Toro 07390 Workman HDX-Auto, Service Manual, Page: 211 / 280

Workman HDX Auto Page 7 − 27 Hydraulic System
Procedure for High Flow Hydraulics 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 ten
(10) minutes.
2. Park vehicle on a level surface, raise and support
cargo bed (if installed), shut engine off and apply the
parking brake. After turning engine off, operate all hy-
draulic controls to relieve hydraulic system pressure.
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 pressure (P) coupler, through the test-
er and into the return (T) coupler (Fig. 23).
3. With the engine off, install tester with pressure
gauges and flow meter in series between the quick dis-
connect couplings at the rear of the vehicle. Make sure
the tester flow control valve is open.
4. Make sure the hydraulic reservoir is full after con-
necting the tester.
CAUTION
The engine must be running to perform hydraulic
tests. To guard against possible personal injury,
engage parking brake and keep clothing, hands,
feet, face and other parts of the body away from
moving vehicle parts while testing.
5. After installing tester, start engine and run at idle
speed. Turn high flow hydraulics switch ON and check
for hydraulic leakage from connections. Correct before
proceeding with test.
6. Depress accelerator pedal so engine speed is 3600
RPM. Verify speed with a phototac.
7. With high flow hydraulics switch still in the ON posi-
tion, watch tester pressure gauges while slowly closing
flow control valve on the tester until 1500 PSI (103.4 bar)
is obtained on gauge. Verify that engine speed contin-
ues to be 3600 RPM. Record flow meter reading.
GAUGE READING TO BE: A pump in good condi-
tion should have a flow of approximately 7.3 GPM
(27.6 LPM) at 1500 PSI (103 bar).
8. Open tester flow control valve, release accelerator
pedal to allow engine to return to low idle, turn high flow
hydraulics switch OFF and stop engine.
9. If the measured pump flow is lower than 6.1 GPM
(23.1 LPM) or a pressure of 1500 PSI (103 bar) could not
be obtained, inspect for:
A. Worn or stuck relief valve (SVRV).
B. Pump suction line restriction.
C. Gear pump needs to be repaired or replaced.
10.To test high flow hydraulics 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 RPM). Turn high
flow hydraulics switch ON.
IMPORTANT: Close flow control valve on tester
only enough to get a system relief pressure read-
ing.
C. Watch pressure gauge carefully while slowly clos-
ing the tester flow control valve until the relief valve
opens.
D. System pressure should be approximately 2000
PSI (137.9 bar) as the relief valve lifts.
E. Open tester flow control valve, release accelera-
tor pedal to allow engine to return to low idle, turn high
flow hydraulics switch OFF and stop engine. Record
test results.
11. If relief pressure is incorrect, inspect for a worn, stuck
or damaged relief valve (SVRV) in control manifold (see
Hydraulic Manifold (Vehicles with High Flow Hydraulics)
in the Service and Repairs section of this chapter).
12.When testing is completed, remove tester from quick
disconnect couplings.
Hydraulic
System