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Page Title:
HYDRAULIC SYSTEM TEST PROCEDURES |
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 TM 5-2410-233-23
HYDRAULIC SYSTEM TESTS - CONTINUED
0167 00
HYDRAULIC SYSTEM TEST PROCEDURES - CONTINUED
2.
Lift Circuit Drift Tests.
a.
TEST NO. 1: Raise front of machine off ground by lowering a level blade. Put blade control lever in HOLD posi-
tion. Shut off engine and watch for lift cylinder rods to retract.
b.
TEST NO. 2: Raise front of machine off ground lowering a level blade. Shut off engine. Hold blade lever in
LOWER position. Watch for lift cylinder rods to retract.
c.
TEST NO. 3: Raise blade off ground. Put blade control lever in HOLD position. Shut off engine and watch for lift
cylinder rods to extend.
d.
TEST NO. 4: Raise blade off ground. Shut off engine. Hold blade control lever in RAISE position. Watch for lift
cylinder rods to extend.
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.
3.
Tilt Circuit Drift Tests (Left-Side Cylinder).
a.
TEST NO. 1: Put blade flat on ground. Raise front of machine off ground by lowering right side of blade (TILT
RIGHT). Put tilt circuit in HOLD position. Shut off engine and watch for tilt cylinder rod to retract.
b.
TEST NO. 2: Put blade flat on ground. Raise front of machine off ground by lowering right side of blade (TILT
RIGHT). Shut off engine. Put tilt circuit in TILT RIGHT position. Watch for tilt cylinder rod to retract.
c.
TEST NO. 3: Put blade flat on ground. Raise front of machine off ground by lowering left side of blade (TILT
LEFT). Put tilt circuit in HOLD position. Shut off engine and watch for tilt cylinder rod to extend.
d.
TEST NO. 4: Put blade flat on ground. Raise front of machine off ground by lowering left side of blade (TILT
LEFT). Shut off engine. Put tilt circuit in TILT LEFT position. Watch for tilt cylinder rod to extend.
Tilt Circuit Drift Tests (Left-Side Cylinder).
TEST RESULTS
MOST PROBABLE CAUSES
Drifting occurs in Tests No. 1 and No. 3
1. Leakage between piston and cylinder.
2. Leakage between tilt circuit valve spool and body.
Drifting occurs in Tests No. 2 and No. 4
Tilt 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.
0167 00-4
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