Magnum Venus Plastech Megaject MKIV Revision 1_6 - Manual (Page 24)

Megaject MK V Issue 1_6 Page 24 of 41
Resin pump service.
In order to service internal resin pump seals first pump out any resin from internals by placing
system on recirculation. It is also advisable to clean internals with solvent after resin removal
before service. Do this by re-circulating 5 litres solvent through resin pump and finally pumping
the solvent out of system.
Isolate machine from air supply
4.3.2 Piston Seal (0555) and Shaft seal (0549)
To access Piston seal (part 0555) remove 4 x M8 securing bolts (Part 0559). Slide Pump cylinder
(0548) and lower gold block assembly (0558) from piston.
The piston seal may now be removed by unscrewing seal retainer nut (0556). Replace seal
observing that the seal lip must face UP and valve ball (0554) is placed back into cage (0551)
NOTE If the shaft seal (0549) is to be replaced proceed further without re-assembling the Piston and
seal
The piston is re assembled in reverse order to the above. Observe that medium strength
thread lock should be used on piston bolt (0342)
To replace the shaft seal (0549) it is necessary to remove the top block (0546) from the machine.
To do this first remove the four M8 retaining bolts accessed from the underside of top block.. This
will allow the top block to be drawn down shaft away from the four square air motor pillars.
Using circlip pliers remove large circlip (0544). Remove washer (0545). Remove old seal (0549)
and discard. Install new seal and re assemble pump in reverse order. Note- O ring top and
bottom seals (0547) may be replaced during these service operations if found to be damaged.
Ensure pump assembly is evenly retightened with M8 tie bolts (0559)
When Pump is reinstalled in machine, renew pump seal lubricant in top seal block (0546)