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Groundsmaster 4100--D Hydraulic SystemPage 4 -- 37

Procedure for Counterbalance 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. Remove console cover.

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. Determine system charge pressure (see Traction

Circuit Charge Pressure in this chapter).

4. Connect a 1000 PSI (70 bar) gauge to counterbal-

ance test port on manifold under console (Fig. 25).

5. After installingpressure gauge, startengine andrun

at idle speed. Check for hydraulic leakage and correct

before proceeding with test.

6. Operatetheengine atfull enginespeed(2870 RPM)

withnoload onthesystem.Do notengage the cutting

deck.

GAUGE READING TO BE 225 PSI (15.5 bar) over

systemcharge pressure (e.g.ifchargepressureis

250PSI(17.2 bar),counterbalancepressure should

be 475 PSI (32.7 bar)).

7. Stop the engine and record test results.

8. Adjustment of the counterbalance valve can be per-

formed as follows:

NOTE: Do not remove the counterbalance valve

from the hydraulic manifold for adjustment.

A. Loosen locknut on counterbalance valve (Fig.

25).

B. To increase pressure setting, turn the adjust-

ment screw on the valve in a clockwise direction. A

1/8turnonthescrewwillmakeameasurablechange

in counterbalance pressure.

C. To decrease pressure setting, turn the adjust-

mentscrewonthevalveinacounterclockwisedirec-

tion.A 1/8turn onthe screw willmake ameasurable

change in counterbalance pressure.

D. Tighten locknut to secure adjustment. After ad-

justment, recheck counterbalance pressure. Re-

adjust as needed.

9. When testing is completed, disconnect pressure

gauge from test port.

1. Counterbalance test port

2. Counterbalance valve

3. Locknut

4. Adjusting screw

Figure 25

Hydraulic

System