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Groundsmaster 4100--D Hydraulic SystemPage 4 -- 45
Procedure for Cutting Deck Manifold Relief
Pressure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2. Parkmachineon a level surface with thecuttingdeck
lowered and off. Make sure engine is off and the parking
brake is engaged.
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.
3. Locate deck manifold to be tested (Fig. 34). Discon-
nect hydraulic hose at deck manifold port (M1).
NOTE: Analternative to using manifold port (M1)would
be to disconnect the inlet hydraulic hose at deck motor.
4. Install tester with pressure gauges and flow meter in
series with the the disconnected hose and hydraulic
manifold port (M1) (or motor inlet if hose was discon-
nected at deck motor).
5. Make sure the flow control valve on tester is fully
open.
6. After installing tester, start engine and run at idle
speed. Check for hydraulic leakage and correct before
proceeding with test.
CAUTION
Keep away from deck during test to prevent per-
sonal injury from the cutting blades.
7. Operate engine at full speed (2870 RPM). Engage
the cutting deck.
8. Watch pressure gauge carefully while slowly closing
the flow control valve to fully closed.
9. As the relief valve lifts, system pressure should be
approximately:
2900 to 3100 PSI (200 to 213 bar) for the center
deck and LH wing deck
1900 to 2100 PSI (131 to 144 bar) for the RH wing
deck
10.Disengage cutting deck. Shut off engine and record
test results.
11.If specification is not met, adjust or clean relief valve
in deck manifold port (RV1). Adjust relief valve as fol-
lows:
NOTE: Do not remove valve from the hydraulic
manifold for adjustment.
A. Remove cap on relief valve with an allen wrench.
B. To increase pressure setting, turn the adjust-
ment screw on the valve in a clockwise direction. A
1/8turnon thescrewwill makeameasurable change
in relief pressure.
C. To decrease pressure setting, turn the adjust-
ment screw on the valve in a counterclockwisedirec-
tion. A 1/8 turn on the screw will make a measurable
change in relief pressure.
D. Install and tighten cap to secure adjustment. Re-
check relief pressure and readjust as needed.
12.Disconnect tester from manifold and hose. Recon-
nect hydraulic hose that was disconnected for test pro-
cedure.
1. Center deck manifold
2. LH wing deck manifold
3. RH wing deck manifold
Figure 34
FRONT
RIGHT
TO OIL COOLER
1
2
3
1. Deck manifold
2. Relief valve
3. Relief valve cap
Figure 35
1
2
3
FRONT DECK MANIFOLD SHOWN
Hydraulic
System