Alamo Interstater 803213C Operator's Manual page 175

Troubleshooting
POSSIBLE TROUBLE
Motor turns while unloaded
but slows down or stops when
load is applied
Motor will not turn.
Motor free wheels.
Excessive Case Drain flow.
INTERSTATER 03/09
© 2009 Alamo Group Inc.
MAINTENANCE
CAUSES
Scored backplate.
Scored or worn piston shoes.
Low Relief Valve pressure.
Severely scored backplate.
Oil-flow and pressure shut off
going to motor.
Excessive internal wear in motor.
Maintenance Section 5-21
REMEDIES
Remove backplate and examine
surface condition of flat area; if scored,
replace backplate. DO NOT LAP.
Disassemble motor, examine condition
of shoes on pistons; replace pistons as
a complete set if necessary. DO NOT
LAP
Check Relief Valve for proper pressure
setting; adjust pr replace Relief Valve.
Disassemble motor completely.
Inspect all parts, clean all parts,
replace all worn parts and flush
hydraulic system.
When the hydraulic system is shut off,
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.
Disassemble motor; inspect parts and
replace as necessary. Case Drain
flow should not exceed 1.5 GPM at full
pressure.