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Steering Control Valve and Steering Cylinder Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
2. Perform the Steering Circuit Relief Pressure and
Gear Pump Flow tests to make sure that relief valve and
gear pump are functioning correctly.
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 pro-
ceeding with any hydraulic testing procedure.
3. Drive machine slowly in a figure eight on a flat level
surface.
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.
4. Stop machine with the engine running. Turn steering
wheel with small quick movements in both directions.
Let go of the steering wheel after each movement.
A. The steering must immediately return to the neu-
tral position.
B. The steering wheel or front wheels should not
continue to turn.
5. If either of these performance tests indicate a steer-
ing problem, determine if the steering cylinder is faulty
using the following procedure.
A. Park machine on a level surface with the spray
system turned off.
B. With the engine running, turn the steering wheel
to the right (clockwise) until the steering cylinder rod
is fully contracted.
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 barrel end of the steering cylinder. Plug the
end of the disconnected hose.
Keep body and hands away from disconnected
under high pressure. Use paper or cardboard,
WARNING
hoses and fittings that might eject hydraulic fluid
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.
IMPORTANT: Do not turn steering wheel to the
left (counterclockwise) as system damage may
occur.
F. With the engine off, continue turning the steering
wheel to the right (clockwise) with the steering cylin-
der fully contracted. 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.
G. Remove plug from the disconnected hydraulic
hose. Reconnect hose to the steering cylinder.
6. If steering problem exists and the steering cylinder,
steering circuit relief valve pressure and gear pump flow
tested acceptably, steering control valve requires ser-
vice (see Steering Control Valve and Steering Control
Valve Service).
Hydraulic
System
Multi Pro 5700–D Page 4 – 21 Hydraulic System