Toro Groundsmaster 360 Service Manual page 102

Test Procedure (continued)
Hydraulic System: Testing the Hydraulic System
B. A transmission traction relief valve or flushing valve is leaking or
damaged.
C. The charge pump in the transmission is damaged (the PTO operation
may also be affected).
10. Next, determine the charge pressure under traction load by operating the
machine in a direct forward and reverse direction. Ensure that the engine is
running at full speed (3,000 rpm).
Note: When applying brakes, ensure that the parking brake latch is not
pressed. The engine will stop if the parking brake latch is pressed.
11. Firmly apply the brakes and press the traction pedal in the forward direction
and then to reverse while you monitor the pressure gauge. Release the
traction pedal to N
EUTRAL
A. The charge pressure should not drop more than 15% from the initial test
reading (8) as the machine is moving (e.g., if the initial charge pressure is
830 kPa (120 psi), charge pressure while the machine is moving should
be above 700 kPa (102 psi).
B. A pressure drop of more than 15% indicates a traction circuit leak (e.g., a
leaking transmission check valve, a worn/damaged transmission piston
pump). If charge pressure is good under no load, but the pressure drops
below specification when under a traction load, the transmission piston
pump(s) are probably worn or damaged.
Note: When a piston pump is worn or damaged, the charge pump cannot
keep up with internal leakage in the traction circuit.
12. Stop the machine and shut off the engine.
13. Release pressure from the hydraulic system; refer to
from the Hydraulic System (page
14. Remove the pressure gauge from the transmission charge-pressure test port.
, shut off the engine, and record the test results.
4–5).
Page 4–44
Releasing Pressure
Groundsmaster 360
16225SL Rev C