Pump Overhaul; Maintenance - Craftsman 390.269151 Owner's Manual

PUMP OVERHAUL

Step 1 (Figure 2)
A. Remove 4 body screws (Key 1), front wearplate (Key 2),
O-Ring (Key 3), and Impeller (Key 4).
B. Clean out inside of pump body.
Step 2 (Figure 3)
A. Remove back wearplate (Key 6) and set aside .
B. If seal is leaking, remove 2 body bolts (Key 5) and pump
body (Key 7, Figure 4).
Step 3 (Figure 4)
A. Remove seal retainer (Key 9) with screwdriver and re-
move seal (Key 8). Install the new seal with lip facing to-
ward impeller side of pump body. Press seal retainer (Key
9) squarely and firmly into seal bore of body.
B. Check motor shaft for wear under seal area. If grooved or
worn, replace motor.
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Figure 2 – Disassembly
Remove
wear plate
if worn.
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Replace seal
if leaking.
Figure 3 – Remove wear plate and set aside.
Replace motor if
shaft is worn.
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Figure 4 – Replace motor if shaft is worn.

MAINTENANCE

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Step 4 (Figure 5)
A. Attach pump body (Key 7) to motor with 2 body bolts
(Key 5).
B. Install inner (back) wearplate (Key 6) in body bore with
unworn surface toward impeller.
Step 5 (Figure 6)
A. Lightly grease inside of pump housing with a lithium
based grease to ease installation of impeller (Key 4). Other
greases could damage impeller.
B. Line up flat on motor shaft with flat inside impeller insert.
C. Push impeller into pump body using clockwise twist to
bend impeller blades in direction of motor rotation.
Step 6 (Figure 7)
A. Install O-Ring (Key 3) and front wearplate (Key 2). If front
wearplate is worn, reverse plate so unworn side faces the
impeller.
B. Tighten the 4 body screws (Key 1), moderately and evenly
at first; when all screws are snug, retighten to fasten cover
firmly. Do not overtighten.
Install wear plate
with smooth
side out.
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Figure 5 – Install wear plate.
Lightly grease
housing bore with
lithium-based grease
and install impeller.
Figure 6 – Install impeller.
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2
Figure 7 – Reassemble pump.
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