Section 7
Hydraulic System
20412971
8-2012/Rev 08
7-6
Proportional Pressure Valve Maintenance
The screen in the optional proportional valve can become blocked with debris resulting in erratic
pressure fluctuations or the inability to reach or maintain the operating pressure.
Figure 7-5: Proportional Valve
1. Unscrew and remove the retaining nut on the proportional pressure valve.
2. Remove the coil and electronics from the valve.
3. Unscrew and remove the valve from the hydraulic manifold.
4. Use air or alcohol to clean the screen inside the valve.
NOTE
A blocked screen will appear black. Clean the screen until it is clear.
5. Screw the cleaned valve into the hydraulic manifold.
6. Replace the coil and electronics.
7. Replace the retaining nut.
Motor Maintenance
The motor should be inspected at regular intervals, approximately every 500 hours of operation or
every three months, whichever occurs first. Keep the motor clean and the ventilation openings
clear.
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