Service Manual User Manual

Hydraulic System
9-83
6. Start the engine and run at approximately 1/3 to 1/2
throttle for about one minute without moving the
vehicle or operating any hydraulic functions.
7. Inspect for leaks and check the level of the hydraulic
fluid in the reservoir. Shut the engine OFF.
Note: Check for leaks and repair as required before con-
tinuing. Add hydraulic fluid to the reservoir as needed.
8. Conduct a pressure check of all boom function
hydraulic circuits.
9. Wipe up any hydraulic fluid spillage in, on, near and
around the vehicle, work area and tools.
9.9.6 Steering Valve
The steering valve (Fig. 9–58) is located at the base of
the steering wheel shaft, concealed by the lower dash
cover. The valve is not serviceable and must be replaced
in its entirety if defective.
Steering Valve Replacement
Refer to Section 4 Cab, Covers and Mirrors for steering
valve replacement information. DO NOT attempt to dis-
assemble the steering valve.
Figure 9–58. Steering valve.
9.9.7 Steer Select Valve
The steer select valve and manifold (Fig. 9–59 and
Fig. 9–60) are secured with four capscrews and O-rings
to the hydraulic fluid reservoir/engine mount.
The steer select valve contains two solenoids that direct
the flow of hydraulic fluid according to steering input. The
valve is a direct dual-solenoid operated, spool-type direc-
tional control valve.
Figure 9–59. Steer select valve location and mounting.
The steer select valve controls the start, stop and direc-
tion of hydraulic fluid flow to the steering cylinders
mounted on each axle.
The valve consists of a housing (2, Fig. 9–60), two sole-
noids (3), a control spool (4), and two return springs (5).
In the de-energized state, the spool (4) is held by the
return springs (5) in the center position.
The spool is shifted via the action of the two wet-pin type
solenoids (3). The force of an acting solenoid pushes
against the push pin (6) on the end of the spool (4).
The spool is shifted from its normal position to the end
position for selected flow. The selected flow pattern will
be one of two possible patterns: either P to A and B to T,
or P to B and A to T.
MS2050
Steering Valve
Brake Valve
MS2070
Steer Select
Manifold
Steer Select
Solenoid Valve
Capscrew
Capscrew
Hydraulic Hose
Model 3606 • Origin 10/99