Magnum Venus Plastech PATRIOT 5 PAT-PH-5000 Series User Manual
Page 17
PAT-PH-5000 Series Powerhead Manual
Rev. 05/2012
Page | 17
7.
Unscrew either of the two valve pistons (MPH-2517) and remove. Repeat
removal of the second valve piston.
Figure 2
8.
Using a 7/16 open end wrench remove the two hex cap screws (F-HB-04C-08)
from the front of the lower valve block (PAT-PH-5002). Twist and pull the upper
valve block (PAT-PH-5001) from the lower valve block (PAT-PH-5002). Remove
the valve rod assembly from the valve block. (See fig. 2)
9.
Remove the two cap screws (F-CS-04C-08-SS) from each of the two valve
exhausts (MPH-5009). Pull both of the valve exhausts from the valve blocks.
Remove the diaphragm (MPH-5010) from both valve blocks.
10. Remove each O-ring and replace with new. Coat every new O-ring with brown
grease (08465). Coat the diaphragm bore and both valve piston bores with
brown grease (08465) before assembling. Use a wire brush to clean the valve
rod threads of any dry thread locking compound.
NOTE: Avoid putting any scratches in the valve blocks. To remove the
diaphragm use a screwdriver and push the center riser on the diaphragm to one
side and slide out.