AMT 489B-98 Assembly instructions

Specications 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 specications 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 ats 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
gure 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 e󰀩ciency closed impellers and continuous duty, 3450 RPM, 56J frame motors. The discharge port on all models
can be rotated in 90º increments to accommodate specic 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 specic wiring diagrams). All units are for use with nonammable, non-abrasive liquids compatible with pump component materials.
Figure 1 - Mechanical Seal Replacement
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AMT Pumps 489B-98

Specications Information and Repair Parts Manual 489 & 490 Series
4890-251-00 2 9/2016
1. Thoroughly clean all surfaces of seal seat cavity in adapter.
2. Using a clean cloth, wipe shaft and shaft sleeve and make certain that
they are perfectly clean.
3. Wet the 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. Use cardboard washer (usually supplied
with new seal), place over polished surface and use a piece of pipe or
dowel rod to press in rmly but gently. Avoid scratching polished face.
4. Dispose of cardboard washer. Check again to see that polished face is
free of dirt and all other foreign particles and that it has not been scratched
or damaged.
5. Wet the inside rubber portion of new seal head with a light coating of
soapy water. Slide head onto motor shaft with sealing surface facing seal
seat (see gure 2).
Note: A short “run in” period may be necessary to provide completely leak-free
operation.
6. Screw impeller onto shaft. Use screwdriver slot at rear of motor shaft
(opposite the threaded end) to tighten impeller.
NOTE: It may be necessary to remove plug in motor end cap to expose slot.
If removed, be sure to reinstall plug AFTER pump is completely assembled.
7. Check if shaft turns freely by spinning impeller. If rubbing or binding is
found, remove impeller and add a shim to shaft, then recheck. Repeat
procedure until all rubbing is eliminated.
8. Slide impeller seal onto exposed shaft. Screw acorn nut onto shaft and
tighten.
9. Place casing seal on adapter mounting ange. Attach casing using bolts
being careful not to pinch or “shave” casing seal. As casing is being
tightened, periodically spin impeller to check for interference with casing.
Seal will produce minor drag when spinning motor shaft, but rubbing
anywhere else must be eliminated! Otherwise, damage to pump and/or
motor may occur.
High Head Centrifugal Pumps
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AMT Pumps 489B-98

Specications Information and Repair Parts Manual 489 & 490 Series
4890-251-00 3 9/2016
For Repair Parts contact dealer where pump was purchased.
Please provide following information:
-Model Number
-Serial Number (if any)
Part description and number as shown in parts list
Figure 2 - Repair Parts Illustrations
Circulator Pump
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AMT Pumps 489B-98

Specications Information and Repair Parts Manual 489 & 490 Series
4890-251-00 4 9/2016
Part Number for Models
4893 (1/2 HP) 4895 (3/4 HP) 4890 (1 HP) 4902 (1½ HP) 4904 (2 HP) 4900 (3 HP)
4894 (1/2 HP) 4896 (3/4 HP) 4891 (1 HP) 4903 (1½ HP) 4905 (2 HP) 4901 (3 HP)
Ref 489C (3/4 HP) 489E (1 HP) 489A (1½ HP) 490C (2 HP) 490A (3 HP) -
No. Description 489D (3/4 HP) 489F (1 HP) 489B (1½ HP) 490D (2 HP) 490B (3 HP) - Qty
1 Motor - 1 PH ODP Discontinued Discontinued 1626-011-00 1626-012-00 1626-024-00 1626-026-00 1
Motor - 3 PH ODP Discontinued Discontinued 1626-015-00 1626-016-00 1626-025-00 1626-027-00 1
Motor - 1 PH TEFC 1626-302-00 1626-303-00 1626-304-00 1626-305-00 1626-306-00 - 1
Motor - 3 PH TEFC 1626-308-00 1627-309-00 1627-310-00 1627-311-00 1627-312-00 - 1
3 Fastener * * * * * * 4
4 Adapter - Cast Iron 4890-030-09 4890-030-09 4890-030-09 4900-030-09 4900-030-09 4900-030-09 1
Adapter - Bronze 4890-030-97 4890-030-97 4890-030-97 4900-030-97 4900-030-97 4900-030-97 1
Adapter - Stainless Steel 4890-030-98 4890-030-98 4890-030-98 4900-030-98 4900-030-98 4900-030-98 1
5&6 Shaft Seal Assembly - Buna N 1640-161-96 1640-161-96 1640-161-96 1640-161-96 1640-161-96 1640-161-96 1
Shaft Seal Assembly - Viton 1640-161-97 1640-161-97 1640-161-97 1640-161-97 1640-161-97 1640-161-97 1
Shaft Seal Assembly - EPDM/EPR 1642-421-00 1642-421-00 1642-421-00 1642-421-00 1642-421-00 1642-421-00 1
7 Impeller Shim Set 1806-044-90 1806-044-90 1806-044-90 1806-044-90 1806-044-90 1806-044-90 1
8 Impeller 4894-010-98 4896-010-98 4891-010-98 4903-010-98 4905-010-98 4901-010-98 1
(includes Ref. Nos. 7, 8 and 10)
9 Impeller Seal - Buna N Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT 1
Impeller Seal - Viton Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT 1
Impeller Seal - EPDM/EPR Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT 1
10 Impeller Fastener 1784-001-00 1784-001-00 1784-001-00 1784-001-00 1784-001-00 1784-001-00 1
11 Casing Seal - Buna N Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT 1
Casing Seal - Viton Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT 1
Casing Seal - EPDM/EPR Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT Incl. w/Ref KIT 1
12 Casing - Cast Iron 4890-001-95 4890-001-95 4890-001-95 4900-001-95 4900-001-95 4900-001-95 1
Casing - Bronze 4890-001-97 4890-001-97 4890-001-97 4900-001-97 4900-001-97 4900-001-97 1
Casing - Stainless Steel 4890-001-98 4890-001-98 4890-001-98 4900-001-98 4900-001-98 4900-001-98 1
(includes Ref. Nos. 3 and 12)
13 Fastener * * * * * * 4
14 3/8" NPT Pipe Plug * * * * * * 4
KIT O-Ring Kit - Buna N 4890-300-90 4890-300-90 4890-300-90 4900-300-90 4900-300-90 4900-300-90 1
O-Ring Kit - Viton 4890-301-90 4890-301-90 4890-301-90 4900-301-90 4900-301-90 4900-301-90 1
O-Ring Kit - EPDM/EPR 4890-302-90 4890-302-90 4890-302-90 4900-302-90 4900-302-90 4900-302-90 1
(includes Ref. Nos. 9 and 11)
(*) Standard hardware item, available locally.
Repair Parts List
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AMT Pumps 489B-98