Arms Up Deceleration Valve - Wittke STARLIGHT Maintenance Manual

112 Hydraulic System

Arms Up Deceleration Valve

The Arms Up deceleration valve automatically decelerate the arms as they are raised to the dump
position. A cam bolted to the arm pivot tube rotates as the arms are raised and gradually depresses the
valve spool, reducing the flow of oil exiting the tube end of the arm cylinders.
: The deceleration valve greatly reduces the impact on the arm assembly, body structure and
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hydraulic components.
Location
The Arms Up deceleration valve is fitted to the underside of the body, behind the arm pivot tube on
the curbside.
Figure 7-32 The Arms Up deceleration valve
Adjustment procedure:
1. Raise the arms until they rest on the arms stops.
2. Position the cam so that it depresses the spool of the deceleration valve until there is
approximately 3/16 inch (4.75 mm) of the spool still exposed.
Figure 7-33 Deceleration valve spool
3.
Tighten the retaining bolts of the cam.
3/16"