SHOP MANUAL
Ch 5 page 33
HYDRAULIC SYSTEM
Orbitrol:
• Displacement: 250 cm³ (15.25 in³ / rev)
• Rated oil flow: 25 L/min (6.60 U.S. gal / min)
The Steering Master Valve is located on the cab front
wall (firewall). Access is obtained by tilting the cab.
(Ref. Operation and Maintenance Handbook)
Removal
Thoroughly clean the steering servo valve and the area
around for any accumulated dirt.
Place a container below the valve to catch any hydraulic fluid
spilt during removal.
Mark each hydraulic line for proper location and plug lines as they are removed from valve.
From inside the cab unscrew the four bolts securing the valve to the cab floor
Lift the steering master valve out from the truck for exchange or overhaul. If the valve is exchanged, save the
connectors attached to the valve body.
Installation
Check the condition of the connector seals, replace if necessary. Install the connectors in the valve body. Apply
a light coat of oil to the connector seals, and tighten.
Apply a light coat of oil on the axle splines, and position the valve on the cab, and insert the fastening bolts.
Check that the valve is properly seated, and tighten the four bolts.
Install the hoses.
Control
Before startup - Check that all connections are located in the same positions as before removal, and that all
hoses are correctly routed.
Perform startup test procedure. Ref. section: Startup test procedure.
Steering Master Valve (Orbitrol)
Figure 21
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