Service Manual

ManualsBrandsToro ManualsRiding ProductsReelmaster 7000-D 4-Wheel Drive Traction Unit

Reelmaster 7000 Hydraulic System

Page 4 -- 45

NOTE: Adjustable relief valve (RV) in the 4WD/2WD

control manifold reduces rear axle motor pressure

created in down hill, dynamic braking conditions to pre-

vent rear wheel lock up.

Procedurefor Rear Traction Circuit Relief (RV) Pres-

sure Test

1. Make sure hydraulic oil is at normal operating tem-

peraturebyoperatingthemachinefor approximatelyten

(10) minutes. Make sure the hydraulic tank is full.

2. Parkmachine on alevel surface withthe cutting units

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

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

fitting(portG) onrearside of4WD/2WDcontrolmanifold

under front of machine (Figs. 34 and 35). This is the

same pressure gauge position as usedto measure trac-

tion circuit pressure reducing valve (PR) pressure.

5. After installing pressure gauge, start engine and run

at low idle speed. Check for hydraulic leakage and cor-

rect before proceeding with test.

6. Move throttle to high idle speed (2850 RPM).Make

sure that mow speed limiter is in the mow (4WD) posi-

tion. Release parking brake.

7. Operate the machine in mow speed (4WD) with the

cuttingunitslowered.Drivedownaslopeinaforwarddi-

rection and decrease pressure on the traction pedal

whilecarefully monitoring thepressure gauge. Pressure

should increase until relief valve (RV) lifts.

8. Stop engine and record test results.

9. Relief (RV) pressure should be at least 100 PSI (7

bar) higher than the traction circuit pressure redu-

cing valve (PR) pressure and also be between 5 20

and 570 PSI (36 to 39 bar) (e.g. if thepressure reducing

valve(PR) pressure is450 PSI (31 bar), relief (RV) pres-

sure should be from 550 to 570 PSI (38 to 39 bar)).

NOTE: Rear traction circuit relief (RV) pressure should

be at least 100 PSI (7 bar) higher than traction circuit re-

ducing (PR) pressure. If the difference in these pres-

sures is less than 100 PSI (7 bar), reverse traction

performance may be affected.

10.If specification is not met, clean or adjust relief valve

(RV) which is located on the left side of the 4WD/2WD

controlmanifoldin theRVport (Fig.34) (see AdjustCon-

trol Manifold Relief Valves in the Adjustments section of

this chapter for valve adjustment procedure). Recheck

relief (RV) pressure after adjustment.

11.When testing is completed, disconnect pressure

gauge from test port. Install dust cap to test port fitting.

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

Figure 34

FRONT

RIGHT

1. 4WD/2WD manifold 2. Test fitting (port G)

Figure 35

Hydraulic

System