Rev.AGroundsmaster 4100 --D/4110--D Hydraulic SystemPage 4 -- 47
ProcedureforRearTractionCircuit(RV)ReliefPres-
sure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
2. Parkmachineonalevelsurfacewiththecuttingdeck
loweredandoff.Makesureengineis offandtheparking
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. Measure and record traction circuit pressure redu-
cing valve (PR) pressure (see Traction Circuit Pressure
Reducing Valve (PR) Pressure Test in this section).
4. Connect a 1000 PSI (70 bar) pressure gauge to test
port on 4WD manifold under radiator. This is the same
pressuregaugepositionasusedtom easuretractioncir-
cuit pressure reducing valve (PR) pressure.
5. After installing pressure gauge, start engineand run
at idle speed. Check for hydraulic leakage at pressure
gauge location and correct before proceeding with test.
6. Move throttle so engine is runningat high idle speed
(2870 RPM).
7. Operate the machine in Low speed (4WD) with the
cuttingdecklowered.Drivedownaslopeinaforwarddi-
rection, decrease pressure on the traction pedal and
monitor the pressure gauge. Pressure should increase
until the rear traction relief valve (RV) lifts. Record test
results.
8. Stop engine and record test results.
9. Relief (RV) pressure should be approximately 750
PSI (52 bar) and at least 100 PSI (7 bar) higher than
the traction circuit pressure reducing valve (PR)
pressure(e.g.ifthepressure reducingvalve(PR)pres-
sure is 650 PSI (45 bar), relief (RV) p ressure should be
at least 750 (52 bar) but not much higher).
10.If specification is not met,cleanoradjust relief valve
(RV) in 4WD control manifold. Relief valve (RV) is lo-
cated on the lower, front side of the 4WD control man-
ifold( Fig.35).SeeAdjustControlManifoldReliefValves
in the Adjustments section of t his chapter for the valve
adjustment procedure. Recheck relief valve (RV) pres-
sure setting after adjustment and readjust as needed.
11.When testing is completed, disconnect pressure
gauge from manifold test p ort.
1. 4WD control manifold 2. Pressure test port
Figure 34
1
2
1. Manifold: front side 2. Relief valve (RV)
Figure 35
1
2
Hydraulic
System
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