fluids in Caterpillar machines.
1. Dispose of all fluids according to local regulations and mandates.
2. Install a vacuum on the hydraulic tank to prevent severe loss of oil.
3. Open the panel over the steering control valve.
4. Remove the 1184295 Relief Valve from the 1184297 Valve Group and replace with the new 1714444 Relief Valve.
5. Refill the hydraulic oil tank with oil to the correct level. See Service Manual Module, SEBU6466, page 117-118, Operation and Maintenance Manual, 988F Wheel Loader, for the correct filling procedures.
6. Separate the steering frame lock link. See the topic "Separate and Connect Steering Frame Lock Link" in Service Manual Module, SENR5737.
7. Start the machine, and check the operation of the steering. Reference pages 30-32 "Performance Test" in Service Manual Module, SENR5731.