Toro Multi Pro 1750 Service Manual page 73

Testing Steering Control Valve and Steering Cylin-
der
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
2. Perform the Hydraulic Pump Flow and Relief Pres-
sure 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, excessive weight on the vehicle and/or binding
of the steering assembly (e.g. wheel spindles, tie rods,
steering pivot). Make sure that these items are checked
before proceeding 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 the 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 trunnion is fully
extended.
C. Turn the engine off and engage the parking
brake.
D. Read and follow the Precautions for Hydraulic
Testing in this chapter.
E. Clean the hose fitting and disconnect the hy-
draulic hose from the fitting on the trunnion end of the
steering cylinder (Fig. 18). Plug the end of the hose.
Multi Pro 1750
1
2
1. Steering cylinder
2. Trunnion end
Keep body and hands away from disconnected
hose and fitting 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.
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 should 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
Valve Service in the Service and Repairs section of this
chapter).
7. After testing is completed, reconnect hose to the
steering cylinder. Check and adjust hydraulic oil level.
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3
Figure 18
3. Hydraulic hose
WARNING
Hydraulic System