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ManualsBrandsToro ManualsEngineFitness Equipment 4014-D

Rev.AGroundsmaster 4000 --D/4010--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. Park machine on a lev el surface with the cutting

decks lowered and off. Make sure engine is off and the

parking brake is applied.

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. Start the engine and put throttle at high idle speed

(2870RPM).Makesurethat Hi/Low switch isinthe Low

(4WD) position.

6. Operate the machine in Low speed (4WD) with the

cutting decks lowered. Drivedownaslopeinaforward

direction, decrease pressure on the traction pedal and

monitor the pressure gauge. Pressure should increase

until the relief valve lifts.

7. Stop engine and record test results.

8. 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).

9. Relief valve (RV) is located on the front side of the

4WD manifold (Fig. 35). Adjustment of the relief valve

(RV)canbeperformedasfollows:

NOTE: Do not remove the reliefvalvefrom the hydrau-

lic manifold for adjustment.

A. Remove cap on relief valve to locate the adjust-

ment socket (Fig. 36). A 1/8 turn on the socket will

makeameasurablechangeinreliefpressure.

B. Toincreasereliefpressuresetting, rotateadjust-

ment socket in a clockwise direction.

C. To decrease pressure setting, rotate adjustment

socket in a counterclockwise direction.

D. Recheck relief pressure and readjustasneeded.

10.When testing is completed, disconnect pressure

gauge from manifold test p ort.

1. 4WD manifold (front) 2. Relief valve (RV)

Figure 35

Figure 36

1. Relief valve cap 2. Adjustment socket

Hydraulic

System