AMT 315C, Specifications Information And Repair Parts Manual, Page: 1 / 8

Specifications Information and Repair Parts Manual
315, 424, 425, 426 Series
3150-257-00 1 9/2016
Please read and save this Repair Parts Manual. Read this manual and the General Operating Instructions carefully before attempting to assemble, install, operate
or maintain the product described. Protect yourself and others by observing all safety information. The Safety Instructions are contained in the General Operating
Instructions. Failure to comply with the safety instructions accompanying this product could result in personal injury and/or property damage! Retain instructions
f or future reference. AMT reserves the right to discontinue any model or change specifications at any time without incurring any obligation.
©2016 AMT Pump Company, A Subsidiary of The Gorman-Rupp Company, All Rights Reserved.
Periodic maintenance and inspection is required on all pumps to ensure proper operation. Unit must be clear of debris and sediment. Inspect for leaks and loose bolts. Failure to do so
voids warranty.
CENTRIFUGAL PUMPS
Refer to pump manual 1808-634-00 for General Operating and Safety Instructions.
INSTALLATION
Flooded Suction: Net Positive Suction Head Required
(NPSHR). Curve with NPSHR available at www.amtpump.com.
1. Problems will arise in operation of this pump unless the
recommended NPSHR is supplied to the pump (See
“Troubleshooting”chart in 1808-634- 00 manual).
2. Salt Water Usage: Because of crystallization and erosive
material on the shaft seal (Ref. Nos. 9, 10), we recommend
installation of seal-wash hose (Ref. No. 21). Using a
wrench, remove the pipe plug (Ref. No. 20) from adapter
(Ref. No. 18) and pipe plug (Ref. No. 15) from casing (Ref.
No. 14) (remove pipe plug on the 3 o’clock position). Install
optional seal wash hose.
NOTE: Applicable only with pumps having (A220-90) seal
wash and hose installed or by ordering casing (Ref. #18) with
optional seal wash and hose installation (A220-90).
MAINTENANCE
Make certain that unit is disconnected from power source
before attempting to service or remove any component.
REMOVAL OF OLD SEAL
Refer to Figure 1 for seal location.
IMPORTANT: Always replace both seal seat (Ref. No. 9) and
seal head (Ref. No. 10) to ensure proper mating of components!
Also, impeller seal (Ref. No. 16) (where applicable) should be
replaced any time impeller fastener (Ref. No. 13) has been
removed.
1. Remove fasteners (Ref. No. 6) that connect adapter (Ref.
No. 3) to casing (Ref. No. 14).
2. Remove casing and 0-ring (Ref. No. 8).
Care should be taken not to pinch or “shave” o-ring
between adapter and casing.
3. Using a wrench, remove impeller fastener, impeller seal
(where applicable) and impeller (Ref. No. 12).
IMPORTANT:
Care should be taken to ensure that the same
number of shim washers (Ref. No. 11) are replaced behind
impeller as were removed. These shim washers are located
directly behind impeller. These washers as well as impeller key
(Ref. No. 19) (where applicable) become loose as impeller is
removed.
4. Seal head and shaft sleeve (Ref. No. 17) (where applicable)
can now be pulled from shaft.
5. Pry seal seat from adapter.
6. Push seal head from shaft sleeve (where applicable).
INSTALLATION OF NEW SEAL
The precision lapped faces on shaft seal are easily
damaged. Handle your replacement seal carefully.
1. Thoroughly clean all surfaces of seal seat cavity.
2. Using a clean cloth, wipe shaft and shaft sleeve (where
applicable) and make certain that they are perfectly clean.
3. Wet rubber portion of new seal seat with a light coating of
soapy water. While wearing clean gloves or using a clean
light rag, press seal seat squarely into adapter recess.
Avoid scratching white ceramic surface. If seat will not
position properly, place a cardboard washer over polished
surface and use a piece of pipe to press in firmly, but gently
4. Dispose of cardboard washer. Check again to see that
polished surface is free of dirt and all other foreign particles
and that it has not been scratched or damaged.
5. Wet inside rubber portion of new seal head with a light
coating of soapy water. Slide head onto shaft/shaft sleeve.
DESCRIPTION
These non self-priming centrifugal pumps are intended for liquid transfer, heating and cooling circulation, booster service and
other industrial applications where no suction lift is required.
All models feature a semi-open clog resistant impeller and a pull-from-the-rear design for easy servicing. A dual volute casing
is used on all models except 4240. A mechanical seal (comprised of carbon, ceramic and stainless steel components) isolates
motor shaft from liquid being pumped. Discharge port on pump casing can be rotated in 90° increments with vent and drain plugs
for all positions. Buna seals handle liquids from 40° to 180° F (4° to 82° C).Viton
®
seals handle liquids from 40º to 200º F(4º to
90º C) Maximum ambient temperature 104° F (40° C). Casing working pressure to 100 psi (689 kPa). These are manual units, no
controls are supplied. For use with nonflammable, non-abrasive liquids compatible with pump component materials.