Toro ProPass 200 Service Manual page 113

11. If gear pump flow is less than 5.2 GPM (19.7 LPM),
check system relief valve for possible leakage as fol-
lows:
A. Leave hydraulic tester (pressure and flow) in-
stalled as listed above. Make sure flow control valve
on tester is fully open.
B. Start power pack engine and run at high idle
speed (3750 RPM).
IMPORTANT: Close flow control valve on tester
only enough to get a system relief pressure read-
ing.
IMPORTANT: Do not fully restrict oil flow
through tester. In this test, the flow tester is posi-
tioned before the relief valve. Pump damage can
occur if the oil flow is fully restricted.
C. Watch pressure gauge carefully while slowly
closing the tester flow control valve until the relief
valve opens.
D. System pressure should be approximately 2000
PSI (138 bar) as the relief valve lifts.
ProPass 200
E. When relief valve pressure has been determined,
open control valve on tester, move throttle to low idle
speed and shut off engine. Record relief valve pres-
sure test results.
F. If relief valve pressure needs adjustment, see Ad-
just Manifold Relief Valve in the Adjustments section
of this chapter. If adjustments to the relief valve do
not change the relief pressure, consider that the re-
lief valve cartridge is leaking or damaged which may
also affect the gear pump flow measured above.
12.If gear pump flow reading (from step 10 above) is low
and relief valve operation is normal:
A. Check gear pump suction line for restriction.
B. Check gear pump flow at gear pump fitting (see
Hydraulic Power Pack Gear Pump Flow in this sec-
tion).
13.When testing is complete, disconnect tester from the
hydraulic hose and manifold fitting. Reconnect hose to
manifold fitting.
Page 6 - - 9 Hydraulic Power Pack