Magnum Venus Plastech Pro Series VPRO-45220 22:1 & 7:1 - Manual (Page 29)

VPRO-45220 Series Resin Pump Manual
Rev. 11/2013 Page | 29
Remove Cylinder Head:
NOTE: Use the correct drawing for the Pump Assembly you are working with and VPRO-
2000.
1. Remove the air tube from the top of the pump air motor.
2. Use a wrench to unscrew the cylinder head.
3. Inspect the inside of the cylinder head for wear or damage.
4. Remove O-Ring from the air motor piston.
5. Remove O-Ring from the top of the center section casting (85723-3).
6. Remove hex nut from the top of the air motor piston.
7. Unscrew the air motor piston from the piston rod.
Remove Shift Block Assembly:
NOTE: The shift block assembly does not need to be completely disassembled for
routine inspection and maintenance. If troubleshooting indicates that you need to
disassemble the shift block, please see Section 7: Shift Block for complete instructions.
1. To remove the shift block assembly from the pump, remove the three hex screws (F-HB-
04C-20). As you remove hex screws, hold onto the shift valve assembly with one hand
to prevent it from falling.
2. Set aside for now.
NOTE: Do not remove machine screws (F-MS-832-24), which holds the valve (VPRO-
2003) in place.
NOTE: The O-Ring (O-S-012) at the top of the shift block assembly will need to be
replaced during reassembly.