Toro Groundsmaster 4500-D Series Service Manual page 174

Procedure for Steering Circuit Relief Pressure Test
Hydraulic System: Testing
The steering circuit relief pressure test should be performed to make sure that
the steering circuit relief pressure is correct.
Prevent personal injury and/or damage to equipment. Read all
WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the
beginning of this section.
1. Make sure hydraulic oil is at normal operating temperature by operating
the machine for approximately ten (10) minutes. Make sure the hydraulic
reservoir 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.
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1. Steering cylinder
2. Barrel end hose
3. Thoroughly clean junction of hydraulic hose and steering cylinder fitting at
the barrel end of the steering cylinder
fitting in barrel end of steering cylinder.
4. Install 350 bar (5000 PSI) pressure gauge with hydraulic hose attached to
disconnected hose. Install steel cap on steering cylinder fitting to prevent
any leakage from cylinder.
5. After installing pressure gauge, start engine and run at low idle speed. Check
for hydraulic leakage and correct before proceeding with test.
6. Increase engine speed to high idle speed.
While testing, rotate steering wheel only long enough to get a system
relief pressure reading. Holding the steering circuit at relief pressure
for an extended period may damage the steering control valve.
7. Turn steering wheel to the right while monitoring the pressure gauge. When
steering circuit pressure reaches the relief pressure setting, pressure should
CAUTION
Figure 83
3. Barrel end fitting
4. Rear axle
(Figure
IMPORTANT
Page 5–72
83). Disconnect hose from
Groundsmaster ® 4500-D/4700-D
19245SL Rev A