Magnum Venus Plastech Powerhead MPH_UPPH_VPH–5000 Series - Manual (Page 16)

MPH / UPPH / VPH – 5000 Series Manual
Rev. 5/2012 Page | 16
Valve Block Disassembly:
1. Remove the two Hex Head screws (F-HB-04C-56-SS) from the front of the Muffler
(refer to drawing) and remove the Muffler.
2. Remove the four Socket Head Cap Screws (F-CS-04C-40-SS) from the Valve Block.
NOTE: While removing the Valve Block from the End Cap do not lose the O-rings.
3. Unscrew the Poly Fitting nut from the Male Elbow (MPH-2539) located on the side
of the Valve Block. Remove the two End Caps (MPH-2521) from the Valve Block.
4. Remove the Pipe Plug (PF-AP-04-SS) from the Lower Valve Block (MPH-5001).
Use a 7/16” Socket or Nut driver on either of the two Valve Pistons (MPH-2517)
and rotate until the hole in the Valve Poppet (MPH-5008) aligns with the pipe plug
port in the lower Valve Block.
5. Insert a 7/32” Hex wrench through the pipe plug port and into the hole in the Valve
Poppet (MPH-5008). (See Figure 1) Unscrew either of the two Valve Pistons (MPH-
2517) and remove. Repeat removal of the second Valve Piston.
Figure 1:
Use a 7/16” Socket or Nut driver on the top of the valve piston and
rotate to align the round hole in the poppet with the tapped hole in
the block. Insert hex wrench into the poppet and unscrew the valve
piston from the valve rod. Repeat process for second valve piston.
NOTE: The hole diameter in the Valve Poppet is .2685 (6.81mm) if a 7/32” hex
wrench is not available.
6. Remove the Button Head Cap Screw (F-BHCS-04C-16-SS) from the front of the
Lower Valve Block (MPH-5001). Twist and pull the Upper Valve Block (refer to
drawing) from the Lower Valve Block (MPH-5001). Remove the Valve Rod
assembly from the Valve Block.