Multiquip ST61230, ST61460, ST41460, ST41230 manual Impeller Removal, Mechanival Seal Replacement

maintenance

Impeller Removal

Refer to the the following procedure and Figure 18 for the removal of the impeller.

1.	Remove oil screw and gasket from the oil fill chamber
	port. Drain oil from oil chamber as referenced
	in Figure 18.
2.	Remove the four hex nuts and lock washers that secure
	the base plate to the inlet plate.
3.	Remove base plate, inlet plate, o-ring and strainer.
4.	Next, remove the four bolts and lock washers that
	secure pump casing to the seal bracket.
5.	Remove pump casing and seal bracket.
6.	Remove impeller cap nut and washer from motor shaft.
7.	Using a rubber mallot, tap impeller off motor shaft

ST61230/ST61460

ST41230/ST41460

remove impeller and associated hardware from motor

shaft. If necessary use a puller to remove impeller.

8. Reassemble in reverse order.

Mechanival Seal Replacement

1.Clean entire area surrounding mechanical seal.

2.Lubricate mechanical seal with 30 wt. motor oil before installing back on motor shaft.This lubrication will help ease the seal back onto the motor shaft.

3.In addition replace o-rings, gaskets and any associated rubber components that show signs of wear.

4.Inspect and replace if necessary the pump casing (volute) and seal bracket.

NOTICE

Clearance between impeller and wear plate (pump casing) should be between .011~.019 in.(0.3~0.5 mm).If impeller is defective or badly worn, replace immediately.

KEY

SEAL

BRACKET

PUMP

CASING

LOCK

WASHER (4)

STANDOFF

SCREW

MOTOR

SHAFT

GASKET

OIL DRAIN

SCREW

IMPELLER

CAP NUT

LOCK

WASHER (4)

SCREW (4)

INLET PLATE

STRAINER

HEX NUT (4)

LOCK WASHER (4)

Figure 18. Impeller Removal

page 22 — st4/ST6 series submersible pumps • operation AND PARTS manual — rev. #1 (11/12/13)