2008/05/05 Caterpillar

Landfill Compactor:

826H (S/N: AWF1-UP)

836H (S/N: BXD1-UP)

Soil Compactor:

825H (S/N: AZW1-UP)

Wheel Dozer:

824H (S/N: ASX1-UP)

834H (S/N: BTX1-UP)

Wheel Loader:

980H (S/N: JMS1-UP)

988H (S/N: BXY1-UP)

Description of Change: The service brake housing has been modified in order to reduce the probability of seal damage upon installation. See illustration 1. There will be new fittings for the ends. The internal tubes that mate to the service brake housing have been modified in order to reduce the probability of seal damage upon installation. These fittings will mate to the service brake housing of the tube to the front and rear axles. Finally, the assembly process has been improved at the factory via new tooling.

Adaptable To: The new service brake housing and tube assemblies are direct replacements for the previous parts. A parts list for the Large Wheel Loaders is listed below. See table 1.

Illustration 1	g01492393
The service brake housing (A) Increased diameter (B) This area has been deburred. (C) Increased size of the chamfer

Illustration 2	g01473917
The short chamfer on the adapter tube may contribute to additional movement in the saddle during assembly. (D) Tube assembly (Current design)

Illustration 3	g01473941
Clearance and movement will be reduced by increasing the outside diameter of the adapter. The chamfer will also be modified in order to avoid excessive movement of the tube which can lead to seal damage. (E) Tube assembly (Revised design)

This change is effective on the following machines.

• 826H (S/N: AWF478-UP)

• 836H (S/N: BXD679-UP)

• 825H (S/N: AZW291-UP)

• 824H (S/N: ASX309-UP)

• 834H (S/N: BTX354-UP)

• 980H (S/N: JMS4070-UP)

• 988H (S/N: BXY2422-UP)