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MAINTENANCE
PA91 03/09 Maintenance Section 5-8
© 2009 Alamo Group Inc.
MAINTENANCE
ROTOR CONTROL VALVE/RELIEF VALVE
Relief Valve
The relief valve within the block is pre-calibrated to give setting of 3000 PSI (210 Bar). No servicing should be
required other than cleaning and examining for damage should a malfunction occur. Evidence or damage will
require a new component.
Replacing Worn or Damaged “O” Rings
1. The cable and spring centering mechanism must be removed. The brass bobbin at either end can be
extracted and the “O” rings can be removed from their locations using a soft hooked implement.
2. Replace the “O” rings carefully feeding them over the spool ends.
3. Replace the brass bobbins and reassemble the spring centering mechanism and cable to the valve.
P.T.O. GEARBOX
The gearbox is rigidly bolted on to the main frame and has a filler plug. Oil level is correct when level with the
lip of the filler plug aperture. The gearbox oil should be changed every two years or a 1000 hour intervals;
whichever occurs first. The capacity of the gearbox is 700 milliliters (1-1/4 pints) of EP 90 gear oil.
HYDRAULIC MOTOR
Servicing of the hydraulic motor should be limited to replacing seals, gaskets and O rings. Components of the
motor are matched to close tolerances and are therefore not replaceable as individual parts.
The torque setting of the cap screws is 6-7 KGM (40-47 lbs/ft.).
To remove the drive coupling from the shaft, use a tool of the sprocket type to remove it. Do not attempt to
remove the coupling by hammering or leverage as this will damage the motor internally.