Repair manual

Repair PS2 3703, PS3 3703, PS4 3703, PS3 5503, PS4 5503

Repair.fm 172

6.7.4.1 Impeller Disassembly

Note: Draining oil is not required to disassemble, inspect or replace

the impeller. However, if further disassembly and testing is

required, drain oil.

1. Prior to working on pump, all electrical power supply circuits must

be disconnected.

2. With pump on its side, remove three nuts (au), three washers (at)

and suction strainer (as).

3. Remove three stud bolts (ar) and three washers (aq) from volute

(av).

Note: Remove any gaskets (ao) between suction cover and volute.

These gaskets are used as shims to adjust impeller

clearance.

4. Using a pneumatic wrench, remove acorn nut (an). Remove

lockwasher (am) and thread cover (al).

Note: Impeller vanes may be very sharp due to excessive wear.

Handle with care.

5. Remove impeller (az).

Note: A puller tool, part number 0151080, may be required.

6. Remove the key (bb) from the rotor shaft for inspection.

6.7.4.2 Impeller Inspection

1. Visually inspect impeller (az) for corrosion, wear or damage. Worn

impellers compromise peak performance.

2. Visually inspect impeller key (bb) and rotor shaft keyway for signs

of uneven wear.

3. Visually inspect volute (av) for wear and damage. Look for signs of

wear on volute cutwaters and surfaces facing impeller.

6.7.4.3 Impeller Clearance

1. Measure the distance between impeller and volute after assembly.

Keep a recommended clearance of 0.3–0.5mm (0.118–0.196in).

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