T R O U B L E S H O O T I N G

HYDRAULIC SYSTEM TROUBLESHOOTING

SYMPTOM

POSSIBLE CAUSES

 

 

UNIT SOUNDS LIKE IT’S

A, B, F, H, or I

WORKING BUT WHEELS

 

DON’T TURN

 

 

 

RUNS BACKWARDS

D or C

 

 

RUNS SLOW

A, B, or I

 

 

JERKING MOTION

B

 

 

WON’T OPEN

C

 

 

FLUID LEAKS

D, E or G

MECHANICAL TROUBLESHOOTING

SYMPTOM

POSSIBLE CAUSES

 

 

UNIT SOUNDS LIKE IT’S

A, C or G

WORKING BUT GATE

 

DOESN’T MOVE

 

 

 

JERKING GATE MOVEMENT

A, C, D, F or G

 

 

SQUEALING SOUND WHEN

B, E or G

GATE MOVES

 

 

 

GATE WON’T STOP IN ONE

H

DIRECTION

 

 

 

DAMAGED DRIVE RAIL

B, D, F or G

 

 

EXCESSIVE WHEEL WEAR

C, F, G, I or A

(A)BYPASS VALVE:

It MUST be in the “automatic” position (horizontal). If it is in the manual position, no fluid gets to the drive motors, so they won’t turn. If the bypass lever is between positions, fluid will be bled off, so motors will turn slower.

(B)PUMP:

Air may be in the system, allow about 15 seconds for air to dissipate. Filter may be clogged. Check fluid level.

(C)DIRECTION VALVE:

Press and hold the manual override button on valve. If unit works okay, check valve for proper wiring. See page 31.

(D)HOSES:

Double-check hose routings between pump and motors. If wrong, fluid will flow in the wrong direction. Check for leaks and/or pin holes.

(E)FITTINGS:

Tighten if required. See page 29.

(F)CHECK VALVE: See page 29.

(G)SEALS:

(H)RELIEF VALVE: See page 29.

(I)FLUID: Check fluid level in tank.

(J)THREE PHASE MOTOR MISWIRED

See page 26, “Motor runs but gate does not move.”

(A)DRIVE WHEELS:

Are the drive wheels slipping? Check the spring tension.

Are the drive wheels wearing excessively? Check the spring tension.

Make sure that the key and bolt holding the drive wheels on are secured.

(B)GUIDE WHEEL:

Check for wheel mis-alignment.

Check guide wheel assembly for interference with drive rail.

(C)DRIVE RAIL:

Check for damage, severe bending or misalignment.

If drive rails were spliced together, check for improper splicing or damaged splices.

(D)PIVOT ARMS:

Make sure that both, upper and lower pivot arms move freely.

(E)SEPARATOR BOLT:

Make sure it’s not interfering with the drive rail.

(F)OPERATOR MOUNTING:

Make sure operator is fastened to pad securely. Check for operator misalignment.

(G)GATE:

Check the gate and its hardware for damage and/or bad rollers.

(H)LIMIT SWITCHES:

Has a lever on one of the limit switches moved or broken. Verify the presence of limit shoes.

(I)SPRINGS:

Check for proper spring tension.

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