21
6. Remove the backplate.
7. Remove the old stationary seat out of the backplate.
8. For motor replacement, remove the bolts holding the motor adapter to the front of
the motor. Remove bolts holding the motor to the base.
9. Clean all stainless steel parts with a clean cloth and if necessary some acetone. Check
if the O-ring is still in good condition and replace if necessary.
10. Reassemble the motor to the base and motor adapter if necessary.
11. Put the backplate in the adaptor. Sub merge the stationary part of the mechanical
seal in the 5 % soap solution and press it with your hands in the front side of the
backplate. Ap ply an equally spread pressure and press it completely into place. Never
use an oil-based lubricant, it can damage the rubber parts of the seal.
12. Submerge also the rotating part of the same seal in the soap solution and slide it on
the shaft of the impeller (sealing face away from the vanes). Clean both sealing faces
with a clean lint free cloth.
13. Apply a light coating of thread lubricant to the end of the motor shaft. Screw the
impeller on the shaft and fasten it with a torque wrench set on 28 Nm, while holding
the motor shaft at the back of the motor. The impeller should have a .5mm clearance to
the backplate.
14. Put the casing O-ring and pump casing back on the front of the pump. Fasten the
bolts.
Refer to exploded view drawings on page 24 for added detail.
S2 Series
For the replacement of the mechanical seal a 5 % soap solution is needed.
1. Remove casing bolts.
2. Remove back pull-out assembly from casing. On close coupled units, the back pull
out assembly consists of everything but the casing.
4. On close-coupled units, remove the motor end plug or cover to expose a
screwdriver slot or flats on the end of the motor shaft.
5. While restraining the shaft with an appropriate tool (close coupled units) remove
impeller bolt.
6. While wearing work gloves, move the impeller from side to side until it is free and
slides from the shaft. A 1/2-13 bolt may be threaded into the impeller bolt hole to assist
in driving off the impeller.
7. Remove the impeller and the back plate. Inspect the condition of the o-ring on the
back of the impeller. If it is still in good condition, only the rotary and stationary
elements need to be replaced. If the o-ring appears to be damaged, follow the steps at
the end of this section.
8. Remove the old seal out of the back plate and from the impeller shaft.
9. For motor replacement, remove the bolts holding the motor adapter to the front of
the motor. Remove bolts holding the motor to the base.
Summary of Contents for GSP Series
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