Procedure for Steering Circuit Relief Pressure Test
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
1.
2
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
1
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.
Figure 37
1.
Steering circuit test port
2.
Gear pump
3.
Raise seat to gain access to steering circuit test port
located on thefront end of the gear pump (Fig. 37).Con-
nect a 5000 PSI gauge onto steering circuit test port.
Route gauge hose to allow seat to be safely lowered.
4.
Start the engine and move throttle to full engine
speed (2800 + 50 RPM).
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system pressure reading.
Holding the steering wheel against the stop for an
extended period will damage the steering motor.
2
5.
Turn steering all the way in one direction and mo-
mentarily hold the steering wheel against resistance.
3
1
GAUGE READING TO BE 1150 TO 1500 PSI.
Figure 38
6.
7.
Stop the engine.
1.
2.
Steering control valve
Steering column
3.
Steering relief valve
If pressure is incorrect, inspect steering relief valve
located in the steering control valve (Fig. 38). If relief
valveisoperatingproperlyandiflift/lower problemsalso
exist,gearpumpshouldbesuspectedofwearandineffi-
ciency.Ifsteering wheelcontinues toturnatendofcylin-
der travel (with lower than normal effort), steering
cylinder or steering control valve should be suspected
of wear or damage.
Groundsmaster 4500--D/4700--D
Page 4 -- 39
Hydraulic System (Rev. A)
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