Multi Pro 1200/1250 Hydraulic SystemPage 4 -- 17
Procedure for Steering Control Valve and
Steering
Cylinder
Test:
1. Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
(10) minutes.
2. Perform the Steering Pump R elief Pressure and
Steering Pump Flow tests to make sure that pump and
relief valve are functioning correctly.
NOTE: This steering test procedure will be affected by
incorrect tire pressure, binding of the hydraulic steering
cylinder,excessiveweightonthevehicleand/orbinding
of the steering assembly (e.g. wheel spindles, tie rods,
steeringpivot). Makesure thattheseitems arechecked
beforeproceedingwithanyhydraulictestingprocedure.
3. Drive machine slowly in a figure eight on a flat level
surface.
A. There should be no shaking or v ibration 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. Stopmachinewiththeenginerunning.Turnsteering
wheel with small quick movements in both directions.
Let go of the steering wheel after each movement.
A. The steering must immediately return to theneu-
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. Turn the steering wheel all the way to the right
(clockwise) so the steering cylinder rod is fully ex-
tended.
C. Turn engine off and engage the parking brake.
D. Read Precautions for Hydraulic Testing.
E. Removehydraulichosefromthefittingontherod
endofthesteeringcylinder.Plugtheendofthehose.
WARNING
Keep body and hands away from disconnected
hose and fitting that might eject hydraulic fluid
under high pressure. Use paper or cardboard,
nothands,tosearchforleaks.Hydraulicfluides-
caping under pressure can have sufficient force
to penetrate the skin and cause serious injury. If
fluidisinjectedintotheskin,itmustbesurgically
removed within a few hours by a doctor familiar
withthistypeofinjury.Gangrenemayresultfrom
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 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.
G. Remove plug from the hydraulic hose. Recon-
nect hose to the steering cylinder.
6. If steering problem exists and the steering cylinder
tested acceptably, steering control valve requires ser-
vice (see Steering Control Valve and Steering Control
ValveService in the Service and Repairs section of this
chapter).
Hydraulic
System
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