7
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®
Co. All rights reserved.
Cutter Maintenance
General Maintenance
FIGURE 7.
1.
All power circuits must be disconnected and locked out before
any attempts are made at servicing.
The cutter and disc can be
removed and sharpened by grinding the cutting faces. Both cutter
and disc must be removed from the pump. Removal of these parts
can be accomplished in the field by removing pump from the sump
and positioning horizontally to access the intake of the pump. If seals
or other repairs are required, the pump must be totally removed and
serviced in a shop by a qualified pump technician or authorized service
center.
2. Thoroughly clean the cutter and disc assembly. Tilt pump back to
the vertical position to make certain the end play has been removed.
Check and record the clearance between the cutter and disc with a
feeler gage. The correct running clearance is between 0.007" and
0.012".
3. With pump in horizontal position, heat the hex head bolt in the center
of the cutter with a propane torch. The bolt must be heated to 350°
F to soften the thread lock sealer on the bolt for ease of removal.
Remove the bolt by turning in a counterclockwise rotation. It will be
necessary to use a wood block to prevent the cutter from turning while
removing the bolt. Pull cutter from the shaft and remove the spacer
shims located behind the cutter.
4. Remove the six cap screws holding the disc and remove disc from
the pump.
5. The disc and cutter can be replaced with new service parts or resurfaced
by grinding. Resurfacing is accomplished by surface grinding both
disc and cutter to a 32 micro finish. Do not attempt grinding in the
field. Send parts to a qualified machine shop or return to the factory
for repair. The disc, cutter and shims are a matched set. Keep parts
together. Measure disc before and after resurfacing with micrometer
and record measurements.
6. After resurfacing, the disc and cutter must be flat within 0.001". If the
disc has been surface ground, it will be necessary to remove shims
to compensate for the material removed from the disc. As a starting
point, remove shims of the same thickness as the amount machined
from the cutter disc (step 6 above). Final running clearance must be
between 0.007" and 0.012". Be sure pump is in vertical position and
all end play has been removed before measuring.
7. Clean bottom of pump where disc is located and replace disc and
retainer screws. Torque to 63-67 in-lbs. Replace cutter with the
correct shims. Install washer and torque hex head bolt to 71-75 in.-lbs.
apply Loctite 262 thread-lock sealant or equal to bolt threads prior to
insertion. Check running clearance with pump in vertical position to
remove end play. Clearance must be between 0.007" and 0.012" to
obtain efficient grinding when pump is put back in service.
8. Check the oil in the motor housing before reinstalling. Contact the
factory if the oil has a milky appearance or burnt smell. The level
should be even with the fill plug when pump is in the upright position.
Add oil if required. Use insulating oil supplied by the factory.
To remove cutter: Heat the center bolt to
350°F to loosen Loctite® thread sealant.
Grind the Cutter and Disc seen here to a 32 microfinish.
Surfaces must be flat to within 0.001" T.I.R. Gap must be
between 0.007" and 0.012" on these parts.
Repair and service should be performed by a Zoeller
Authorized Service & Warranty Center or Customer Care Center only.
SAFETY PROCEDURES
For your protection, always disconnect pump
and panel from its power source before handling.
Never enter the basin until it has been properly
vented and tested. Any person entering a basin should be wearing
a harness with safety rope extending to the surface so that they
can be pulled out in case of asphyxiation. Sewage water gives off methane
and hydrogen sulfide gases, both of which can be highly poisonous.
Installation and checking of electrical circuits and hardware should be performed
by a qualified electrician.
Pump is never to be lifted by power cord.
Unit must be cleaned and disinfected, inside
the pumping chamber and all exterior surfaces, prior to servicing.
GENERAL SYSTEM INSPECTION
Before the system is placed into operation, it should be inspected by a qualified
technician.
Wiring and grounding must be in accordance
with the National Electrical Code and all applicable local codes
and ordinances.
LUBRICATION PROCEDURES
No lubrication is required.
If pumps are to be stored for more than six months, refer to short-term storage
procedure in the Operation section.
PREVENTIVE MAINTENANCE
Preventive maintenance is recommended to ensure a long service life from the
product. Provided is a suggested maintenance schedule.
Every year:
• Inspect basin, report any sighting of grease accumulation.
• Check for proper and unobstructed float operation.
• Listen for proper check valve operation.
Every 8 years or 2,000 hours of operation:
• Remove pump, inspect and service using a Zoeller rebuild kit.
• Flush and clean basin.