Toro Groundsmaster 5900 Series Service Manual page 170

Procedure for Gear Pump Flow Test (continued)
Hydraulic System: Testing
To prevent hydraulic tester damage, use 40 GPM Hydraulic Tester
#AT40002 (pressure and flow) and Hose Kit for this test (see
Tools (page 2–15)).
Make sure that the oil flow indicator arrow on the flow gauge is
showing that the oil will flow from the hydraulic hose from the pump,
through the tester and into the manifold fitting.
3. Install 40 GPM tester (flow and pressure) in series with the disconnected
hose and hydraulic fitting in manifold.
4. Make sure the flow control valve on tester is fully open.
5. Start engine and increase engine speed to high idle speed (2530 RPM). Do
not engage the cutting decks. Check for hydraulic leakage at test connection
and correct before proceeding with test.
6. 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.
Make sure the hydraulic reservoir is full.
Do not fully restrict oil flow through tester. In this test, the flow tester
is positioned before the circuit relief valve. Pump damage can occur
if the oil flow is fully restricted.
7. Watch pressure gauge carefully while slowly closing the flow control valve
until 69 bar (1000 PSI) is obtained. Verify with the InfoCenter display that the
engine is still running at the correct high idle speed (2530 RPM).
Note: If engine speed drops during testing, pump flow will decrease and
flow test results will be inaccurate.
8. Normal flow indication for the three (3) gear pump sections is listed in below
table:
PUMP SECTION
FIRST SECTION
SECOND SECTION
THIRD SECTION
9. Once the gear pump section flow has been determined, open tester flow
control valve and stop engine. Record test results.
IMPORTANT
IMPORTANT
IMPORTANT
NORMAL FLOW
83 LPM (22 GPM)
83 LPM (22 GPM)
40 LPM (10.6 GPM)
Page 5–70
Special
MINIMUM FLOW
74 LPM (19.6 GPM)
74 LPM (19.6 GPM)
36 LPM (9.5 GPM)
Groundsmaster ® 5900 & 5910
16227SL Rev B