User manual
Groundsmaster 4000 --D/4010--D Hydraulic SystemPage 4 -- 61
Procedure for Steering Circuit Relief Pressure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
2. Park machine on a lev el surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.
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.
3. Locate steering circuit pressure test port and con-
necta5000PSI(350bar)pressuregaugeontotestport.
A. On Groundsmaster 4000--D machines, the test
port is located on the steering supply hydraulic tube
under the front of the machine (Fig. 48).
B. On Groundsmaster 4010--D machines, the test
port is located on the steering supply hydraulic tube
under the operator seat (Fig. 49).
4. Starttheengineandmovethrottletohighidleengine
speed (2870 RPM).
IMPORTANT: Hold steering wheel at full lock only
longenoughtogetasystemreliefpressurereading.
Holding the steering wheel against the stop for an
extended period can damage the steering control
valve.
5. Turn steering all the way in one direction and mo-
mentarily hold the steering wheel against resistance.
GAUGE READING TO BE 1300 to 1400 PSI (90 to
96 bar).
6. Stop the engine and record test results.
7. If pressure is incorrect, inspect steering relief valve
in steering control valve (see Steering Control Valve in
the Service and Repairs section of this chapter). If relief
valveisoperatingproperlyandiflift/lowerproblemsalso
exist, flow divider in fan manifold and/or gear pump
(third section) should be suspected of wear and ineffi-
ciency.Ifsteeringwheelcontinuestoturnatendofcylin-
der travel (with lower than normal effort), steering
cylinder or steering control valve should be suspected
of wear or damage.
8. When testing is completed, disconnect pressure
gauge from test port.
1. Steering circuit pressure test port (GM4000--D)
Figure 48
1
Figure 49
1. Steering circuit pressure test port (GM4010--D)
1
Hydraulic
System