PRODUCT SUPPORT PROGRAM FOR INSTALLING A NEW PUMP DRIVE SHAFT SEAL AND IMPROVED CASE DRAIN LINES ON CERTAIN M300 WHEELED EXCAVATORS
Usage:
SEBE9080-02
February 25, 2005
(Revised September 2006)
U-58
A-43
D-49
O-51
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| After failure only |
PRODUCT SUPPORT PROGRAM FOR INSTALLING A NEW PUMP DRIVE SHAFT SEAL AND IMPROVED CASE DRAIN LINES ON CERTAIN M300 WHEELED EXCAVATORS |
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| 5058 5057 5070 |
PS50916
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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 February 25, 2005 Service Letter (Revised September 2006). Changes have been made to the Parts Needed section.
TERMINATION DATE
- February 28, 2007
PROBLEM
- Numerous root causes for main pump shaft leakage have been identified and eliminated for production machines. In addition to the handling of the pumps and cleansing before assembly, an improved pump case drain line routing has been developed to reduce the case drain back pressure. This reduces premature wear of the seal lip surface.
AFFECTED PRODUCT
***Group 1***
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| Model | Identification Number |
| M312 | 6TL1-99999 |
- ***Group 2***
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| Model | Identification Number |
| M315 | 7ML1-99999 |
- ***Group 3***
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| Model | Identification Number |
| M318 | 8AL1-99999
6ES1-99999 8SS1-99999 |
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| Model | Identification Number |
| M320 | 6WL1-99999
9PS1-99999 |
- PARTS NEEDED
- ***Group 1***
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Qty |
Part Number |
Description |
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Seal O-Ring |
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Seal O-Ring |
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Filter AS |
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Hose AS |
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Seal O-Ring |
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Tee-Swivel |
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Connector-Seal |
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Seal O-Ring |
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Hose AS |
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Connector |
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6V5203 |
Ring-Retaining |
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Shaft |
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Seal-Shaft |
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Seal O-Ring |
- ***Group 2***
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Qty |
Part Number |
Description |
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Seal O-Ring |
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Seal O-Ring |
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Filter AS |
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Hose AS |
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Seal O-Ring |
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Tee-Swivel |
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Connector-Seal |
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Seal O-Ring |
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Hose AS |
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Seal O-Ring |
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6E1572 |
Seal Shaft |
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Ring |
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Seal |
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Shaft GP |
***Group 3***
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Qty |
Part Number |
Description |
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Seal O-Ring |
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Seal O-Ring |
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Filter AS |
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Hose AS |
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Seal O-Ring |
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Tee-Swivel |
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Connector-Seal |
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Hose AS |
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6E1572 |
Seal Shaft |
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Ring |
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Seal |
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Shaft GP |
***Group 4***
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Qty |
Part Number |
Description |
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Seal O-Ring |
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Seal O-Ring |
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Filter AS |
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Hose AS |
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Seal O-Ring |
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Tee-Swivel |
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Connector-Seal |
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Hose AS |
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Connector-Seal |
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7M8485 |
Seal O-Ring |
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2089670 |
Ring-Retaining |
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Ring |
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Seal ? Lip Type |
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Shaft GP |
ACTION REQUIRED
- See the attached Rework Procedure.
SERVICE CLAIM ALLOWANCES
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Parts Age (whichever comes first) |
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Parts |
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0-60 mos |
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| NOTE: This is a 6.0?hr job for M312. | ||||||
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 the following parts from the machine:
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- Remove shaft snap-ring, seal cover, and shaft seal. (See Fig 3)
- 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. 5)
- Re-install shaft snap ring.
- Clean pump face, and engine flywheel housing.
- Re-install main pump, using Loc-tite 17430 on the pump face and the inspection plate to seal the joint.
- Install shaft coupling to main pump shaft.
- Re-Install swing pump.
- Install the following parts as shown in the drawing:
8U-0198 Filter AS
148-8444 Tee AS
130-8233 Hose AS
148-8328 Connector AS
194-7844 Hose AS
148-8328 Connector AS
9S-8008/112-4630 Plug (Pos g; Hold this plug; it will be installed in the old drain line port)
- b. 8U-0198 Filter AS with
c. 203-1926/246-6167 Hose AS
d. 250-1656 Hose AS with 3D-2824 Seal O-Ring, 6V-8637 Connector?Seal and 6V-9746 Seal O-Ring
e. 150-4033 Tee AS (6V-9846 Tee and 6V-9746 O-rings) with 3D-2824/2M9780 Seal O-Ring, 6V-8637/6V-8640 Connector ? Seal and 6V-9746 Seal O-Ring
Figure
2: New hose routing
Figure 4: Cut-away view of pump with location of the shaft seal
Figure 5: Correct orientation of seal
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