Improved Tilt Cylinder Head End Relief Valves Are Used on Certain 986H Wheel Loaders {5051, 5051, 5104} Caterpillar


Improved Tilt Cylinder Head End Relief Valves Are Used on Certain 986H Wheel Loaders {5051, 5051, 5104}

Usage:

986H L8S
Wheel Loader
986H (S/N: L8S1-UP)

Description Of Change: Improved tilt cylinder head end relief valves (451-6647) are used on certain 986H Wheel Loaders. The improved relief valves have better flow capabilities which result in quieter operation.

Adaptable To:

Table 1
Required Parts for Machines Equipped with Ride Control 
Installed
Main Control Valve 
Item  Qty  Part Number  Description 
370-7351  363-6517  Relief Valve Gp 
451-5893  451-6647  Relief Valve Gp 
For machines equipped with a 451-5893 Main Control Valve Gp, the new 451-6647 Relief Valve Gp is effective and in production with S/N:L8S329-UP.

The relief valves listed in Table 1 have different dimensions which require different valve bodies to fit. For machines equipped with a 370-7351 Main Control Valve Group, replace with same 363-6517 Relief Valve Group if noise occurs.

Table 2
Required Parts for Machines Not Equipped with Ride Control 
Installed
Main Control Valve 
Item  Qty  Part Number  Description 
370-7352  363-6517  Relief Valve Gp 
451-5875  451-6647  Relief Valve Gp 
For machines equipped with a 451-5875 Main Control Valve Gp, the new 451-6647 Relief Valve Gp is effective and in production with S/N:L8S338-UP.

The relief valves listed in Table 2 have different dimensions which require different valve bodies to fit. For machines equipped with a 370-7352 Main Control Valve Group, replace with same 363-6517 Relief Valve Group if noise occurs.

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