MP Pumps HYDRASUB 20_25 INSTRUCTION - Manual (Page 3)

REASSEMBLY:
1. Press the new lip seals into the pump housing using a suitable
bushing or socket. A light lubricant may be used to aid the
assembly. The proper assembly is to install the seals back to
back, installing one seal at a time.
2. Press the new ball bearing onto the shaft by pressing against
the inner face of the bearing until it is seated against the
shaft shoulder. The first lip seal should be installed open face
down and flat side facing out. The second lip seal should be
installed flat side in.
3. Lubricate the impeller side of the shaft with oil. Push the shaft/
bearing into the body using care to align the shaft at the
center of the lip seal until it is at the bottom of the shoulder in
the body. Install the snap ring to secure the shaft assembly.
4. Secure the shaft with a wrench on the flats of the shaft and
thread the impeller onto the shaft (note left hand thread).
Tighten the impeller until it shoulders onto the shaft.
5. Place new quad rings onto the thrust plate. Use a small amount
of grease to hold the quad rings from moving out of position.
Place the thrust plate over the shaft with the kidney slot up
away from the bearing. Kidney should be on the pressure
side of the motor.
6. Place the drive pin onto the shaft slot and hold it in
position with a screwdriver while sliding the gerotor
over the shaft and stopping at the thrust plate. Line
up the gerotor and thrust plate.
7. Install the cover onto the shaft; some sideways movement
of the gerotor is necessary. The dowel pins should go
through the thrust plate and into the body. Do not force this
assembly by using a hammer or press, it will slide together
when it is in position.
8. Install the four motor cover screws and torque to 17-ft.lbs
in a cross pattern with the first torque @ 10-ft.lbs.
9. Install the suction flange and screws.
10. Install the handle and screws.
11. Check for free rotation by rotating the impeller by hand. If it
does not rotate, remove the motor cover, clean the motor
parts, and reassemble. Dust and dirt granules will impede
motor rotation.
12. Install the cover plate using five screws and lockwashers.
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