Greensmaster 3300/3400 Hydraulic SystemPage 5 -- 41
Thesteering/lift reliefvalvepressuretest shouldbeper-
formed to make sure that the relief pressure for the
steering and lift circuits is correct.
Procedure for Steering/Lift Relief Valve 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 injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and P re-
cautions for Hydraulic Testing at the beginning
of this section.
NOTE: The steering/lift relief valve is in series with the
traction charge relief valve. Traction charge pressure
will therefore affect steering/lift relief valve pressure.
3. Measure and record charge relief valve pressure
(see Charge Relief Valve Pressure Test in this section).
4. Remove right side cover next to operator seat to al-
low access to lift control manifold.
5. Install 5000 PSI (350 bar) pressure gauge with hy-
draulichoseattachedtoliftcontrolmanifoldtestport(G)
(Fig. 22).
6. Makesurethattractionpedalandjoystickareinneu-
tral and t he parking brake is engaged.
7. Start engineand runat lowidlespeed.Check forhy-
draulicleakageand correctbeforeproceedingwithtest.
8. Movethrottlesoengineisrunningathighidlespeed.
CAUTION
While measuring steering/lift relief valve pres-
sure, do not allow circuit pressure to exceed
1400 PSI (82.8 bar).
9. Watch the pressure gauge and move the joystick to
theraiseposition.M omentarilyholdthejoystickwiththe
cuttingunits fully raisedcausingthe reliefvalve toopen.
Release the joystick when the relief pressure is identi-
fied.
10.Shut off engine. Record pressure at which t he relief
valve opens.
11.Steering/liftvalve pressureshould beapproximately
1160 PSI (80 bar) higher than the charge relief valve
pressure (e.g.ifthechargerelief valve pressure is 125
PSI(8.6bar),thesteering/lift relief valve pressure
should be approximately 1285 PSI (88.6 bar)).
12.If steering/lift relief valve pressure is incorrect, in-
spect relief valve located in the power steering valve
(see Power Steering Valve Service in the Service and
Repairs section of this Chapter). Clean relief valve or
service power steering valve as needed.
NOTE: The lower cutting units relief valve (RV) pres-
sure can also be measured with pressure gauge posi-
tionedas describedinthistest(see LowerCuttingUnits
Relief Valve (RV) Pressure Test in this section).
13.When testing is complete, disconnect pressure
gaugefromliftcontrolmanifoldtestport.Installdustcap
to test port fitting. Install right side cover.
1. Lift control manifold 2. Test port
Figure 22
2
1
Hydraulic
System
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