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OPERATION
Problem | Possible Cause | Remedy |
Motor Runs Too Slow | Engine RPM too slow | Tractor must be operated at the 540PTO speed |
(or Slows Down Under |
| as indicated on the tachometer |
Load) |
|
|
Motor Stops (Stops |
|
|
under Load) | Pump Drive Damaged | Check drive shaft attachment to the tractor |
| ||
| Logic Valve | Remove logic valves and inspect seals. |
| (Gear Systems) | Replace as required |
| Damaged | Remove solenoid valve. Replace seals as |
| Solenoid Valve | required. |
| Pump Worn or Defective | Test to confirm, Repair or replace as required |
| Motor Damaged or | Confirm Pump is Working correctly, Check that |
| defective | spindle is not locking up, Replace or repair the |
|
| motor as required |
OPERATION
Pump Seizure (Pump
Locks Up)
Pump Wear (Rapid
Excessive Wear)
Incorrect Oil in System | Flush and fill with proper oil per the |
| specifications |
Air in the oil | Locate the source of the air intake and fix. |
| Flush and fill the oil as required |
Excessive Ground Speed | Operator Abuse |
for Mowing Conditions |
|
Excessive Internal | Confirm with pressure/flow test and replace or |
Leakage in pump/motor | repair as required |
Low Relief Valve Setting | Check the Setting using a pressure/flow meter |
| with a restrictor valve. Adjust or replace as |
| needed |
Restrictions in the system | Identified by a concentration of heat due to |
| crimped hydraulic line, relief valve failure or |
| contamination. |
Lack of Oil | Repair or replace the pump or motor. Fill the |
| oil to the correct level and check for leaks |
Inadequate or lack of pump | Pumps must be properly primed prior to initial |
Prime during initial start up. | startup. Consult the Technical Service manual |
| or contact Customer Service for proper |
| procedures |
Improper assembly | Pump may have been reassembled incorrectly |
| by the dealer following a prior failure. Rebuild |
| or replace |
Contamination | Contaminants in the system will damage the |
| components. Repair or replace the affected |
| components, then flush and refill with clean oil. |
| Inspect the tank for debris. |
Defective Pump | Confirm defect with customer service and |
| replace |
1900 07/11 | Operation Section |
© 2011 Alamo Group Inc.