Pentair AUTOTROL MAGNUM 742 - Cartridge Replacement

Installer Manual Magnum 742-762 - Maintenance
Ref. MKT-IM-012 / C - 25.10.2019 83 / 106
9.6.12. Cartridge replacement
No. Operation
Note
Removal of cartridges should be done only after reviewing all other possible causes of
problem (see 10.3. Magnum valve cartridge, page 88).
Note
There may be some difficulties to remove cartridges in valves that have been in service for a
long period of time. Scale or iron build up around the O-ring seals may cause breakage in
the cage assembly of the cartridge.
Note
The controller must be removed first before removing #1 drain cartridge or #2 rinse
cartridge.
A Using a combination wrench, remove the four bolts (1).
B
Using a flat screwdriver, pry a small opening between the valve body and the second part of
the cartridge.
Caution
There are two parts or sections in the cap of the cartridge assembly. The first part is a cover
for the diaphragm. The second part is attached to the main cartridge assembly. Insert the
screwdriver between the valve body and the second part of the cartridge assembly (2).
C
Insert two larger flat screwdrivers at the 10 o’clock and 2 o’clock positions of the cartridge.
These should be inserted approximatively 1 cm into the opening created by the small
screwdriver. Use then the two screwdrivers to slowly move the cartridge (4) out of the valve
body.
D Inspect, clean and/or replace the damaged part of the valve cartridge.
E Reverse above procedure steps to rebuild.
Note
Check that the nipples O-rings (3) are in place when the cartridge is rebuild into the valve
body.