Usage:
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 Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS8017" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
NOTE: This Revised Service Letter replaces the September 29, 1993 Service Letter. A change was made to Step 11 of the Rework Procedure.
Termination Date
September 30, 1994Problem
The 6E5215 Filter Group may be installed in a manner that allows hydraulic oil to flow in a reverse direction through the filter and base on certain 446B Backhoe Loaders.
Affected Product
Model & Identification Number
446B 5BL132-242
Parts Needed
Action Required
See attached rework procedure.
Service Claim Allowances
NOTE: This is a 2-hour job. If a 9Y1834 Cooler Assembly is required, an extra .5 hour of labor may be claimed.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling. Attach. (1-Rework Procedure)
Attach. ( 1 - Rework Procedure)
Rework Procedure
NOTE: Remove the 9R0289 Plate from the floor to examine the top of the 6E5215 Filter Base Group. Arrows on the top of the base should point toward the front of the tractor. If the arrows point toward the front, replace the 9R0289 Plate, and no further rework is necessary. If the arrows point toward the rear of the tractor, proceed with the rework steps below.
1. Lower all implements on the loader.
2. Relieve all hydraulic system pressure.
3. Secure the tractor so that it cannot move unexpectedly.
4. Ensure the hydraulic system temperature is low enough to prevent burns if oil or system components come in contact with the skin.
5. Remove the 8T4186 Bolts that retain the 6E5215 Filter Group to the right side of the frame behind the right rear tire. This can be performed from the outside of the vehicle. Refer to page 217.01 to 217.02 in the 446B Parts Book, form SEBP2193.
6. Remove the connections to the filter from the 9R9792 and 9R9793 Tube Assemblies.
7. Remove the filter assembly.
NOTE: It may be necessary to loosen some of the tube clamps to gain adequate access to remove the existing filter base and element. Also, removal of the 9R0289 and 9R7056 Plates from the floor may provide added access for the rework.
NOTE: Some oil loss may occur when the tubes are disconnected, so a method of collecting this spillage will be needed or the tank may be drained to minimize oil loss.
8. Remove the 9R9797 Bracket from the existing 6E5215 Filter Group.
9. Install the 9R9797 Bracket onto the new 6E5215 Filter Group.
10. Install new 6V8400 Seal-O-Rings on the tube connectors and install a new 6E5215 Filter Group to the tubes. Be careful to avoid damaging the tube seal-o-ring. Be sure arrows on top of filter base point toward the front of the tractor.
11. Install (and tighten to standard torque) the 8T4186 Bolts that retain the filter group to the right side of the frame behind the right rear tire.
12. After installing the new filter group, cut apart the removed filter element to check if a reverse flow of hydraulic oil has damaged the paper element. Remove the 6E4192 Screen from the hydraulic tank and check for debris from a damaged filter or base. Refer to page 242 of the 446B Parts Book, form SEBP2193.
NOTE: If no filter or base damage is apparent and no debris found in the screen, refill the hydraulic system and test for leakage.
If the filter or the base is damaged, or debris is found in the 6E4192 Screen, clean or replace the 7W8751 Hydraulic Cooler Core. After this has been completed, refill the hydraulic system and test for leaks.