Magnum Venus Plastech Megaject RTM Pro Revison 7_0 - Manual (Page 49)

Megaject RTM Pro Manual – Revision 7.00 – 13
th
APRIL 2006
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)
The piston is re assembled in reverse order to the above.
NOTE: If the shaft seal (0549) is to be replaced proceed further without re
assembling the Piston and seal as above
To replace the shaft seal (0549) it is necessary to remove the top block (0546) from
the machine. To do this first remove piston bolt (0342) and 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.
Reassemble in reverse order. Observe that medium strength thread lock should be
used on piston bolt (0342)
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)
6.6. Replacing Catalyst Pump Seals
Remove catalyst pump from ratio arms. Disconnect inlet and outlet hoses at swivel
fittings (0153 and 0388)
Unscrew bottom (0522) and top (0528) from outer tube (0526). .
Slide pump cylinder (0525) out of top block and remove from piston and shaft (0539)
Unscrew piston seat (0531) from shaft locking against turning seal body (0529).
Examine piston ball and spring. Replace if necessary.
Remove piston seal (1712) and piston bush (0530) from piston seat (0531).Replace
piston seal and bush (1712 and 0530)