Procedure for Steering Control Valve and Steering
Cylinder Test
WARNING
1.
perature by operating the vehicle for approximately 10
minutes.
Make sure hydraulic oil is at normal operating tem-
Keep body and hands away from disconnected
hoses and fittings that might eject hydraulic fluid
under high pressure. Use paper or cardboard,
not hands, to search for leaks. Hydraulic fluid es-
caping under pressure can have sufficient force
to penetrate the skin and cause serious injury. If
fluid is injected into the skin, it must be surgically
removed within a few hours by a doctor familiar
with this type of injury. Gangrene may result from
such an injury.
NOTE: This steering test procedure will be affected by
incorrect tire pressure, binding of the hydraulic steering
cylinder, excessive weight on the vehicle, and/or binding
of the steering assembly (e.g. wheel spindles, tie rods).
Make sure that these items are checked before proceed-
ing with any hydraulic testing procedure.
2.
Perform the Gear Pump Flow and System Relief
Pressure Tests (see Test No. 1) to make sure that gear
pump and relief valve are functioning correctly.
IMPORTANT: Do not turn steering wheel to the
left (counterclockwise) as system damage may
occur.
3.
Drive vehicle slowly in a figure eight on a flat level sur-
face.
F. With the engine off, continue turning the steering
wheel to the right (clockwise) with the steering cylin-
der fully extended. Observe the open fitting on the
steering cylinder as the wheel is turned. If oil comes
out of the fitting while turning the steering wheel to the
right, the steering cylinder has internal leakage and
must be repaired or replaced.
A. There should be no shaking or vibration in the
steering wheel or front wheels.
B. Steering wheel movements should be followed
immediately by a corresponding front wheel move-
ment without the steering wheel continuing to turn.
G. Remove plug from the disconnected hydraulic
hose. Reconnect hose to the steering cylinder.
4.
Stop vehicle with the engine running. Turn steering
wheel with small quick movements in both directions. Let
go of the steering wheel after each movement. The
steering wheel or front wheels should not continue to
turn.
6.
If steering problem exists and the steering cylinder,
gear pump flow and system relief pressure (see Test No.
tested acceptably, steering control valve requires ser-
1)
vice (see Steering Control Valve and Steering Control
Valve Service).
5.
ing problem, determine if the steering cylinder is faulty
using the following procedure.
If either of these performance tests indicate a steer-
A. Park vehicle on a level surface.
B. With the engine running, turn the steering wheel
to the right (clockwise) until the steering cylinder rod
is fully extended.
C. Turn engine off and engage the parking brake.
D. Read Precautions for Hydraulic Testing.
E. Clean and remove hydraulic hose from the fitting
on the rod end of the steering cylinder. Plug the end of
the disconnected hose (Fig. 15).
Workman 3000/4000 Series
Page 9 – 19
Hydraulic System
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