Specifications Information and Repair Parts Manual
316A-95, 316B-95, 393A-95, 393B-95,
394G-95, 394H-5, 394J-95, 394K-95, 399D-95
394K-250-00
3
1/2017
NOTE:
When the clearance between the impeller and the volute exceeds 1/16”
at the face of the impeller or 1/8” on the outside diameter of the impeller, it may
be necessary to take corrective action. The increased clearance can cause
lengthened priming times and reduce pumping capacity. If both the priming and
capacity of your unit are satisfactory for your application, it is recommended
that no corrective maintenance be performed regardless of what clearances on
your unit may have developed, since the increased clearances in themselves
are not generally harmful to your pump.
Normally, new pump clearances can be restored by simply shimming
behind the impeller. (Add impeller shims). If the impeller is badly worn, it is
recommended that the impeller be replaced. This is usually all that is required
since only on unusually abrasive service does the cast iron wear plate and
volute show deterioration. Occasionally a stone or hard object might get caught
in the impeller and cause damage to the volute. In these cases, follow the
instructions below for replacement and refer to the associated Repair Parts
Illustration.
1. Disassemble pump for access as described in MECHANICAL SEAL
REPLACEMENT, steps 1, 2, &3.
2. Replace parts as necessary.
NOTE:
When replacing volute attach check valve (316 & 393: Ref. No. 16) or
volute gasket (394 & 399: Ref. No. 35) to new volute.
NOTE:
Before installing new parts, clean all mating surfaces thoroughly.
CLEANING
394 & 399 pumps are equipped with a removable cleanout cover (Ref. No. 28).
To access impeller and suction chamber remove two handles (Ref. No. 29) pull
the cleanout cover and gasket (Ref. No. 31) from the casing. Clean out any
debris to unclog suction.
NOTE:
When replacing clean out cover plate, carefully wipe clean all surfaces
on which the gasket has contact. Also, make sure the gasket is in position.
All pumps can be cleaned or unclogged by removing the casing and volute.
Refer to MECHANICAL SEAL REPLACEMENT, steps 1 & 2.
FLAPPER VALVE CLEANING
If debris clogging the flapper valve becomes a constant problem, the flapper
area can be cut from the perimeter gasket area and removed from the pump. It
is important that the perimeter of the flapper valve remains to seal the inlet area
of the casing/volute from the discharge area.
NOTE:
Priming efficiency will be reduced if flapper portion is removed.
NOTE:
Do not remove entire flapper valve. Perimeter of valve must remain;
remove only the flapper area. The pump will not prime and performance will be
affected if entire flapper valve is removed.
Sewage/Trash Pumps
Summary of Contents for 316A-95
Page 15: ......
Page 16: ...www amtpump com...
