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Groundsmaster 4100--D Hydraulic SystemPage 4 -- 41

Procedure for Traction Circuit Reducing Valve (PR)

Pressure Test

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

peraturebyoperatingthemachineforapproximately10

minutes. Make sure the hydraulic tank is full.

2. Parkmachineonalevelsurfacewiththecuttingdeck

loweredandoff.Makesureengineisoffandtheparking

brake is engaged.

CAUTION

Prevent personal injuryand/or damageto equip-

ment. Read all WARNINGS, CAUTIONS and Pre-

cautions for Hydraulic Testing at the beginning

of this section.

3. Connect a 1000 PSI (70 bar) gauge to test port on

4WD control manifold under radiator (Fig. 29).

4. After installingpressure gauge, startengine andrun

at idle speed. Check for hydraulic leakage and correct

before proceeding with test.

5. Operatetheengineatfullenginespeed(2870RPM).

Makesurethattransport/4WDswitchisinthe4WDposi-

tion.

6. Sitonseat,applybrakesfullyandslowlydepressthe

traction pedal in the reverse direction. While pushing

traction pedal, look at pressure reading on gauge:

GAUGE READING TO BE 650 PSI (45 bar)

(approximate).

7. Stop engine and record test results.

8. Pressure reducing valve (PR) is located on thefront

side of the 4WD control manifold (Fig. 30). Adjustment

of this valve can be performed as follows:

NOTE: Do not remove the pressure reducing valve

from the hydraulic manifold for adjustment.

A. To increase pressure setting,remove cap on re-

ducing valve and turn the adjustment socket on the

valveinaclockwisedirection.A1/8turnonthesock-

et will make a measurable change in pressure set-

ting.

B. Todecreasepressuresetting,removecaponre-

ducing valve and turn the adjustment socket on the

valve in a counterclockwise direction. A 1/8 turn on

the s ocket will make a measurable change in pres-

sure setting.

C. Recheck reducing valve (PR) pressure setting

and readjust as needed.

9. Disconnect pressure gauge from test port.

1. 4WD control manifold

2. Pressure test port

Figure 29

1. Manifold: front side 2. Reducing valve (PR)

Figure 30

Hydraulic

System