Motor Runs Too Slow, Or Slows Down Under

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
	Pump Drive Damaged	Check drive shaft attachment to the tractor
	Logic Valve O-ring Failure	Remove logic valves and inspect seals.
	(Gear Systems)	Replace as required
	Damaged O-ring on	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

Pump Seizure (Pump

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 4-49