Top Plate - Autotrol Logix 740 Operation Manual

Top Plate

Remove screws
56
Rev A
The top plate holds the valve discs in place during operation. This plate is
removed to allow cleaning and replacing the valve discs.
NOTE:
The Autotrol valve discs are made from a chloramine resistant severe
service rubber. The valve discs will usually not need to be changed. Before
removing the top plate for valve disc service be certain that one of the discs is
not operating correctly.
To remove top plate:
1. Disconnect power to unit.
2. Remove cover.
3. Remove motor.
4. Remove camshaft.
5. Place unit in bypass.
6. Release water pressure by pushing the last valve disc open with a
screwdriver.
7. Any optional items may be removed.
8. Wiring harnesses should be removed.
9. Remove valve disc and spring.
10. Use a phillips screwdriver to remove the screws from the top plate.
11. Lift the top plate off. All the valve discs can be pulled straight out.
Inspect valve discs for wear. The sealing surface is the raised ridge on the
underside of the top shoulder.
Check each valve disc cavity in the valve for debris. Remove any foreign
objects before replacing the valve disc.
To install valve discs:
NOTE:
If the valve disc fits properly in the cavity, it will work correctly.
1. Put the valve disc into the correct (based on shoulder size) valve port
cavity. The metal end without rubber coating should be visible.
2. Push down on the shoulder to position the valve disc completely into
the port cavity.
3. The metal portion will be positioned straight up and the top of the
shoulder will be level with the valve.
VALVE SERVICE