
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. | 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 |
|
| |
|
| is inherent in the design. On a closed |
|
| loop or propulsion system, the motor |
|
| will not |
|
| 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 |
© 2009 Alamo Group Inc.