Direct Drive Transmission Front Output (All Wheel Dirve) Shaft Failures Caterpillar

Reference: Service Manual Module SENR1206-01, Disassembly and Assembly 416C, 426C, 428C, 436C, and 438C Backhoe Loaders Power Train.

Service Magazine Article; "Assembling the Transmission Thrust Bearings for Backhoe Loaders"; June 28, 1999; Page 9.

Problem:

Failure of the Front Output Shaft in the Direct Drive Transmission for some All-Wheel Drive machines have been reported. The shaft failures have resulted from the loosening and dislocation of the 9U-8875 Retaining Ring (3)on the 152-8117 Shaft Assembly (1). See Illustration 1.

Machines with the following transmission serial numbers are subject to this type of shaft failure: 15588 D97 7674 through 15588 B98 15009.

Solution:

Replace the parts shown in Table 1 and Illustration 1. See Service Manual Module SENR1206-01 and Service Magazine article listed for disassembly and assembly instructions.

NOTE: The parts listed in Table 1 ALL require replacement. Inspect all other parts and replace as necessary.

A Service Letter to address the shaft failures is pending.

Illustration 1.

Transmission (Direct Drive) Front Output Shaft.

(1) Shaft Assembly.

(2) Retainer.

(3) Retaining Ring.

(4) Plate.

COPYRIGHT 1999 CATERPILLAR ALL RIGHTS RESERVED