Toro Groundsmaster 4000-D Service Manual page 71

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 a level surface with the 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 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.
5. Turn steering all the way in one direction and mo-
mentarily hold the steering wheel against resistance.
GAUGE READING TO BE 1350 + 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.
Groundsmaster 4000--D
1. Steering circuit pressure test port
1
1. Steering tower
Page 4 - - 37
1
Figure 26
2
Figure 27
2. Steering relief valve
Hydraulic System (Rev. B)