Specifications Information and Repair Parts Manual
4897, 4906 and 4907
4897-251-00
1
9/2015
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.
©2015 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 Pedestal Pumps
Refer to pump manual 1808-634-00 for General Operating and Safety Instructions.
MAINTENANCE
Make certain that the unit is disconnected from the power source before
attempting to service or remove any components!
REMOVAL OF OLD SEAL
Should the mechanical seal (Ref. No. 6) require replacement, proceed as
follows and refer to Figures No. 1 and 2.
IMPORTANT:
Always replace both the seal seat and seal head to ensure
proper mating of components! Also, the impeller seal (Ref. No. 9) should be
replaced any time the impeller lock nut (Ref. No. 10) has been removed.
1. Remove four bolts (Ref. No. 3) connecting the casing (Ref. No. 11) to the
adapter (Ref. No. 4).
2. Remove the casing.
Care should be taken not to “pinch” or “shave” the O-ring gasket (Ref.
No. 5) between the adapter and the casing.
3. Use a box and/or socket wrench to remove the impeller nut (Ref. No.10).
Remove the impeller seal (Ref. No. 9) and the impeller (Ref. No. 8).
NOTE:
Pump shaft must be held in place to remove impeller. Impeller (Ref.
No. 8) and lock nut (Ref. No. 10) unscrew CCW when looking at the front of
the pump.
4. The seal head (part of Ref. No. 6) can now be pulled from the shaft. (See
Figure 2).
5. Pry the seal seat (part of Ref. No. 6) from the adapter (Ref. No. 4). (See
Figure 2).
INSTALLATION OF NEW SEAL
The precision faces on the mechanical seal are easily damaged. Handle
your replacement seal carefully. Do not touch the carbon/ceramic seal
faces.
IMPORTANT:
Be sure that shaft shoulder does not damage carbon face.
1. Thoroughly clean all surfaces of the seal seat cavity in adapter (Ref. No.
4).
2. Using a clean cloth, wipe the shaft and shaft sleeve to make certain that
they are perfectly clean.
3. Wet the rubber portion of the new seal seat (part of Ref. No. 6) with a light
coating of soapy water. While wearing clean gloves or using a clean light
rag, press seal seat squarely into adapter recess. Place the cardboard
washer (usually supplied with new seal) over the polished surface and
use a piece of pipe or dowel rod to press in firmly, but gently. Avoid
scratching the white ceramic face.
4. Dispose of cardboard washer. Check again to see that ceramic surface 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 the new seal head 9 part of Ref. No. 6)
with a light coating of soapy water. Slide head onto the motor shaft with
the sealing surface (Carbon) facing the seal seat (See Figure 1). This
completes seal installation.
NOTE:
A short “run-in” period may be necessary to provide completely
leakproof seal operation.
Rotation (Threaded Shaft Model)
1. Remove pump components from pedestal assembly:
a. Remove bolts (Ref. No. 3) from casing; remove casing and o-ring
(Ref. No. 5).
b. Remove impeller nut (Ref. No.10), unscrew CCW. Pedestal shaft
must be held in place to loosen nut.
c. Remove impeller o-ring (Ref. No. 9) and impeller (Ref. No. 8) turning
CCW while holding pedestal shaft in place. Remove impeller shims
(Ref.No. 7).
d. Replace seal as described in “Removal of Old Seal”.
e. Remove bolts (Ref. No. 13); remove adapter.
Reverse instructions to install pump on repaired pedestal assembly.
Failure to follow above information may cause impeller to unscrew and
damage pump head, cause property damage and/or personal injury.
DESCRIPTION
These pumps are non self-priming units designed for use where higher heads are required to handle liquid transfer, heating and cooling applications where no
suction lift is required. Pump construction features investment cast stainless steel closed impeller. The discharge port on all models can be rotated in 90º incre-
ments to accommodate specific applications. All units are for use with non-flammable liquids compatible with pump component materials. Units are suitable for
direct coupling or pulley drive. Pump rotation is CCW facing the front of the pump. No motor is supplied with these units.
Figure 1 - Mechanical Seal
