caution - Toro

Procedure for Steering Circuit Relief Pressure Test
1. Make sure hydraulic oil is at normal operating temperature
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 deck
lowered and off. Make sure engine is off and the parking
brake is engaged.
CAUTION
Prevent personal injury and/or damage to equipment.
Read all WARNINGS, CAUTIONS and Precautions
for Hydraulic Testing at the beginning
of this section.
Figure 39
1. Steering circuit pressure test port
1
3. Connect a 5000 PSI (350 bar) gauge onto steering
circuit pressure test port (Fig. 39).
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 (2870 RPM).
1
Hydraulic
System
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 momentarily
hold the steering wheel against resistance.
GAUGE READING TO BE 1300 to 1400 PSI (90 to
96 bar).
7. Stop the engine and record test results.
8. If pressure is incorrect, inspect steering relief valve
in control valve (Fig. 40). 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.
Figure 40
1. Steering tower 2. Steering relief valve
2
9. When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4100--D
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Hydraulic System