Procedure for Steering Circuit Relief Pressure Test
Make sure hydraulic oil is at normal operating tem-
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingdeck
1
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.
Figure 39
Steering circuit pressure test port
1.
3.
Connect a 5000 PSI (350 bar) gauge onto steering
circuit pressure test port (Fig. 39).
4.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
1
5.
Operatetheengineatfullenginespeed (2870RPM).
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.
2
6.
Turn steering all the way in one direction and mo-
mentarily hold the steering wheel against resistance.
GAUGE READING TO BE 1300 to 1400 PSI (90 to
96
bar).
Figure 40
7.
8.
Stop the engine and record test results.
1.
Steering tower
2.
Steering relief valve
If pressure is incorrect, inspect steering relief valve
incontrolvalve(Fig.40).Ifsteeringreliefvalveisoperat-
ing 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.
When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4100--D
Page 4 -- 51
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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|
| Document Type | Service Manual |
| Language | English |
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