PRODUCT SUPPORT PROGRAM FOR REPLACING THE STEERING HOSE ON CERTAIN M312, M315, M318, AND M320 EXCAVATORS
Usage:
SEBE7914-01
February 7, 2002
(Revised July 2002)
U-36
A-27
AU-23
S-23
H-23
O-29
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After failure only | PRODUCT SUPPORT PROGRAM FOR REPLACING THE STEERING HOSE ON CERTAIN M312, M315, M318, AND M320 EXCAVATORS | |
4304 |
PS50396
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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 7, 2002 Service Letter. Changes have been made to the Affected Product.
TERMINATION DATE
February 29, 2004PROBLEM
The 1655872 steering hose can leak due to cuts on the inside diameter of the hose. These leaks only affect product identified in the following chart.AFFECTED PRODUCT
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Model | Identification Number |
M312 | 6TL1170-1600 |
M315 | 7ML2030-2540 |
M318 | 6ES243-300
8AL2650-3100 8SS489-610 |
M320 | 9PS328-420 |
PARTS NEEDED
1 ? 1655872 Hose As.1 ? 6V8731 Union ORFS
ACTION REQUIRED
See 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)
(2-Illustrations)
Rework Procedure
- Locate steering hose 1655872 by referring to Illustration #1 and Illustration #2. The hose is connected to the back end of the pilot pump, and to the steering control valve under the cab.
- Loosen and remove the steering hose fittings from the pilot pump and the steering valve identified in step 1.
- Attach the 6V8731 union to the hose end previously connected to the pilot pump.
- Attach the straight hose coupling of the new 1655872 hose to the other side of the 6V8731 fitting (connected to old hose).
- Starting under the cab, pull the steering hose (removed from the steering valve in step 2) through the firewall, until the straight end of the new hose reaches the steering valve.
- Remove and discard the 6V8731 fitting.
- Tighten both ends of the new steering hose (at steering valve and at the pilot pump) to 44 N·m.
Illustrations
Illustration 1
Location of 1655872 hose at steering valve under the cab
Illustration 2
Location of 1655872 hose, mounted to the pilot pump
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