Replacement Of Nuts With Locknuts On The Hydraulic Oil Tank For The Motor Grader Caterpillar

Problem:

The 9T-7984 Hydraulic Tank Gp on certain 12H, 120H, 135H, 140H and 160H Motor Graders may have been assembled with the 6V-8801 Nuts in place of the 2K-4973 Locknuts. Vibration may cause the 6V-8801 Nuts to come loose. As a result, the hydraulic oil tank may leak.

Solution:

Visually inspect all 84 nuts on the hydraulic oil tank and identify any 6V-8801 Nut that may have been used in error. Reference Illustration 1 and Illustration 2 for examples of 6V-8801 Nuts and 2K-4973 Locknuts for the inspection of the tank. NOTE:

Replace all 6V-8801 Nuts with 2K-4973 Locknuts. The 2K-4973 Locknuts must be tightened to a torque of 61 ± 9.5 N·m (45 ± 7 lb/ft). Nut runners should be used to tighten all bolts and nuts.

NOTE: Although the access to some of the nuts may be difficult, it is not necessary to remove the hydraulic oil tank in order to replace the nuts.

Illustration 1. 6V-8801 Nuts (flat on both sides)

Illustration 2. 2K-4973 Locknuts (raised or rounded on one side)

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