Toro Groundsmaster 5900 Series Service Manual page 149

Procedure for Piston (Traction) Pump Flow Test (continued)
Groundsmaster ® 5900 & 5910
16227SL Rev B
4. Install 40 GPM tester (flow and pressure) in series between disconnected
hose and manifold fitting to allow flow from piston (traction) pump to tester.
Use hydraulic hose kit (see
machine. Make sure that fitting and hose connections are properly tightened.
Also, make sure the flow control valve on tester is fully open.
5. After installing tester, start engine and run at low idle speed. Check for
hydraulic leakage at tester connections and correct before proceeding with
test.
6. Slowly increase engine speed while using the Info- Center Display to adjust
engine speed to 2200 RPM (NOT normal high idle speed).
7. With engine running at 2200 RPM, disengage the parking brake, select high
range (transport) operation and slowly push traction pedal to fully forward
position. Keep pedal fully depressed in the fully forward position.
8. Have second person watch pressure gauge on tester carefully while slowly
closing the flow control valve until 69 bar (1000 PSI) is obtained. Verify with
the InfoCenter display that the engine speed is still 2200 RPM.
Note: If engine speed drops during testing, pump flow will decrease and
flow test results will be inaccurate.
9. Observe flow gauge. Flow indication should be approximately 142 LPM
(37.5 GPM).
10. Once piston pump flow is identified, release traction pedal to the neutral
position, open flow control valve on tester, lower engine speed to low idle and
shut off engine. Record test results.
11. If flow is less than 127 LPM (33.6 GPM), consider the following:
A. The traction pedal is not calibrated correctly (see
Sensor Calibration (page
B. The piston pump swash plate is not being rotated fully (e.g. traction
speed is not set to 100%).
C. The forward traction relief valve is leaking or faulty.
D. The piston pump needs to be repaired or replaced as necessary.
12. Make necessary repairs before performing any additional traction circuit tests.
13. When testing is complete, disconnect tester from manifold fitting and machine
hydraulic hose. Reconnect hose to manifold fitting. Lower machine to ground.
14. Make sure that the hydraulic tank is full before returning machine to operation.
Special Tools (page
6–51)).
Page 5–49
2–15)) to connect tester to
Traction Pedal Position
Hydraulic System: Testing