American Stainless Pumps, Inc.
www.aspumps.com
5
Assembly or Reassembly
See page 7 for cross sectional drawings.
Assembly of the pump and motor is easier when the motor is standing face up so that parts do not fall off, although
access to the motor shaft at the rear of the motor will require a horizontal position.
It is considered good practice to replace the mechanical seal and o-rings whenever you have to disassemble the
pump.
1. If replacing the motor, remove the deflector from the motor shaft. There will not be enough room behind the motor
adapter plate for the deflector to spin freely.
2. Install the motor adapter plate (Item 600) with the four motor bolts (Item 7MB) using a 7/32” Allen wrench. You must
use the low profile button head socket screws that came with the pump or other low profile head bolts. Tighten the
bolts to approximately 120 inch pounds torque.
3. Install the shaft deflector. Slide the deflector up against the motor adaptor plate.
4. Install the mechanical seal stationary seat into the Seal Plate (Item 400) by putting a suitable lubricant on the rubber
cup seat and gently pressing the seat, cup end first, into the seal plate bore.
Do not get any lubricant on the seal
faces
. Use a soft cloth or other suitable item to protect the seal face from dirt and scratches while pressing into the
seal plate.
5. Place the seal plate onto the motor adapter plate. Observe that the shaft comes through the center of the seal
stationary face, and does not contact the seal stationary face.
6. Lubricate the sealing elastomers on the rotating assembly of the mechanical seal and press gently onto the shaft so
that the rotating face will contact the stationary seal face. Fully compress the seal ensuring face contact. You may
have to hold the seal in place until the impeller is installed.
7.
Model SSP Only:
Place the necessary number and thickness of impeller spacer/washers onto the threaded portion of
the shaft. If you are not changing the impeller or the motor, use the same batch of spacer/washers you removed when
disassembling the pump. See the section on
Setting Impeller Clearance
for procedures if you are changing the
impeller to case setting, or are building a new pump.
8. Thread the impeller onto the pump shaft, and tighten into place. You will need to hold the motor shaft from the rear of
the motor with a large screwdriver, wrench or vise grips while tightening the impeller.
Wear leather gloves to avoid
cuts when holding impeller while tightening.
9. If the motor is three-phase, install the impeller locking screw and washer (item 7SC). Use a thread locking compound
similar to Loctite® 242 on the locking screw. Make sure screw does not bottom-out in the bottom of the threaded hole.
10. Install the case o-ring (item 500) onto the sealplate. Replace if brittle, damaged or misshapen.
11.
Model SSPC Only:
Install the suction o-ring (item 510) into the groove on the inside of the suction nozzle. Replace if
brittle, damaged or misshapen.
12.
Model SSPC Only:
Join up the back pull out assembly with the case. Do not force the pump into the case. The
impeller o-ring (item 510) can be pinched by the impeller when installing. You may have to back out the pump from
the case, center up the impeller o-ring with your finger and slip in the pump assembly again. Before installing the case
bolts, check to be sure the impeller is spinning freely.
13.
Model SSP Only:
Insert the back-pull-out-assembly into the case.
14. If the pump has a stainless steel base plate (Item 800), align the two mounting holes on the base with the bottom two
casing screw holes.
15. Install the (8) case bolts (item 7CS), and hand tighten. Then tighten screws into place using approximately 80 inch
pounds of torque, and a cross bolting technique.
16.
Model SSP Only:
Check the impeller to case clearance per the following instructions for setting impeller clearance,
and adjust as needed.
17. Install and tighten the motor base hold down bolts.
