MAINTENANCE

Troubleshooting

POSSIBLE TROUBLE

CAUSES

REMEDIES

Motor turns while unloaded

Scored backplate.

Remove backplate and examine

but slows down or stops when

 

surface condition of flat area; if scored,

load is applied

 

replace backplate. DO NOT LAP.

 

Scored or worn piston shoes.

Disassemble motor, examine condition

 

 

of shoes on pistons; replace pistons as

 

 

a complete set if necessary. DO NOT

 

 

LAP

 

Low Relief Valve pressure.

Check Relief Valve for proper pressure

 

 

setting; adjust pr replace Relief Valve.

Motor will not turn.

Severely scored backplate.

Disassemble motor completely.

 

 

Inspect all parts, clean all parts,

 

 

replace all worn parts and flush

 

 

hydraulic system.

Motor free wheels.

Oil-flow and pressure shut off

When the hydraulic system is shut off,

 

going to motor.

either by shutting off the engine on a

 

 

closed loop system or returning the

 

 

control valve spool to neutral on an

 

 

open center system, the motor will

 

 

free-wheel after it has leaked off. This

 

 

is inherent in the design. On a closed

 

 

loop or propulsion system, the motor

 

 

will not free-wheel as long as charge

 

 

pressure is maintained to and from

 

 

the motor.

Excessive Case Drain flow.

Excessive internal wear in motor.

Disassemble motor; inspect parts and

 

 

replace as necessary. Case Drain

 

 

flow should not exceed 1.5 GPM at full

 

 

pressure.

INTERSTATER 03/09

Maintenance Section 5-21

© 2009 Alamo Group Inc.

MAINTENANCE

Page 175
Image 175
Alamo 803213C, FC-FL-0001 manual Troubleshooting