4.
hydraulic pump assembly.
Raise and support operator seat to allow access to
NOTE: If gear pump (P3) is worn or damaged, both
charge circuit and steering circuit will be affected.
5.
Thoroughly clean ends of hydraulic tubes that con-
12.After charge pressure testing is completed, make
sure that engine is not running and then relieve hydrau-
lic system pressure (See Relieving Hydraulic System
Pressure in the General Information section of this
chapter). Remove pressure gauge and tee fitting from
hydraulic tubes. Install oil filter to machine.
nect to the oil filter (Fig. 37). Disconnect hydraulic tubes
from oil filter adapter. Remove two (2) flange head
screwsthatsecureoilfilteradapter toframe andremove
oil filter and adapter assembly from machine.
6.
Install tee fitting with 1000 PSI (70 bar) pressure
gauge in place of the removed hydraulic filter assembly.
13.Lower and secure operator seat.
7.
ing wheel is stationary and parking brake is engaged.
Make sure that traction pedal is in neutral, the steer-
8.
draulic leakage from test connections and correct be-
fore proceeding with test.
Start engine and run at idle speed. Check for any hy-
9.
Place throttle to full speed (3200 RPM) and monitor
2
pressure gauge on tester.
1
GAUGE READING TO BE approximately 200 to
250
PSI (13.8 to 17.2 bar)
10.Next,
determine charge pressure under traction load
byoperatingthemachineinadirectforwardandreverse
direction (not steering). Make sure that engine is run-
ning at full speed (3200 RPM). Apply the brakes and
pressthetractionpedalintheforwarddirection andthen
to reverse while monitoring the pressure gauge. Stop
engine and record test results.
3
Figure 37
1.
2.
Hydraulic tube
3.
Hydraulic tube
Oil filter / filter adapter
2
GAUGE READING TO BE approximately 150 to
3
250
PSI (13.8 to 17.2 bar)
4
5
11.
Compare measured charge pressure from step 9
with pressure from step 10:
6
A. If charge pressure is good under no load (step 9),
but drops below specification when under traction
load (step 10), the piston pump should be suspected
of wear and inefficiency. When the pump is worn or
damaged, the charge system is not able to replenish
losttraction circuitoilduetoexcessive leakage inthe
worn pump.
1
RIGHT
FRONT
B. If there is no charge pressure, or pressure is low,
check for restriction ingear pumpintake line.Inspect
charge relief valve and valve seat in the traction
pump (see TractionPumpService inthe Service and
Repairs section of this chapter). Also, consider a
worn or damaged gear pump (P3) (see Gear Pump
(P3) Flow Test in this section).
Figure 38
4.
5.
6.
1.
2.
3.
Traction pump
Plug
O--ring
Shim kit
Spring
Charge relief poppet
Groundsmaster 4300--D
Page 4 -- 37
Hydraulic System
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