user manual

Groundsmaster 4100--D Hydraulic SystemPage 4 -- 51

Procedure for Steering Circuit Relief 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 5000 PSI (350 bar) gauge onto steering

circuit pressure test port (Fig. 39).

4. After installingpressure gauge, startengine andrun

at idle speed. Check for hydraulic leakage and correct

before proceeding with test.

5. Operatetheengineatfullenginespeed(2870RPM).

IMPORTANT: Hold steering wheel at full lock only

long enough to get a system pressure reading.

Holding the steering wheel against the stop for an

extended period will damage the steering motor.

6. Turn steering all the way in one direction and mo-

mentarily hold the steering wheel against resistance.

GAUGE READING TO BE 1300 to 1400 PSI (90 to

96 bar).

7. Stop the engine and record test results.

8. If pressure is incorrect, inspect steering relief valve

incontrolvalve(Fig.40).Ifs teeringreliefvalveisoperat-

ing properly and if lift/lower problems also exist, gear

pump should be suspected of wear and inefficiency. If

steeringwheelcontinuestoturnatendofcylindertravel

(with lower than normal effort), steering cylinder or

steeringvalve shouldbesuspectedofwear ordamage.

9. When testing is completed, disconnect pressure

gauge from test port.

1. Steering circuit pressure test port

Figure 39

1. Steering tower 2. Steering relief valve

Figure 40

Hydraulic

System