Groundsmaster 4300--D Hydraulic SystemPage 4 -- 57
The steering relief valve (R10) pressure test should be
performed to make sure that the steering circuit relief
pressure is correct.
Procedure for Steering Relief Valve Pressure
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes.
2. Park machine on a level surface with the cutting
deckslowered andPTOswitch off.Makesureengine is
off. Apply the parking brake.
3. Read Precautions For Hydraulic Testing in this sec-
tion.
CAUTION
Beforeopeninghydraulicsystem,operateallhy-
draulic controls to relieve system pressure and
avoid injury from pressurized hydraulic oil. See
RelievingHydraulicSystemPressurein theGen-
eral Information section of this chapter.
4. Thoroughlycleantheareaaroundthehydraulichose
at the rod end of the steering cylinder (Fig. 60).
5. Remove hydraulic hose from the fitting on the rod
end of the steering cylinder.
6. Installateefittingbetweenthedisconnectedhydrau-
lic hose and the steering cylinder fitting. Install a 5000
PSI (350 bar) pressure gauge to the tee fitting.
7. After installingpressure gauge, startengine andrun
atidlespeed. Checkforany hydraulicleakagefrom test
connections and correct before proceeding with test.
8. Move throttle to full speed (3200 RPM) .
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system pressure reading.
Holding the steering wheel against the stop for an
extended period may damage the steering control
valve.
9. Watch pressure gauge carefully while turning the
steering wheel for a left hand turn (counter--clockwise)
and holding.
10.Systempressureshould beapproximately 1000PSI
(70bar)asthereliefvalvelifts.Returnsteeringwheelto
the neutral position.
11.Shut off engine. Record test results.
12.If specification is not met, inspect steering control
valve(seeSteeringControlValveServiceintheService
and Repairs section of this chapter).
13.After testing is completed, make sure that engine is
stopped, then relieve hydraulic system pressure (see
RelievingHydraulic SystemPressure intheGeneralIn-
formation section of this chapter). Remove tee fitting
and pressure gauge from hydraulic hose and steering
cylinder.Connect hydraulichoseto steeringcylinderfit-
ting.
1. Steering cylinder 2. Rod end fitting
Figure 60
1
2
Hydraulic
System
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