Alamo BUSH HOG RMB 1660 Operator's Manual page 169

Problem
Cylinder Movement
Spongy or Jerky
Cylinder Moves Some
Functions (But Not All)
Cylinder Rod Bent
RMB 1660 01/22
© 2022 Alamo Group Inc.
OPERATION
Possible Cause
Air in oil
Wrong Oil Used
Oil is cold
Faulty Pump or Pump drive
Workport reliefs set too low
Faulty Joystick Controller
Oil Level too low
Faulty Solenoid Valve
Contamination in valve
Bad Control Module
Incorrect Work Port Relief
installed
Work Port relief failure
Cylinder Failure
One way Flow restrictor
Installed in wrong port, or
backwards
Pump worn out
Air in oil
Engine RPM too slow
Operator Abuse
Misalignment of Cylinder
Lugs (bent boom)
Work Port Relief improper
Interference with another
component
Operation Section 4-47
Remedy
Identify the source of the Air. Replace Oil if
Required, or cycle the cylinder several times to
purge the oil.
Check Specifications for proper oil, and replace
System must be warmed to at least 40degrees
F for proper operation
Check or test then replace or repair as
required.
Test relief pressure and replace with proper
Work Port relief valve
Test the joystick and repair or replace as
required
Fill the hydraulic tank as required.
Test and repair or replace as required
Flush system and clean the valve as required.
Replace the module
Check for proper hose routing in the Service
manual and correctly install
Test work port relief pressure and replace if
required
Test Cylinder, repair or replace as needed
Check proper installation in Service Manual
One way flow restrictors are required on most
gravity aided functions and both directions of
the swing functions
Test to confirm, repair or replace as required
Locate the source of the air and repair. Flush
and fill oil as required
2000 RPM is the rated speed as indicated on
the tachometer
Operator training, Travel speed too fast, or
impact with solid objects while mowing
Operator training, Excessive loading of boom
components
Check for proper setting. Replace as needed
Operator training or components interfering
with boom movement