Disassembly, Repair And Reassembly; Disassembly; Reassembly - Boulton Pumps ESK Series Instruction For Operation And Maintenance

2.6. DISASSEMBLY, REPAIR AND REASSEMBLY

Before starting work on the pumpset, make sure it is disconnected from the mains and can not be switched
on accidentally.
Follow the safety precaution measures outlined in "safety instructions".

2.6.1. Disassembly


Close all valves in the suctions and discharge lines, and drain the pump by opening the drain plug (230).

Drain oil from the bearing bracket (030) if the pump is oil lubricated.

Remove coupling guard and other safety guards.

Detach pump suction and discharge flanges and all auxiliary supply lines, disconnect the pump from the piping
system. No need for this operation for the pumps where SPACER TYPE COUPLING is being used (back pull out design).
For this application pump rotor assembly can be pulled out without dismantling the volute casing (001).

Disconnect pump from the driver and detach from the baseplate (no need to dismantle the motor for the pumps
which have spacer types of couplings).

Unscrew the bolts which mount casing cover (003) to the volute (001).

Take out spacer part of coupling (if used) from where is mounted. Use the space available to pull out bearing housing
and rotor assembly.

Pull off the pump end coupling half from the shaft (060) using a pull-off device and remove the coupling key (211).

Unscrew the end nuts (065) of the impeller and take out the impeller (050) and impeller key (210). Use rust remover
solvent if necessary during dismantling.

Dismantle bearing covers (034&035), casing cover (003), shaft (060) and bearings (202&203).

Clean all the parts, replace damaged or worn-out ones.

2.6.2. Reassembly


Reassembly proceeds in reverse sequence to disassembly as described in section 2.6.1. You may find the attached
drawings useful.

Coat the seats and screw connections with graphite, silicon or similar slippery substance before reassembly. If you
can not find any of the above you may use oil instead (except the pumps for drinking water)

Never use the old gaskets, make sure the new gaskets and o-rings are the same size as the old ones.

Start mounting from the bearings. Place ball bearings on their places on the shaft by slightly heating or by using
press. Put this part to the bearing housing from the coupling side put the bearing covers at both ends to their places.
Place stuffing box and impeller and tighten the impeller nut.

Mount rotor assembly to volute casing

Make sure the gaskets and o-rings are evenly placed without sliding and not damaged or not squezed at all.

Place the pump on the baseplate, couple the motor. Connect suction and discharge pipes as well as auxiliary pipes.
Take the unit into operation.
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