SP | Dissasembly
DISASSEMBLY
If you need to replace impeller, wear plate, shaft
seal, front oil lip seal, bearing or check valve,
follow these steps:
1. Drain pump casing completely by removing
drain plug from both suction and discharge
chamber.
2. Drain seal cavity oil by removing drain plug
from bearing housing.
Note: A mixture of oil and water does not
necessarily indicate a seal failure. Inspect seal for
damage and replace if needed.
3. Drain bearing cavity oil by removing drain plug.
Note: If oil is mixed with water, shaft seal and front
oil lip seal must be inspected for failure.
4. Remove bearing housing support cap screws
from base.
5. Disconnect coupling or V Belt.
6. Remove cap screws, which holds seal plate to
casing.
7. Pull complete assembly including bearing
housing assembly, seal plate and impeller from
pump casing.
8. Remove impeller nut & impeller washer from
the shaft. Pry out the impeller using wedges
behind the impeller.
Note: Check impeller for any broken vanes or wear.
If it is necessary, replace it.
Refer to impeller-nut torque value before
reinstalling impeller nut.
9. Remove wear plate by removing locknut
through the clean-out cover hole. Check wear
plate for wear. Replace if required.
10. Remove seal assy from seal well as follows:
a. Remove spring and rotating element of the
seal.
b. Pry out the stationary element gently from
the seal cavity by using screw driver. OR if
seal plate is removed from the shaft, the
stationary seal will slide out of the shaft
along with seal plate. Be careful not to
damage stationary element by letting it hit
the shaft.
Note: Before reinstalling seal assy make sure that
the rubber O-ring and both mating silicon-carbide
rings, rubber bellows and shaft surface under seal
are in good condition. Make sure to lubricate with
water before reinstalling. If necessary, replace seal
assembly.
11. Remove cap screws to disassemble bearing
housing from seal plate.
Note: Check gasket - if worn, replace it.
12. Remove the shaft assembly with bearings and
bearing carrier out of the bearing housing.
13. Check both lip seals, replace if necessary.
14. Remove the snap ring from the bearing
carrier which will allow the bearing carrier to
slide off the shaft, along with O-ring.
15. Remove snap ring from the shaft.
16. Check the bearings. If they feel rough when
turning by hand, replace the bearings. Remove
bearings from the shaft using a hydraulic
press.
17. If your pump is supplied with a shaft sleeve,
the sleeve is locked in place with a roll pin and
an O-ring to prevent leakage under the shaft.
To remove shaft sleeve, push the roll pin into
the shaft (shaft has a drilled through hole) and
pull the sleeve from the shaft along with the
O-ring. Push the roll pin out of the shaft. Pump
with slotted shaft sleeve, pull the sleeve along
with O-ring from the shaft. If roll pin is
damaged, pull roll pin out of shaft. Replace
shaft sleeve, O-ring and roll pin if necessary.
Check O-ring and shaft sleeve. If damaged,
replace as necessary. When reinstalling the
sleeve onto the shaft, make sure that the roll
pin is installed flush or max. 0.13mm under
the sleeve O.D.
Follow the above procedure in reverse to
reassemble the pump.
Note: (1) Make sure all gaskets, O-rings, and
sealing surfaces of the check valve are in good
condition before reassembly. Replace as is
necessary.
(2) Make a heavy bead of "GASKET ELIMINATOR"
Loctite #518 or equivalent all around the outer
edge, inner edge and around the mounting holes
on the wear plate before reinstalling wear plate
onto the pump casing for sealing.
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