Pump Disassembly - Stoelting CW5-37A Technical Handbook

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Yearly overhaul

The main operations for the yearly overhaul are:

—

Check-up and cleaning of the internal parts, and of the air condensator in particular;

—

Disassembly of the pump and replacing of the parts subject to wearing: mechanical seals, sealing ring (V-Ring),

paddles;

—

Checking of the general operating conditions of the device.

The following procedures describe the correct way of effecting the maintenance operations requested by the device.

Pump disassembly

DISMANTLING

Remove the supply faucet, the labyrinth-tube and the labyrinth, and pull out the suction tube and the complete

air-inlet valve. Unscrew the nuts [27] by using an 8mm TUBE spanner, then remove the relevant washers and

the pump lid [28]. Remove the pump body [3].

Carefully extract the paddles [29] by using tapered-nose pliers, making sure not to lose the springs [30] that

tend to push the paddles outside;

Replace the paddles [29] at least once every year. After having extracted them, check that they are not

damaged or excessively worn. Parts generally subject to wearing are marked with [U].

Rotate the joint [44] by hand, checking that there are no pressure point, and that there is no clearance between

the rotor and the pump body.

ASSEMBLING

Find the rounded side of the paddles. Insert the paddles [29] together with the springs [30] in the pump body [3]

with the groove looking downwards;

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