46
Magnum Valve Cartridge Removal Procedure
Removal of cartridges should be done only after
reviewing all other possible causes of the problem(s)
being addressed. There may be some difficulty
removing cartridges in valves that have been in service
for a period of time. Scale or iron build up around the O-
ring seals may cause breakage in the cage assembly of
the cartridge. If this occurs the cartridge must be
replaced.
To remove the number 1 or number 2 cartridges the
control must be removed first.
What follows is a step-by-step procedure for cartridge
removal:
1. Remove the four bolts securing the cartridge.
2. There are two parts or sections in the “cap” of the
cartridge assembly. The first part is the cover for the
diaphragm. The second part is attached to the main
cartridge assembly. This part is in contact with the
body of the Magnum valve. When referring to
inserting screwdrivers for cartridge removal it is the
area between the Magnum valve body and the
second part of the cartridge that is being referred to.
See Figure 35.
3. A small flat blade screwdriver should be inserted as
indicated in drawing. Pry a small opening between
the Magnum valve body and the second part of the
cartridge. This allows the insertion of two larger flat
blade screwdrivers that are used to remove the
cartridge.
4. Insert the two larger flat blade screwdrivers at the 10
o’clock and 2 o’clock positions on the cartridge. These
should be inserted approximately 1/2 inch into the
opening created by the small blade screwdriver. Use
the two screwdrivers to slowly move the cartridge out
of the valve body.
5. The cartridge should be removed for inspection. Look
for damaged O-ring or debris on sealing surface ring
of poppet.
There are two nipples, one on either side of the bottom
center on the inside of the cartridge cap. They transfer
water to and from the diaphragm. There are two O-rings
associated with the nipples. The O-rings must be in place
when the cartridge is re-installed into the valve body.
Figure 35
Correct Insertion Point
Incorrect Insertion Point
Remove bolts (4)
