AMT 315C Specifications Information And Repair Parts Manual Download Page 2

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

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