Magnum Venus Plastech PATRIOT 4-1_4 PAT-PH-4250 - Manual (Page 16)

PAT-PH-4250 Series Powerhead Manual
Rev. 05/2012 Page | 16
Valve Block Disassembly:
1. Remove the two hex head screws (F-HB-04C-52) from the front of the muffler
(PAT-PH-3210-01) and remove the muffler.
2. Remove the air line from the poly tee (MPH-2538) on the side of the valve block
3. Remove the valve block from the side of the power head by removing the four
socket head cap screws (F-CS-04C-32) from the valve block.
4. Remove the two end caps (MPH-2521) from the valve block.
5. Remove the fitting (PF-HN-06-08S) from the side of the lower valve block (PAT-
PH-3202). Rotate either of the two valve pistons (MPH-2517) until the hole in the
valve poppet (PAT-PH-3205) aligns with the port in the lower valve block.
6. Insert a 7/32” hex wrench through the pipe plug port and into the hole in the valve
poppet (PAT-PH-3205).
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-3202). Pull the upper valve
block (PAT-PH-3201) from the lower valve block (PAT-PH-3202). Remove the
valve rod assembly from the valve block. (See fig. 2)
NOTE: The hole diameter in the valve poppet is .2685 (6.81mm) if a 7/32”
hex wrench is not available