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OPERATION
DB150 07/11 Operation Section 4-44
© 2011 Alamo Group Inc.
OPERATION
Problem Possible Cause Remedy
Motor Runs Too Slow
(or Slows Down Under
Load)
Engine RPM too slow Tractor must be operated at the 540PTO speed
as indicated on the tachometer
Motor Stops (Stops
under Load)
Pump Drive Damaged Check drive shaft attachment to the tr actor
Logic Valve O-ring Failure
(Gear Systems)
Remove logic valves and inspect seals.
Replace as required
Damaged O-ring on
Solenoid Valve
Remove solenoid valve. Replace seals as
required.
Pump Worn or Defective Test to confirm, Repair or replace as required
Motor Damaged or
defective
Confirm Pump is Working correctly, Check that
spindle is not locking up, Replace or repair the
motor as required
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
for Mowing Conditions
Operator Abuse
Excessive Internal
Leakage in pump/motor
Confirm with pressure/flow test and replace or
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.
Pump Seizure (Pump
Locks Up)
Lack of Oil Repair or replace the pump or motor. Fill the
oil to the correct level and check for leaks
Pump Wear (Rapid
Excessive Wear
)
Inadequate or lack of pump
Prime during initial start up.
Pumps must be properly primed prior to initial
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