Toro Groundsmaster 4100-D Service Manual page 79

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
decks 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 circuit pres-
sure test port (Fig. 30).
4. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5. Operate the engine at 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.
6. Turn steering all the way in one direction and mo-
mentarily hold the steering wheel against resistance.
GAUGE READING TO BE 1350 + 50 PSI.
7. Stop the engine. Record test results.
8. If pressure is incorrect, inspect steering relief valve
(Fig. 31). If steering relief valve is operating properly and
if lift/lower problems also exist, gear pump should be
suspected 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.
9. Disconnect pressure gauge from test port.
Groundsmaster 4100--D
1. Steering circuit pressure test port
1
1. Steering tower
Page 4 - - 37
1
Figure 30
2
Figure 31
2. Steering relief valve
Hydraulic System