6.
allow flow through the traction circuit. Support machine
with jackstands or blocking.
Lift or jack machine so all wheels are off the floor to
14.While holding trunnion shaft fully counter–clockwise,
close flow control valve on tester until pressure gauge
reads 1000 PSI. As flow control valve is being closed,
engine speed will drop to approximately 3200 RPM.
Verify that pump speed is approximately 2500 RPM with
a phototac. Observe flow gauge.
7.
and something immovable in the shop to prevent the
machine from moving during testing.
Attach a heavy chain to the rear of the machine frame
TESTER READING: A pump in good condition
should have a flow of approximately 9.5 GPM
CAUTION
15.Open
flow control valve on tester, return trunnion
shaft to the neutral position and turn off engine. Record
results of hydraulic flow test.
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil.
16.If
flow is less than 7.6 GPM or a pressure of 1000 PSI
cannot be obtained, consider that a pump problem ex-
ists.
8.
from the lower 45o fitting on the rear side of the traction
pump (Fig. 19).
Clean hose fitting and disconnect hydraulic hose
NOTE: Forward traction circuit relief pressure can be
determined with the same tester connections as this
test. See TEST NO. 4: Traction Circuit Relief Pressure.
NOTE: An alternate testing location would be at the hy-
draulic hose connection to the P1 port of the front wheel
motor.
17.When testing is complete, disconnect tester from
lower 45o fitting and hydraulic hose. Reconnect hose to
fitting. Secure pump control assembly to traction pump
(see Hydraulic (Traction/Charge) Pump Installation in
the Service and Repairs section of this chapter).
IMPORTANT: Make sure oil flow indicator arrow on
the flow meter is showing that the oil will flow from
the traction pump, through the tester and into the
disconnected hose.
2
9.
Install hydraulic tester with flow meter and pressure
gauges in series with the traction pump and the discon-
nected hose. Make sure flow control valve on the
tester is fully open.
10.Check
and adjust the oil level in the reservoir after
connecting hydraulic tester.
11.
another person reads the tester.
One person should operate the machine while
1
12.Start
and run engine at full speed (3400 + 50 RPM).
CAUTION
Figure 19
2.
1.
Lower 45o fitting
Hydraulic hose
Use extreme caution when conducting test. The
wheels of the machine will be trying to move the
machine forward.
IMPORTANT: Do not rotate the traction pump trun-
nion shaft clockwise (reverse) during testing.
13.Using
a wrench, slowly rotate traction pump trunnion
shaft counter–clockwise to the fully forward position.
ProCore 648
Page 4 – 23 Rev. B
Hydraulic System
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