PRODUCT SUPPORT PROGRAM FOR INSTALLING A NEW PUMP DRIVE SHAFT SEAL ON CERTAIN M312, M315, M318, AND M320 WHEELED EXCAVATORS
Usage:
SEBE8042
July 2, 2002
U-149
A-110
AU-109
S-109
H-107
O-123
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After failure only | PRODUCT SUPPORT PROGRAM FOR INSTALLING A NEW PUMP DRIVE SHAFT SEAL ON CERTAIN M312, M315, M318, AND M320 WHEELED EXCAVATORS | |
5058 |
PS50386
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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.
TERMINATION DATE
July 31, 2004PROBLEM
Axial movement of the main pump shaft against the 6E1572 shaft seal causes main pump leaks. Main pump leaks due to this cause will be noticed on the engine flywheel housing.AFFECTED PRODUCT
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Model | Identification Number |
M312 | 6TL1-1717 |
M315 | 7ML1-2740 |
M318 | 8AL1-3314
6ES1-301 8SS1-617 |
M320 | 6WL1-908
9PS1-458 |
PARTS NEEDED
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Model | Part Number |
M312 | 2216815 Cover Kit |
M315/M318 | 2216816 Cover Kit |
M320 | 2216817 Cover Kit |
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Model | Part Number |
M312 | 1943961 Seal Kit |
M315/M318 | 1943963 Seal Kit |
M320 | 1943964 Seal Kit |
ACTION REQUIRED
Main Pump leaks can be resolved with the installation of the kit specified for each model. The kit contains components that include new seals, a new offset cover, and a spring/sleeve that preloads the shaft to prevent axial movement. Please note the attached Rework Procedure.SERVICE CLAIM ALLOWANCES
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Product smu/age whichever comes first |
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0-60 mos |
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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
- Remove swing pump according to the Disassembly and Assembly manual for each model.
- Remove Main Pump according to the Disassembly and Assembly manual for each model. Set Main Pump on end, with shaft pointing up, to ease serviceability.
- Remove shaft snap-ring, seal cover, and shaft seal. (See Fig 1)
- Clean the pump shaft in the seal location. Note: If the shaft surface is not free of debris in the seal location, the seal will not function properly.
- Install new o-ring, shaft seal, and seal cover (all supplied in the kit), specified for each model. As seal orientation is critical, note seal orientation detailed below. (Fig. 3)
- Re-install shaft snap ring.
- Clean pump face, and engine flywheel housing.
- Re-install main pump.
- Remove snap ring located inside the pump shaft coupling. Note: Not all couplings will have a snap ring.
- Install shaft coupling to main pump shaft.
- Insert new bushing (supplied in kit) into shaft coupling as shown in Fig. 2. Note: If snap ring is not removed in step 9, the new bushing cannot be properly installed.
- Insert new spring (supplied in kit) into new bushing as shown.
- Re-Install swing pump.
Fig 2
Fig 3
Seal Orientation Detail
Caterpillar Information System:
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