Alamo 1900 manual Identify the source of the Air. Replace Oil if

OPERATION

Problem	Possible Cause	Remedy
Cylinder Moves	Air in oil	Identify the source of the Air. Replace Oil if
Spongy or Jerky		Required, or cycle the mower several times to
		purge the oil

OPERATION

Cylinder Moves Some Functions (But Not All)

Wrong Oil Used	Check Specifications for proper oil, and replace
Oil is cold	System must be warmed to at least 40degrees
	F for proper operation.
Faulty Pump or Pump drive	Check or test then replace or repair as
	required.
Workport reliefs set too low	Test relief pressure and replace with proper
	Work port relief valve.
Faulty Joystick Controller	Test the joystick and repair or replace as
	required
Oil Level too low	Fill the hydraulic tank as required
Faulty Solenoid valve	Test and repair or replace as required
Contamination in valve	Flush system and clean the valve as required
Faulty main spool or valve	Replace the valve section
section
Bad Control Module	Replace the module
Incorrect Hose Routing	Check for proper hose routing in the Service
	manual and correctly install
Incorrect Work port Relief	Check work port relief pressure and replace as
installed	needed
Work Port relief failure	Test work port relief pressure and replace if
	required
Cylinder Failure	test cylinder, repair or replace as needed
One way Flow restrictor	Check proper installation in Service Manual.
installed in wrong port, or	One way flow restrictors are required on most
backwards	Gravity aided functions and both directions of
	the swing functions

	Pump Worn out	test to confirm, repair or replace as required
	Air in oil	Locate the source of the air and repair. Flush
		and fill oil as required
	Engine RPM too slow	rated rpm is 540 PTO speed as indicated on
		the tachometer
Cylinder Rod Bent	Operator Abuse	Operator training, Travel speed too fast, or
		impact with solid objects while mowing
	Misalignment of Cylinder	Operator abuse, Excessive loading of boom
	Lugs (bent boom)	components
	Work Port Relief improper	Check for proper setting. Replace as needed
	setting or failure
	Interference with another	Operator abuse or components interfering with
	component	boom movement
1900 07/11	Operation Section 4-46
© 2011 Alamo Group Inc.