12 • SCREENGUARD AUTOMATIC SCREEN FILTERS OPERATION INSTALLATION AND MAINTENANCE GUIDE
HYDRAULIC PISTON ASSEMBLY REMOVAL & REPLACEMENT (FIGURE 7)
1. The hydraulic piston enables the linear movement of the dirt collector.
2. Close the inlet and the outlet line valves.
3. Verify that the filter is drained prior to service.
4. Disconnect the control tube from the piston assembly’s upper section.
5. Screw the brass base out (clockwise) of the filter body and carefully remove the piston assembly.
6. Remove the O-ring from the current piston assembly.
7. Position the O-ring in the new piston assembly.
8. Lubricate the O-ring with silicon grease.
9. Carefully slide the new piston assembly into the filter housing.
10. Screw (counterclockwise) the brass base into the filter body and tighten it gently.
11. Connect the control tube to the piston assembly’s upper section.
12. Open the inlet and the outlet line valves.
13. Check for leaks.
14. Push the piston indicator (on the rear side of the piston) inside.
15. Perform a flushing cycle manually by pushing the manual button (M on the screen display). (See Figure 4).
16. Verify that the piston travels its complete path and that the indicator pops up.
17. Verify that the hydraulic flushing valve closes after 10 seconds.
FIGURE 7
WARNING
Take precautions while
operating the filter as the
filter may enter a flushing
mode automatically,
without prior warning.
MAINTENANCE
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