[Type text]
2851-252-00
1
9/2016
Specifications Information and Repair Parts Manual
2851,2852,2853,2855,2856,2857,285E,285F,285G,285H,285J,285K,285M,& 285P
x
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.
Self-Priming Centrifugal Pumps
Refer to pump manual 1808-634-00 for General Operating and Safety Instructions.
DESCRIPTION
These self-priming (to 20 ft. lift) (to 15 ft. lift on aluminum models without foot valve) are designed for general purpose liquid transfer. Pumps include a
semi-open clog resistant impeller. Handle liquids from 40º to 180º F (4º to 82º C) with Buna N seals and 40º to 200º F (4º to 93º C) with Viton
®
seals. For
use with non-flammable, non-abrasive liquids compatible with pump component materials.
PUMPS
Motorized units are direct coupled to a 3450 RPM motor. Single phase
pump motors have automatic reset thermal protection. All models are
manual mode and require field wiring; no controls are supplied. Check
motor wiring before putting unit into operation (see motor nameplate
for specific wiring diagram).
UNITS SHIPPED WITHOUT MOTOR
Some models are not equipped with motors. They are suitable for
mounting to 3450 RPM, NEMA 56J face threaded shaft motors with
counterclockwise rotation (looking at motor shaft). To find available
horsepower of motor, multiply rated horsepower by service factor. This
number must be equal to or greater than that required by pump.
ASSEMBLY
MOTOR (for units shipped without motor only)
1.
If any parts are missing or damaged, do not attempt to
assemble or operate pump until replacement parts are
obtained and properly installed.
2.
Verify that motor conforms to ALL standards specified in
"Description".
3.
Place motor in vertical position with shaft end up. Set
adapter (Ref. No. 4) on top of motor.
4.
See "Shaft Seal Replacement" and follow steps to complete
assembly.
MAINTENANCE
Make certain that unit is disconnected from power source before
attempting to service or remove any components! If the power
disconnect is out of sight, lock it in the open position and tag to
prevent application of power.
MECHANICAL SEAL REPLACEMENT
Refer to Figures 1, 2 and 3
IMPORTANT:
Always replace both the seal seat (Ref. No. 5) and the
seal head (Ref. No. 6) to ensure proper mating of mechanical seal
components!
NOTE:
It is not necessary to remove piping from pump casing. The
motor and impeller assembly are removed from back of casing.
1.
Unthread cap screws (Ref. No. 3) and remove pump casing
(Ref. No. 10) from adapter (Ref. No. 4).
2.
The motor used with this pump is a 56J frame. It has a
threaded shaft; impeller is screwed directly onto shaft. To
unscrew the impeller (Ref. No. 9), turn counterclockwise
(CCW) facing impeller.
NOTE:
A screwdriver slot or two flats for use with an open end 7/16"
wrench are provided at the rear of the motor shaft (remove bearing
cap for access). To hold the motor shaft from turning, either insert a
large screwdriver blade into the slot or use a 7/16" wrench across the
flats. Before removing impeller, remove impeller nut (Ref. No. 13) and
impeller seal washer (Ref. No. 14) (where applicable).
3.
Remove the adapter from the motor mounting face. The seal
head (Ref. No. 6) and impeller shims (Ref. No. 8) will come
loose at this time.
IMPORTANT:
Retain impeller shims for use when reassembling unit.
4.
Push seal seat (Ref. No. 5) from the adapter recess with a
screwdriver.
5.
Clean the adapter recess before inserting a new seal seat.
6.
Carefully wipe the ceramic surface of the new seal seat with
a clean cloth.
7.
Wet the rubber portion of the seal seat with a light coating of
soapy water.
8.
Press the new seal seat squarely into the cavity in the
adapter. If the seal seat does not press squarely into the
cavity, it can be adjusted into place by pushing on it with a
piece of cardboard between the pipe and seal seat to avoid
scratching the seal seat. (This is a lapped surface and must
be handled very carefully).
9.
After the seal seat is in place, be sure that it is clean and
has not been marred.
10.
Using a clean cloth, wipe the shaft and make certain that it is
perfectly clean.
11.
Secure the adapter (Ref. No. 4) on the motor mounting face.
Carefully guide motor shaft through the seal seat.
12.
Apply a light coating of soapy water to the inside rubber
portion of seal head (Ref. No. 6) and slide onto the shaft
(with the sealing face first) so that the rubber portion is just
up over the shaft shoulder.
13.
Replace any impeller shims which may have been removed
in disassembly (See "Shim Adjustment").
14.
Screw the impeller (Ref. No. 9) back in place, tightening until
it is against the shaft shoulder.
NOTE:
After impeller clearance has been set (See "Shim
Adjustment"), place a new impeller seal washer onto exposed shaft.
Screw impeller nut onto shaft and tighten (where applicable).
15.
Remount the pump casing (Ref. No. 10) on the adapter (Ref.
No. 4). (See "Shim Adjustment" if motor or impeller was
replaced).
IMPORTANT:
Always inspect the O-ring gasket (Ref. No. 7) for cracks
or cuts when unit is disassembled; replace if damaged.
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