Spray Pump Drive Circuit Relief Pressure Test
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem•
8. Open control valve on tester, slow engine speed and
shut off engine. Record test results.
A. If relief pressure specification is not met, adjust
spray circuit relief valve (Fig. 19) (see Adjust Relief
Valve in the Adjustments section of this Chapter). Af•
ter adjustment, retest relief valve pressure.
2.
Park machine on a level surface, stop engine, en•
gage parking brake, and remove key from the ignition
switch. After turning engine off, operate all hydraulic
controls to relieve hydraulic system pressure.
B. If relief pressure specification is met, disconnect
tester from tee fitting and spray circuit pressure
hose. Reconnect pressure hose to tee fitting.
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.
1
2
4
IMPORTANT: Make sure that oil flow indicator arrow
on the flow meter is showing that oil will flow from
the pump, through the tester, and into the hydraulic
hose.
3
3.
Clean hydraulic fittings and install tester with pres•
sure gauges and flow meter in series between the gear
pump tee fitting and the spray motor circuit pressure
hose (Fig. 19). Make sure the tester flow control
valve is completely open.
Figure 19
1.
2.
Gear pump
Gear pump tee fitting
3.
4.
Spray circuit hose
Spray circuit relief valve
4.
After installing tester, start engine and run at idle
speed. Check for hydraulic leakage and correct before
proceeding with test.
5.
Adjust engine speed to high idle (3050 – 3150 RPM).
IMPORTANT: The gear pump is a positive displace•
ment type. If gear pump flow is completely re•
stricted or stopped, damage to the gear pump,
tester, or other components could occur.
6.
Watch pressure gauge carefully while slowly closing
the flow control valve on the tester.
7.
System pressure should be approximately 1500 PSI
as the relief valve lifts.
Hydraulic System
Page 4 – 22
Multi Pro 5700–D
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