Specifications Information and Repair Parts Manual
489 & 490 Series
4890-251-00
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
for 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.
High Head Centrifugal Pumps
Cast Iron, Bronze, and Stainless Steel Models
Refer to pump manual 1808-634-00 for General Operating and Safety Instructions.
CAST IRON UNITS
Pump construction is cast iron casing and adapter with a stainless steel
impeller. Buna N type 21 mechanical shaft seal with carbon and ceramic wear
faces. O-ring casing seal. Handles liquids from 40º to 180º F (4º to 82º C).
BRONZE UNITS
Pump construction is cast bronze casing and adapter with a stainless steel
impeller. Viton type 21 mechanical shaft seal with carbon and ceramic wear
faces. O-ring casing seal. Handles liquids from 40º to 200º F (4º to 93º C).
STAINLESS STEEL UNITS
Pump construction is cast 300 series stainless steel casing, adapter and
impeller. Viton type 21 mechanical shaft seal with carbon and ceramic wear
faces. O-ring casing seal. Handles liquids from 40º to 200º F (4º to 93º C).
MAINTENANCE
Make certain that the unit is disconnected from the power source before
attempting to service or remove any components!
SHAFT SEAL REPLACEMENT
Refer to Figures 1 and 2.
REMOVAL OF OLD SEAL
IMPORTANT:
Always replace both seal seat (Ref. No. 5) and seal head (Ref.
No. 6) to ensure proper mating of components! Also, impeller seal (Ref. No. 9)
should be replaced anytime impeller fastener (Ref. No. 10) has been removed.
1. Remove fasteners (Ref. No. 3) connecting casing (Ref. No. 12) to adapter
(Ref. No. 4).
2. Remove casing.
Care should be taken not to pinch or “shave” casing seal (Ref. No. 11)
between adapter and casing.
3. Use a box and/or socket wrench to remove impeller fastener. Remove
impeller seal and impeller (Ref. No. 8).
NOTE:
Motor shaft must be held in place to remove impeller. Back of the
motor either has slot in shaft (use large screwdriver to hold) or has 2 flats on
motor shaft (use 7/16 open end wrench to hold). Impeller and impeller fastener
unscrew CCW (Counter Clockwise) when looking at the front of pump.
IMPORTANT:
Care should be taken to be sure that the same number of
thickness of shim washers (Ref. No. 7) are replaced behind the impeller as was
removed. Shim washers are located directly behind impeller and become loose
as impeller is removed.
4. The seal head can now be pulled from shaft.
5. Pry seal seat from adapter.
INSTALLATION OF NEW SEAL
The precision lapped faces on mechanical seal are easily damaged.
Handle your repair seal carefully. Do not touch polished seal faces.
IMPORTANT:
Be sure that shaft shoulder does not damage polished face (see
figure 1).
DESCRIPTION
These pumps are non-self-priming units designed for use where higher heads are needed to handle liquid transfer, heating and cooling application, where no
suction lift is required. All models feature high efficiency closed impellers and continuous duty, 3450 RPM, 56J frame motors. The discharge port on all models
can be rotated in 90º increments to accommodate specific applications. Casing working pressure to 150 psi (1034 kPa). These are manual units, no controls
are supplied. Single phase units are capacitor start and have automatic thermal protection. Check motor wiring before putting unit into operation (see motor
nameplate for specific wiring diagrams). All units are for use with nonflammable, non-abrasive liquids compatible with pump component materials.
Figure 1 - Mechanical Seal Replacement
