Toro Workman 3000 Series Service Manual page 207

Procedure for Gear Pump Flow and System Relief
Pressure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the vehicle for approximately 10
minutes.
2. Park vehicle on a level surface, raise and support bed
(if installed), shut engine off and engage the parking
brake. After turning engine off, operate all hydraulic con-
trols to relieve hydraulic system pressure.
3. Make sure that gear pump drive belt is adjusted prop-
erly (see Operator's Manual).
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS, and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow meter is showing that the oil will
flow from the pump, through the tester, and into the
hydraulic hose.
4. With the engine off, clean hose fitting and disconnect
the pressure hose from the gear pump (Fig. 14). Install
tester with pressure gauges and flow meter in series be-
tween the gear pump and the disconnected hose. Make
sure the tester flow control valve is open.
5. Make sure the hydraulic reservoir (transaxle) is full
after connecting the tester.
CAUTION
The engine must be running to perform hydrau-
lic tests. To guard against possible personal in-
jury, engage parking brake and keep clothing,
hands, feet, face and other parts of the body
away from fan and other moving parts.
6. After installing tester, start engine and run at idle
speed. Check for hydraulic leakage and correct before
proceeding with test.
IMPORTANT: In this test, the flow tester is posi-
tioned before the relief valve. Pump damage can oc-
cur if the oil flow is fully restricted.
7. Start engine and adjust engine speed with accelera-
tor pedal so pump speed is 2700 RPM (engine speed
approximately 3600 RPM). Verify pump speed with a
phototac.
Workman 3000/4000 Series
8. While watching tester pressure gauges, slowly close
flow control valve on the tester until 1500 PSI (103.4
Bar) is obtained on gauge. Verify that pump speed con-
tinues to be correct (2700 RPM). Record flow meter
reading.
GAUGE READING TO BE: Flow should be approxi-
mately 4.3 GPM (16.3 LPM) at 1500 PSI (103.4 Bar).
9. Open tester flow control valve and stop engine.
10.If pump flow specification is not met, inspect for:
A. Slipping pump drive belt.
B. Worn or stuck relief valve.
C. Pump suction line restriction.
D. Gear pump needs to be repaired or replaced.
11. To test system relief pressure:
A. Make sure flow control valve on tester is fully
open.
B. Start engine and depress accelerator pedal so
engine is running at high idle (3600 + 50 RPM).
IMPORTANT: Hold steering wheel at full lock
only long enough to get a system pressure read-
ing. Holding the steering wheel against the stop
for an extended period can damage the steering
control valve.
C. Watch pressure gauge carefully while turning the
steering wheel completely in one direction (full steer-
ing lock) and holding momentarily.
D. System pressure should be approximately 1800
PSI (124.1 Bar) as the relief valve lifts. Return steer-
ing wheel to the center position.
E. Release accelerator pedal to allow engine to re-
turn to low idle and turn off vehicle. Record test re-
sults.
12.If relief pressure is incorrect, inspect for:
A. Slipping pump drive belt.
B. Worn or stuck relief valve.
13.Remove tester and reinstall disconnected hose.
Page 9 – 17 Hydraulic System