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Groundsmaster 4000--D Hydraulic System (Rev. B)Page 4 -- 37
Procedure for Steering Circuit Relief Pressure Test
1. 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.
2. Park machine on alevel surface withthe cutting units
lowered and off. Make sure engine is off and the parking
brake is engaged.
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. Connect a 5000 PSI gauge onto steering pressure
test port.
4. Start the engine and move throttle to full engine
speed (2730 +
30 RPM).
IMPORTANT: Hold s teering 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.
5. Turn steering all the way in one direction and mo-
mentarily hold the steering wheel against resistance.
GAUGEREADINGTOBE1350 +
50 PSI.
6. Stop the engine.
7. If pressure is incorrect, inspect steering relief valve
(Fig. 27). If relief valve is operating properly and if lift/
lower problems also exist, gear pump should be sus-
pected of wear and inefficiency. If steering wheel
continues to turn at end of cylinder travel (with lower
than normal effort), steering cylinder or steering valve
should be suspected of wear or damage.
1. Steering circuit pressure test port
Figure 26
1
1. Steering tower 2. Steering relief valve
Figure 27
2
1
Hydraulic
System