HYDRAULIC SYSTEM TEST PROCEDURES - TM-5-2410-237-231162

TM 5-2410-237-23

HYDRAULIC SYSTEM TESTS - CONTINUED

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HYDRAULIC SYSTEM TEST PROCEDURES

NOTE

If test results are not as indicated, refer to Troubleshooting for correctitve action.

Blade Lift Circuit Drift Tests. Refer to Table 2 for correct test results for the following checks. Refer to Table 3 to

interpret test results.

Test No. 1. Raise front of tractor off ground by lowering level blade. Put blade control lever in HOLD position.

Shut off engine. Measure lift cylinder rod movement.

Test No. 2. Raise front of tractor off ground by lowering level blade. Shut off engine and hold blade control lever

in LOWER position. Measure lift cylinder rod movement.

Test No. 3. Raise blade off ground. Hold blade control lever in HOLD position. Shut off engine. Measure lift cyl-

inder rod movement.

Test No. 4. Raise blade off ground and shut off engine. Hold blade control lever in RAISE position. Measure lift

cylinder rod movement.

Table 2. Blade Lift Circuit Drift Tests.

MAXIMUM CYLINDER

DURATION OF TEST

OIL TEMPERATURE

MOVEMENT

1.5 in. (38.1 mm)

5 min.

100F (38C)

1.5 in. (38.1 mm)

2.7 min.

135F (57C)

1.5 in. (38.1 mm)

1.7 min.

175F (79C)

Table 3. Interpretation of Blade Lift Circuit Drift Tests.

TEST RESULTS

MOST PROBABLE CAUSES

Drifting occurs in Tests No. 1 and No. 2

Lift circuit make-up valve (head ends) leaking.

Drifting occurs in Test No. 3 and No. 4

Lift circuit make-up valve (rod ends) leaking.

Drifting occurs in Tests No. 2, No. 3 and No. 4

Leakage between pistons and cylinders. Bad piston

valves in cylinders.

Drifting occurs in Tests No. 2 and No. 4

Lift circuit check valve leaking. Leakage between

valve and seat and/or seat and body.

NOTE: Remember that an O-ring seal failure in circuit will have same effect as a major component failure.

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