HYDRAULIC SYSTEM TEST PROCEDURES (Cont)

TM 5-2410-233-23

HYDRAULIC SYSTEM TESTS - CONTINUED

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HYDRAULIC SYSTEM TEST PROCEDURES - CONTINUED

Ripper Circuit Drift Tests.

TEST NO. 1: Raise rear of machine off ground by lowering ripper. Put ripper control lever in HOLD position.

Shut off engine and watch for ripper cylinder rods to retract.

TEST NO. 2: Raise rear of machine off ground by lowering ripper. Shut off engine. Hold ripper control lever in

LOWER position. Watch for ripper cylinder rods to retract.

TEST NO. 3: Raise ripper off ground. Put ripper control lever in HOLD position. Shut off engine and watch for

ripper cylinder rods to extend.

TEST NO. 4: Raise ripper off ground. Shut off engine. Hold ripper control lever in RAISE position. Watch for rip-

per cylinder rods to extend.

Ripper Circuit Drift Tests.

TEST RESULTS

MOST PROBABLE CAUSES

Drifting occurs in Tests No. 1 and No. 3

1. Leakage between piston and cylinder.

2. Leakage between ripper circuit valve spool and

body.

Drifting occurs in Tests No. 2 and No. 4

Ripper 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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