Magnum Venus Plastech Megaject MKIV Revision 1_2 - Manual (Page 22)

Megaject MK IV Issue 1_2 25/11/2003 Page 22 of 31
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 recirculating 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)