Magnum-venus-plastech Megaject MKIV Revision 1_6 User Manual download pdf (Page 30)

Megaject MK V Issue 1_6 Page 30 of 41

Servicing Injection Head (Polyester)

See drawing 22015

Note: During maintenance ensure resin and catalyst recirculation valves are in the

recirculate position. Avoid any cross contact of resin and catalyst.

Procedure

9. Remove air signal and solvent lines from the head. Using a 5mm allen key,

remove head block bolts. Split head into two sections. Remove head block O ring.

To remove NRV 3, first remove spring retaining pin at top of valve. Screw M8 bolt

partially into the valve and pull to remove from head.

10. NRV 2 may be unscrewed from the side port.

11. To remove NRV 1 unscrew from resin recirculation valve swivel fitting and then

remove from top head block.

12. To remove NRV 4, undo catalyst pipe swage fittings. Unscrew 3 way ball valve

from NRV 4. Unscrew NRV 4 from bottom head block.

13. Inspect all head block and NRV galleries. If hardened resin is evident, remove or

replace parts as necessary.

14. To disassemble all NRV’s, remove spring retaining pin. PTFE cone can be

replaced by removing spring from seat retainer.

15. When using a new PTFE cone, grind into NRV seat using thumb pressure only to

ensure a good seal. On reassembly a suitable hook must be used to stretch the

spring sufficiently to enable the retaining pin to be replaced.

16. Reassembly is a reversal of above procedures. Inspect head block O ring and

replace if necessary using a small amount of silicon grease to lubricate.

17. After reconnection of hoses and pipes, machine must be recirculated to expel air.

Note: We highly recommend catalyst and resin pipes are not removed from the recirculation

valves as leakage is inevitable.

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Magnum-venus-plastech Megaject MKIV Revision 1_6 User Manual Page 30