PRODUCT SUPPORT PROGRAM FOR INSTALLING A NEW PUMP DRIVE SHAFT SEAL ON CERTAIN M312, M315, M318, AND M320 WHEELED EXCAVATORS Caterpillar


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


 
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
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 "PS50386" 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.

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, 2004

PROBLEM

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

Model Identification Number
M312 6TL1-1717
M315 7ML1-2740
M318 8AL1-3314

6ES1-301

8SS1-617

M320 6WL1-908

9PS1-458

PARTS NEEDED

Model Part Number
M312 2216815 Cover Kit
M315/M318 2216816 Cover Kit
M320 2216817 Cover Kit
NOTE: If dealer stock contains the following parts, and the main pump shaft has not been damaged by the seal, the seal kits identified in the following table can be exhausted.
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

Product smu/age whichever comes first
Caterpillar
Dealer Suggested
Customer Suggested
Parts
Labor Hrs
Parts
Labor Hrs
Parts
Labor Hrs
0-6000
0-60 mos
100%
*
0
0
0
0
NOTE: *This is a 5.0?hr job for the M315/M318/M320. This is a 6.0-hr job for the M312.

PARTS DISPOSITION

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

Attach. (1-Rework Procedure)

Rework Procedure

  1. Remove swing pump according to the Disassembly and Assembly manual for each model.
  2. 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.
  3. Remove shaft snap-ring, seal cover, and shaft seal. (See Fig 1)
  4. 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.
  5. 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)
  6. Re-install shaft snap ring.
  7. Clean pump face, and engine flywheel housing.
  8. Re-install main pump.
  9. Remove snap ring located inside the pump shaft coupling. Note: Not all couplings will have a snap ring.
  10. Install shaft coupling to main pump shaft.
  11. 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.
  12. Insert new spring (supplied in kit) into new bushing as shown.
  13. Re-Install swing pump.
Fig 1


Fig 2

 

Fig 3

Seal Orientation Detail

NOTE: The seal will leak if not properly oriented.

Caterpillar Information System:

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