Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 43
The lower cutting units relief valve (RV) pressure test
should be performed to make sure that the relief pres-
sure for lowering the cutting units is correct.
Procedurefor LowerCutting Units ReliefValve (R
V)
Pressure
Test:
1. Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
(10) minutes.
2. Parkmachineonalevelsurfacewiththecuttingunits
lowered. Make sure engine is off and the parking brake
is engaged. Make sure the hydraulic tank is full.
CAUTION
Prevent personal injuryand/or damageto equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing a t the beginning
of this section.
NOTE: The lower cutting units relief valve is in series
with the traction charge relief valve. C harge relief pres-
sure will affect the lower cutting units relief pressure.
3. Measure and record charge relief valve pressure
(see ChargeReliefValve PressureTestinthis section).
4. Remove right side cover next to operator seat to al-
low access to lift control manifold.
5. Install 1000 PSI (70 bar) pressure gauge with hy-
draulichoseattachedtoliftcontrolmanifoldtestport(G)
(Fig. 23).
6. After installingpressuregauge, startengine andrun
at low idle speed. Check for hydraulic leakage and cor-
rect before proceeding with test.
7. Movethrottlesoengineisrunningathighidlespeed.
NOTE: The lower cutting units function is electrically
timed and automatically turns off after approximately
three (3) seconds.
8. Watch pressure gauge carefully while moving the
joystick to LOWER and note pressure that relief valve
opens.Releasejoystick,shutoffengineand recordtest
results.
NOTE: While performing this hydraulic test, if relief
pressurecannotbedeterminedwithintheLOWERfunc-
tion three ( 3) second timeframe, repeat this test proce-
dure.
9. The lower cutting units relief pressure should be
approximately 400 PSI (27.6 bar) higher than charge
relief pressure (e.g. if charge relief v alve pressure is
125PSI(8.6bar),the lowerreliefvalvepressureshould
be approximately 525 PSI (36.2 bar)).
10.If the lower relief valve pressure is incorrect, adjust
lower cutting units relief valve on lift c ontrol manifold
(Fig. 24) (see Adjust Manifold Relief Valves in the Ad-
justments section of this Chapter). Retest relief valve
pressure after adjustment is performed.
NOTE: Thesteering/liftc ircuit reliefvalvepressurecan
also be measured with pressure gauge positioned as
described in this test (see Steering/Lift Relief Valve
Pressure Test in this section).
11.When testing is complete, disconnect pressure
gaugefromliftcontrolmanifoldtestport.Installdustcap
to test port fitting. Install right side cover.
1. Lift control manifold 2. Test port
Figure 23
2
1
Figure 24
FRONT
S3
S1
S4
RELIEF
VALVE (RV)
S2
LIFT CONTROL
MANIFOLD
Hydraulic
System
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