AMT 315C, Specifications Information And Repair Parts Manual, Page: 2 / 8

Specifications Information and Repair Parts Manual
315, 424, 425, 426 Series
3150-257-00 2 9/2016
Slide shaft sleeve with seal head onto motor shaft (where
applicable). Seal head and seal seat will meet. Reinstall
any shims that have been removed (See “Shim Adjustment”
section).
IMPORTANT: Before installing new shaft sleeve, apply a bead
of non-hardening, pliable sealant (such as Permatex
®
Form-A-
Gasket ® No. 2) to motor shaft shoulder.
6. Replace impeller key (where applicable) and impeller.
Replace impeller seal (where applicable) before screwing
impeller fastener in place.
7. Reassemble pump.
8. A short “run-in” period may be necessary to provide
completely leak free seal operation.
SHIM ADJUSTMENT
When installing a replacement impeller (Ref. No. 12) or motor
(Ref. No. 1), it may be necessary to adjust the number of shims
(Ref. No. 11) to ensure proper running clearance between
impeller and casing (Ref. No. 14).
Proceed as follows:
NOTE: A proper running clearance is less than 0.010”.
1. For impeller replacement, add one 0.010” shim in addition
to those removed originally.
2. For motor replacement, add two 0.010” shims in addition to
shims removed during disassembly.
3. Reassemble pump as described in steps 6 and 7. (See
“Installation of New Seal” section).
IMPORTANT: Ensure that casing is snugly in place and check
shaft to make sure it is turning freely (rotate impeller by impeller
fastener, Ref. No. 13 with a wrench). If it turns freely, check to
ensure that adapter (Ref. No. 3) and casing are fitted metal-
to-metal where they meet on outside. If they are not metal-
to-metal, tighten fasteners (Ref. No. 6) and recheck shaft for
free turning. Tighten carefully, turning shaft while tightening
so that motor bearings are not damaged in the event that too
many shims were installed. If shaft seizes before fasteners are
completely tight, disassemble pump and remove one shim and
repeat reassembly.
Centrifugal Pumps