Toro Greensmaster 3200 Service Manual page 109

Procedure for Steering Control Valve Check:
1. Make sure the hydraulic tank is full.
2. Start engine. Make sure hydraulic oil is at normal
operating temperature by operating the machine for
approximately 10 minutes.
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 rear wheel.
B. Steering wheel movements should be followed
immediately by a corresponding rear wheel move-
ment without the steering wheel continuing to turn.
4. Stop the unit 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 wheel must go back immediately to
the neutral position.
B. The steering wheel should not continuing to
turn.
Note: The steering wheel must be able to turn with no
more than 45 in–lb (52 kg–cm) of torque.
5. While the machine is stopped and the engine still
running,
A. Turn the steering wheel from stop to stop in each
direction.
B. Count and record the number of times the steer-
ing wheel turns in each direction.
6. Stop the engine.
A. Again, turn the steering wheel from stop to stop
in each direction.
B. Again, count and record the number of times the
steering wheel turns in each direction.
7. Compare the difference in the number of turns in
each direction with the engine running and off. If the dif-
ference is 1 turn or greater in any direction, leakage in
the cylinder, gear wheel set, or suction valve is to large.
Greensmaster 3200/3200–D
RIGHT TURN
8. If leakage is detected in the step above,
A. Make sure machine is parked on a level surface
with the cutting units lowered. Make sure engine is
off and the parking brake is engaged.
B. Read Precautions for Hydraulic Testing.
C. Remove a hose from one of the steering cylinder
fittings. Plug the end of the hose (Fig. 10).
D. Turn steering wheel in the direction of the re-
moved hose.
E. Remove the plug from the hose. Reconnect
hose to the steering cylinder fitting.
F. Remove a hose from the other steering cylinder
fitting. Plug the end of the hose.
G. Turn steering wheel in the other direction.
H. If the steering wheel does not turn in both direc-
tions, the steering cylinder is defective. Other wise
the steering control valve is defective.
I. Remove the plug from the hose. Reconnect
hose to the steering cylinder fitting.
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LEFT TURN
Figure 10
Hydraulic System