Procedure for Lift/Lower Circuit Relief Pressure
Test
10.If reliefvalveadjustmentdoesnotchangereliefpres-
sure, check for restriction in pump intake line, lift cylin-
der(s) internal leakage or gear pump damage.
NOTE: Before attempting to check or adjust lift/lower
circuit relief pressure, make sure that counterbalance
pressure is correctly adjusted (see Counterbalance
Pressure Test in this section).
11.When testing is completed, disconnect pressure
gauge from test port. Install controller cover.
1.
Make sure hydraulic oil is at normal operating tem-
2
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
RIGHT
FRONT
3
1
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingdeck
4
3.
Remove controller cover to gain access to lift/lower
manifold (Fig. 45).
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 45
1.
2.
Controller cover
Screw (2 used)
3.
4.
Flat washer (2 used)
U--nut (2 used)
4.
test port G1 on lift/lower manifold (Fig. 46).
Connect a 5,000 PSI (345 bar) pressure gauge to
5.
at idle speed. Check for hydraulic leakage at pressure
gauge location and correct before proceeding with test.
After installing pressure gauge, start engine and run
1
6.
Sitontheseatandmovethrottle soengine isrunning
at high idle speed (2870 RPM).
7.
While sitting on the seat, depress the rear of the cen-
ter lift switch to fully raise the cutting deck. Momentarily
hold the switch with the deck fully raised while looking
at the gauge.
2
3
GAUGE READING TO BE approximately 2500 PSI
(172
bar).
8.
test results.
Release the lift switch, stop the engine and record
Figure 46
1.
2.
Lift/lower manifold
Test port G1
3.
Relief valve RV1
9.
If specification is not met, clean or adjust relief valve
(RV1) in lift/lower control manifold. Relief valve (RV1) is
locatedonthetopsideofthelift/lowermanifold(Fig.46).
See Adjust Control Manifold Relief Valves in the Adjust-
ments section of this chapter for the valve adjustment
procedure. Recheck relief valve pressure setting after
adjustment.
Groundsmaster 4100--D/4110--D
Page 4 -- 63
Hydraulic System
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