Toro Groundsmaster 5900 Series Service Manual page 158

Procedure for Deck Motor Case Drain Leakage Test (continued)
Hydraulic System: Testing
3. Install 40 GPM tester (flow and pressure) in series with the deck motor and
the disconnected return hose. Make sure the flow control valve on tester
is fully open.
4. Start engine and run at low idle speed. Check for hydraulic leaks at tester
connections and make corrections if necessary before proceeding with test.
5. Increase engine speed and make sure hydraulic oil is at normal operating
temperature (54 to 66 ºC (130 to 150 ºF)) by operating the machine for
approximately ten (10) minutes. Stop engine and remove key from key
switch.
6. Chock the wheels so that the machine will not move during testing.
7. For the deck motor to be tested, disconnect the motor case drain hose (small
diameter hose) where it connects to the front PTO manifold tee fitting or
hydraulic tube at the side PTO manifold (not at the motor). Put a steel cap on
the open tee fitting or tube connection; leave the case drain hose open.
Cutting deck blades will rotate when lowered with PTO switch in
ON position. Keep away from cutting decks during test to prevent
personal injury from rotating blades. Do not stand in front of the
machine during test.
8. Sit on seat, start the engine and increase engine speed to high idle speed
(2530 RPM). Engage cutting decks. Do not depress the traction pedal during
testing procedure.
9. While watching tester pressure gauge, have a second person slowly close
flow control valve on tester until a pressure of 83 bar (1200 PSI) is obtained.
Note: Use a graduated container, special tool TOR4077, to measure case
drain leakage.
g031767
10. Have the second person measure flow from the open case drain hose for
fifteen (15) seconds, then disengage the cutting decks, open flow control
valve on tester and stop the engine. Record test results.
TEST RESULTS: Case drain leakage should be less than 672 ml (23 ounces)
of hydraulic fluid in fifteen (15) seconds.
11. If case drain flow is more than 672 ml (23 ounces), the deck motor is worn
or damaged and should be repaired or replaced.
CAUTION
Figure 65
Page 5–58 Groundsmaster ® 5900 & 5910
16227SL Rev B