Specifications Information and
Repair Parts Manual
3161-95
16. Remount volute and position O-
ring in place.
IMPORTANT:
Always inspect O-ring.
Replace when cracked or worn. Wet
O-ring with soapy water for ease
of assembly.
17. Remount casing.
SHIM ADJUSTMENT
1.
When installing a replacement
engine, adapter, impeller, shaft
sleeve, volute or casing it may be
necessary to vary the number of
impeller shims (Ref. No. 8) that will
be required. This is easily done by
adding one shim more than was
removed and reassembling the
pump as described in MECHANICAL
SEAL REPLACEMENT section.
NOTE:
When adding or removing shims,
it is best to proceed with a 0.010"
increment each time. Remove spark
plug wire from engine and ground.
While tightening the unit together
turn the shaft (by pulling on the recoil
starter, etc.); feel for the shaft seizing.
If shaft begins to seize before the
fasteners are completely tight,
disassemble the pump and remove
one shim and repeat assembly.
2.
Once having added one shim more
than original, ensure that the
volute (Ref. No. 10) and adapter
(Ref. No. 3) are firmly fitted (check
fasteners Ref. Nos. 2 & 15). When
engine turns freely add shims until
it does strike, then remove a 0.010"
shim. This should allow the proper
clearance.
3.
Proper running clearance for the
impeller should be as close as
possible to volute without striking;
maximum clearance is 1/32"
(0.032").
4.
Follow the above procedure until
proper clearance is obtained. This
will ensure maximum performance.
1
1
/
2
-Inch Solids-Handling Pumps
Press in new seal
seat. Use a piece
of cardboard to
protect surface
while installing
Pry out seal
seat with
screwdriver
Carbon face (see
CAUTION below)
Lubricate before
assembly (see step
nos. 8 and 13)
Impeller
Seal seat
Adapter
Pump shaft
Shaft sleeve
Shim(s)
Figure 2 - Mechanical Seal Replacement
Seal head
Maintenance (Continued)
4