Alamo none User Manual download pdf (Page 140)

MAINTENANCE

GRASS KING 03/09 Maintenance Section 5-12

MAINTENANCE

POSSIBLE TROUBLE

POSSIBLE TROUBLE CAUSES REMEDIES

1. Motor turns while unloaded

but slows down or stops when

load is applied.

A. Scored back plate.

B. Scored or worn piston shoes.

C. Low relief valve pressure.

A. Remove backplate and

examine surface condition of flat

area; if scored, replace

backplate. DO NOT LAP.

B. Disassemble motor, examine

condition of shoes on pistons;

replace pistons as a complete

set if necessary. DO NOT LAP.

C. Check relief valve for proper

pressure setting adjust or

replace relief valve.

2. Motor will not turn. A. Severely scored backplate. A. Disassemble motor

completely. Inspect all parts,

clean all parts, replace all worn

parts and flush hydraulic system.

3. Motor free wheels. A. Oil-flow and pressure shut off

going to motor.

A. 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.

4. Excessive case drain flow. A. Excessive internal wear in

motor.

A. Disassemble motor, inspect

parts and replace as necessary.

Case drain flow should not

exceed 1.5 GPM at full pressure.

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Alamo none User Manual Page 140

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