New Seal Kit Improves Sealing Of Main Pump Shaft Caterpillar


New Seal Kit Improves Sealing Of Main Pump Shaft

Usage:

EXCAVATORSM312 (6TL),
M315 (7ML),
M318 (BMD, 8AL, 6ES, 8SS),
M320 (6WL, 9PS),
EXCAVATORS

Problem:

There are reports that the main pump shaft seal may leak. This is caused by the axial movement of the main pump shaft against the 6E-1572 shaft seal. Main pump leaks that occur as a result of this condition will be noticed on the engine flywheel housing.

The affected main pumps are listed in Table 1.

Solution:

Leakage at the main pump shaft seal is corrected with the addition of a new seal kit. This seal kit includes a new pump shaft seal, an offset cover that changes the location of the seal on the shaft, a new O-ring, an additional spring, and an additional bushing to guide the spring. The new spring and bushing are installed inside the shaft coupling that connects the main pump shaft to the swing shaft. Refer to Illustration 1. The addition of the new spring limits axial movement of the main pump shaft. Seal kit part numbers are listed for each model. Refer to Table 2.

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