Toro Groundmaster Series Service Manual page 132

Test Procedure (continued)
Hydraulic System: Testing the Hydraulic System
B. When steering wheel is released, steering control valve should return to
the neutral position with no additional turning.
4. If a steering problem is suspect, determine if the steering cylinder or circuit
relief valve is damaged using the following procedure:
A. Park the machine on a level surface, lower the cutting unit (or attachment),
and engage the parking brake.
B. With the engine running, turn the steering wheel to the right (clockwise)
until the steering cylinder rod is fully extended and set the key switch
to the O position.
FF
C. Read and adhere to the information provided in
System (page 5–22).
D. Clean the hydraulic fitting and hose end at the rod end of the steering
cylinder and disconnect the hydraulic hose.
E. Install a pressure gauge at the end of the disconnected hose.
F. With the engine not running, continue turning the steering wheel to the
right (clockwise). Monitor the hydraulic fluid at the open fitting on the
steering cylinder as the steering wheel is turned to the right.
G. Start the engine and run it at low-idle speed. Check for hydraulic fluid
leaks and correct before continuing the test.
H. Set the engine speed to approximately 2,000 rpm. Use the TDM
display/controller screen to check that the engine speed is correct.
Turn the steering wheel to the left only long enough to get a
system pressure reading. Turning the steering wheel to the left
for an extended period may damage the steering control valve.
I. Monitor the pressure gauge carefully when turning the steering wheel
for a left turn (counterclockwise).
J. The system pressure should be approximately 7,000 to 7,500 kPa (1,015
to 1,088 psi) as the relief valve opens.
K. Return the steering wheel to the N
the O position, and record the test results.
FF
5. If the hydraulic fluid comes out of the fitting while turning the steering wheel
to the right, the steering cylinder has internal leakage and should be replaced
or repaired; refer to
Service (page 5–101).
6. If the relief valve pressure specification is not met, replace or repair the
steering control valve; refer to
Control Valve Service (page
7. After testing:
A. Connect all hydraulic hoses.
B. Check and adjust the level of the hydraulic fluid in the hydraulic reservoir;
refer to the traction unit Operator's Manual.
C. Start the engine and operate the steering system. Check for any
hydraulic fluid leaks. Repair hydraulic leaks if necessary before returning
the machine to service.
IMPORTANT
EUTRAL
Steering Cylinder (page 5–98)
Steering Control Valve (page 5–95)
5–97).
Page 5–46
Testing the Hydraulic
position, set the key switch to
or Steering Cylinder
or
Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A
Steering