Changing The Plunger - ProMinent Makro TZ Operating Instructions Manual

Repairs
10.1

Changing the plunger

Removing the liquid end
48
WARNING!
Risk of injury from the fan impeller
The fan impeller beneath motor's fan cowling can cause
severe injuries while it is turning.
– The pump must only be connected to the mains
voltage with the fan cowling closed.
CAUTION!
Warning of feed chemical spraying around
Feed chemical can spray out of the hydraulic compo‐
nents if they are manipulated or opened due to pressure
in the liquid end and adjacent parts of the system.
– Disconnect the pump from the mains power supply
and ensure that it cannot be switched on again by
unauthorised persons.
– Depressurise the system before commencing any
work on hydraulic parts.
1. Flush the suction line, discharge lines and liquid end (activate
flushing assembly or immerse suction lance in a suitable medium
and pump for a while (consider the effect of the medium on your
system first!)) or proceed, as described below.
2. Set the stroke length to 0% stroke with the pump running.
3. Switch off the pump.
4. Secure the pump to prevent it being switched back on.
5. If the liquid end has not been flushed as per the above processes,
then protect yourself against the feed chemical - protective clothing,
safety glasses, ... .
After dismantling, immediately place parts that have been wetted
with the medium in a trough with a suitable medium for flushing –
rinse thoroughly with hazardous media.
6. Unscrew the hydraulic connectors on the discharge and suction
side.
7. Remove the protective cover (4) from the turret - see Fig. 18.
8. Remove a safety collar (2) from the bolt at the swivel head and pull
out the bolt (1)
9. Place a sling around the liquid end and suspend from a crane.
WARNING!
Heavy parts may fall
– A helper must steady the liquid end by hand.
– Secure the plunger to prevent it from dropping
out.
10. If this occurs: Remove the leakage or flushing tubes from the hose
nozzles (6).
11. If this occurs: Unscrew the support bracket (5) from the liquid end.
12. Remove the securing screws (3) from the turret flange
13. Remove the liquid end and place onto a solid, even surface.