Procedure for Gear Pump Flow and System Relief
Pressure Test (Workman HD)
8. While watching tester pressure gauges, slowly close
flow control valve on the tester until 1500 PSI (103 bar)
is obtained on gauge. Verify that pump speed continues
to be correct (2270 RPM). Record flow meter reading.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the vehicle for approximately ten
(10)
minutes.
GAUGE READING TO BE: Flow should be approxi-
mately 3.4 GPM (12.9 LPM) at 1500 PSI (103 bar).
2.
Parkvehicleonalevelsurface,raiseandsupportbed
(if installed), shut engine off and engage the parking
brake. After turning engine off,operate allhydraulic con-
trols to relieve hydraulic system pressure.
9. Open tester flow control valve, release accelerator
pedal and stop engine.
10.If
measured flow is less than 2.8 GPM (10.6 LPM)
3.
erly (see Operator’s Manual).
Makesurethatgearpumpdrivebeltisadjustedprop-
or a pressure of 1500 PSI (103 bar) cannot be obtained,
inspect for:
A. A slipping pump drive belt.
CAUTION
B. Pump suction line restriction.
C. Gear pump needs to be repaired or replaced.
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.
D. If pump speed of 2270 RPM cannot be main-
tained during test, consider that engine performance
problems exist.
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.
11.To test system relief pressure:
A. Make sure flow control valve on tester is fully
open.
4.
With the engine off, clean hose fitting and disconnect
B. Start engine and depress accelerator pedal so
engine is running at high idle (3600 RPM).
the pressure hose from the gear pump (Fig. 19). 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.
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.
5.
after connecting the tester.
Make sure the hydraulic reservoir (transaxle) is full
C. Watch pressure gauge carefully while turning the
steering wheel completely in one direction (full steer-
ing lock) and holding momentarily.
CAUTION
Theenginemustberunningtoperformhydraulic
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.
D. System pressure should be approximately 1800
PSI (124 bar) as the relief valve lifts. Return steering
wheel to the center position.
E. Release accelerator pedal to allow engine to re-
turn to low idle and stop engine. Record test results.
6.
After installing tester, start engine and run at idle
speed. Check for hydraulic leakage and correct before
proceeding with test.
12.If
relief pressure is incorrect, inspect for a worn or
stuck relief valve in steering control valve (see Steering
ControlValveServiceintheServiceandRepairssection
of this chapter).
7.
Fully depress andhold accelerator pedal. Check that
engine speed is 3600 RPM and also check that pump
speed is approximately 2270 RPM. Verify engine and
pump speed with a phototac.
NOTE: On Workman HD vehicles, a slipping pump
drive belt will result in incorrect relief pressure.
13.After
stall disconnected hose.
testing is completed, remove tester and rein-
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.
Workman HD Series
Page 9 -- 23
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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