Procedure for Lift/Lower Circuit Relief Pressure
Test
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
2
1
CAUTION
Figure 39
2.
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.
1.
Lift circuit test port
Gear pump
2
1
3.
Raise seat to gain access to lift circuit test port lo-
cated on the front end of the gear pump (Fig. 39). Con-
nect a 5000 PSI gauge onto lift circuit test port. Route
gauge hose to allow seat to be safely lowered.
4.
Sit on the seat and start the engine. Move throttle to
full speed (2800 + 50 RPM).
3
5.
While sitting on the seat, pull lift lever back to raise
3
the cutting units. Momentarily hold the lever with the lift
cylinder at full extension while looking at the gauge.
Figure 40
GM 4500--D control manifold
GM 4700--D control manifold
Lift/lower relief valve
1.
2.
3.
GAUGE READING TO BE 2000 to 2600 PSI.
6.
7.
located on the side of power down and traction assist
control manifold under operator seat (Fig. 40).
Stop the engine.
If specification is not met, adjust or clean relief valve
A. If pressure is too high, remove cap on relief valve
(Fig. 41). Adjust relief valve by rotating adjustment
socket counterclockwise (decreasing relief pres-
sure).
1
B. If pressure is too low, check for restriction in gear
pump intake line. Check the lift cylinders for internal
leakage. If pump intake line is not restricted and lift
cylinders are not leaking, remove cap on relief valve
(Fig. 41). Adjust the relief valve by rotating adjust-
ment socket clockwise (increasing relief pressure).
2
C. If pressure is still too low after relief valve adjust-
ment, pump or lift cylinder(s) should be suspected of
wear, damage or inefficiency.
Figure 41
1.
Relief valve cap
2.
Adjustment socket
Groundsmaster 4500--D/4700--D
Page 4 -- 41
Hydraulic System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
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| Document Type | Service Manual |
| Language | English |
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