Magnum Venus Plastech Powerhead MPH_VPH–4250 Series - Manual (Page 17)

MPH / VPH – 4250 Series Manual
Rev. 05/2012 Page | 17
7. Remove the two Cap Screws (F-CS-1024-06-SS) from each of the two Valve
Exhausts (MPH-2522). Pull both of the Valve Exhausts from the Valve Blocks.
Remove the Diaphragm (MPH-2529) from the Lower Valve Block (MPH-2516).
(See Figure 2)
Figure 2
Lift the inner edge of the
diaphragm up and remove from
block. Coat the diaphragm bore
with lithium grease.
NOTE: Avoid putting any scratches in the Valve Blocks. To remove the
Diaphragm use a small screwdriver and push the center riser on the Diaphragm
to one side and slide out.
Repeat the removal of the Diaphragm from the Upper Valve Block (VPH-4257 or
MPH-2515).
8. Remove each O-ring and replace with new. Coat every new O-ring with lithium
grease (08465). Coat the diaphragm bore and both valve piston bores with lithium
grease (08465) before assembling. Use a wire brush to clean the valve rod threads
of any dry thread lock compound.