Toro Groundsmaster 7210 Service Manual page 99

Test Procedure (continued)
Groundsmaster 7210
16222SL Rev C
10. Use a phototac to measure the engine speed, move the throttle so that the
engine speed is 2,800 rpm (not full speed).
11. Have an operator slowly push the traction lever for the pump that is being
tested to fully forward position. Keep the other traction lever in the N
position.
12. Slowly close the tester flow control valve until the pressure gauge reading is
6,900 kPa (1,000 psi).
13. Check the engine speed with a phototac and ensure that the engine speed is
still 2,800 rpm.
14. Observe the flow gauge.
Note: The tester reading should be approximately 50.3 L/minute (13.3
gallons/minute) for a traction pump in good condition.
15. Open the tester flow control valve, release the traction lever to the N
position and shut off the engine. Record the test results.
16. A normal traction pump flow is 50.3 L/minute (13.3 gallons/minute). A
lower pump flow may result in reduced traction circuit performance. If the
flow is less than 41.6 L/minute (11 gallons/minute) or a pressure of 6,900
kPa (1,000 psi) cannot be obtained:
A. The traction control lever may need adjustment.
B. If the engine speed drops excessively as the tester flow control valve is
closed, the engine performance should be evaluated; refer to
Diesel Engine (page
C. If the engine speed does not drop, the pressure and flow specifications
are not met, the tested transmission piston pump needs to be inspected,
repaired, or replaced as necessary.
17. If the transmission piston pump flow specification is met, and you identify a
traction circuit problem, consider that a wheel motor is worn or damaged;
refer to Test Procedure (page
18. Release pressure from the hydraulic system; refer to
from the Hydraulic System (page
19. Disconnect the tester from the transmission fitting and hose, and connect the
hydraulic hose to the transmission port fitting again.
20. If necessary, repeat the flow test for other transmission piston pump.
3–1).
4–44).
4–11).
Page 4–39 Hydraulic System: Testing the Hydraulic System
EUTRAL
EUTRAL
Chapter 3:
Releasing Pressure