Maintenance
Manual
7
Ampco
Pumps
Company
1. Disconnect the pump from both suction and discharge piping.
2. Remove the shaft cover guard at this time by taking off the cover guard bolts.
3. Remove cover by taking off the casing nuts. A rubber mallet may be necessary to loosen the nuts.
4. Remove the impeller nut (bolt) using a 15/16” socket (7/8” for sp240 pump)
and holding the stub shaft with a 3/8” rod in the
predrilled hole. Ease the impeller off the shaft. Pinch bars between the impeller and cover may be required. Be careful not to
mar the pumps surface finish. Remove the impeller.
5. Use a 3/4” wrench to remove all three bolts between the pump volute and the adapter and gently slide the pump volute off the
pump
shaft.
6. Lay the pump volute down on the casing studs, and remove the stationary seal. The wave springs for the seal should also be
removed. In double seal pumps, there is an extra stationary piece and wave spring to remove.
7. Remove the two stationary seal O-rings. This is best done by using a small flat-blade screwdriver.
8. Remove the rotating seal and rotating seal O-ring from the stub shaft.
The Mechanical Seal is the only expendable pump part. It is suggested that the complete mechanical seal, both stationary
and rotating members, be replaced whenever dripping or leakage occurs at the shaft, or whenever parts are removed to the
point of separating the primary sealing surfaces.
The fluid end is now completely dismantled: Additional procedures are dictated by purpose for which unit was disassembled.
Mechanical Seal Replacement and Reassembly
Please see the table on pages 4 and 5 for proper identification of all pump components.
1. Begin by installing the rotating assembly onto the stub shaft. Lubricate the rotating O-ring with a food grade lubricant (use de-
ionized water if oil is not permitted i.e. EPDM) and fit it into the rotating seal. Slide the assembly onto the shaft and line it up
with the notches on the shaft.
2. Set the pump volute down on the casing studs. Lubricate the inner stationary seal O-ring and put it in the groove in the seal
cavity. For double seal pumps, the outer stationary O-ring fits into the larger groove in the seal cavity.
3. Place the inner (and outer) wave spring into the seal cavity and align it around the pins in the seal cavity. The wave spring should
be positioned so that the waves with the notches face downward by the pins.
4. Install the inner stationary seal. The notches in the seal will line up with the pins in the cavity. For a double seal, install the outer
rotating seal second.
5. Being careful not to bump the seal on the pump stub shaft, gently slide the volute over the stub shaft and shoulder it against the
adapter.
6. Use a 3/4" wrench to alternatively tighten all bolts between the volute and the adapter.
7. Place the impeller key onto the shaft keyway in the pump.
8. Lubricate impeller O-ring and fit into the groove on the back of the impeller
Ampco
Pumps
Company
SP
Series
Manual
M
‐
015
RevC
6.19
