PRODUCT SUPPORT PROGRAM FOR REPLACING THE 247-4930 LIFT CYLINDER PISTONS ON CERTAIN 993K WHEEL LOADERS
Usage:
REBE7553-01
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| 04Nov2011 |
| (Revised 11Nov2011) |
U-487
A-399
D-429
O-431
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| After Failure Only | PRODUCT SUPPORT PROGRAM FOR REPLACING THE 2474930/">247-4930 LIFT CYLINDER PISTONS ON CERTAIN 993K WHEEL LOADERS |
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| 5102 | PS52122 |
|
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| NOTE: | This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS52122" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code. |
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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. |
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| NOTE: | This Revised Service Letter replaces the 04Nov2011 Service Letter. Changes have been made to the Affected Product. |
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TERMINATION DATE |
| 30Nov2013 |
PROBLEM
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| The 2474930/">247-4930 Lift Cylinder Piston can become stuck on the 308-7748 Rod Assembly and/or crack on certain 993K Wheel Loaders. If the existing 2474930/">247-4930 Lift Cylinder Piston gets stuck on the rod it can become difficult to remove. If the 2474930/">247-4930 Lift Cylinder Piston cracks, it can cause loss of lift function and major contamination throughout the machines' hydraulic circuit. Image2 shows the piston which used a smaller radius. Image3 shows the new piston with the increased radius. |
AFFECTED PRODUCT
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| Model | Identification Number |
| 993K | LWA00421-00429 Z9K00269-00362 |
PARTS NEEDED
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Qty |
Part Number | Description |
| 1 | 7X4756 | SEAL |
| 1 | 8T6749 | RING-WEAR (HEAD) |
| 1 | 1577244 | RING-BACKUP |
| 1 | 1921455 | SEAL ASSEMBLY |
| 1 | 2299443 | RING-WEAR |
| 1 | 2474930 | PISTON |
| 1 | 3087784 | ROD AS. |
| 1 | 3206169 | SEAL-O-RING |
| 1 | 3465190 | SEAL-U-CUP SPRG |
| 1 | 3469380 | SEAL AS-BUFFER |
| 1 | 3469382 | SEAL-WIPER |
| In order to allow equitable parts availability to all participating dealers, please limit your initial parts order to not exceed 3% 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
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| A new 2474930/">247-4930 Lift Cylinder Piston with increased radius at the Piston/Rod shoulder and an improved manufacturing procedure at the assembly facility for the 2474930/">247-4930 Lift Cylinder Piston/Rod Assembly has been introduced. Refer to Image3. If the 2474930/">247-4930 Lift Cylinder Piston is seized, or cracked, it is recommended that the affected lift cylinder be removed by the dealer following the guidelines published in KENR5832, Disassembly and Assembly. The cylinder must then transported to the dealer hydraulic repair facility. Referring to KENR5832, Disassembly and Assembly, the dealer should disassemble the cylinder and remove the 2474930/">247-4930 Lift Cylinder Piston. Following the ?Salvage and Re-Use Guidelines for Caterpillar Hydraulic Cylinders?, and REHS2689, Special Instruction, "Hydraulic Cylinder Honing", the cylinder components should be inspected, replacing the existing 2474930/">247-4930 Lift Cylinder Piston with a new 2474930/">247-4930 Lift Cylinder Piston purchased through the Caterpillar Global Distribution Network. The new lift cylinder pistons have the improved radius, and any other components as required. The cylinder can now be reassembled and installed on the machine. |
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 |
| Image1 |
 |
| Image2 |
 |
| Image3 |
SERVICE CLAIM ALLOWANCES
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0-12 mo |
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13-24 mo |
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| NOTE: This is a 16.0-hour job | ||||||
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PARTS DISPOSITION
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| Handle the parts in accordance with your Warranty Bulletin on warranty parts handling. |
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