MYERS SX50, Инструкция по установке и обслуживанию

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3. Using a proper wrench, the impeller retaining
nut must be removed. This may require a piece
of wood placed between the vanes to keep the
impeller from rotating while removing the nut.
Loctite
®
is used on this bolt and heating to
450–500°F may also be required to loosen. The
impeller is mounted on a threaded shaft. To
remove impeller, rotate impeller with one hand,
while holding pump shaft with screwdriver.
4. If the lower seal needs to be removed, first
remove the compression spring that rides
between the impeller and the seal assembly.
Next take a pair of screwdrivers and remove
the compression ring that surrounds the rubber
bellows on the rotating portion of the seal
assembly. Again using the screwdrivers, pry the
remaining portion of the rotating seal assembly
off the shaft. The ceramic stationary can be
removed by placing a screwdriver between the
rubber and the ceramic face, and then prying,
working around the entire diameter. Note,
these parts should be discarded and a new seal
assembly installed.
5. If the oil in the seal chamber was drained,
examine the contents to determine if the upper
seal has been damaged. Signs of grit or other
abrasive material may indicate that the upper
seal has also been damaged. Pressurizing the
motor housing assembly between 7 and 10 psi
and observing any drop in pressure will indicate if
the upper seal is functioning properly.
Note: Upper seal repairs must be done at a Myers
authorized service center or at the Myers factory.
Any unauthorized field repair voids warranty and the
CSA listing.
Reassembly
1. Remove the ceramic portion of the new seal from
the package. Brush new dielectric oil around the
rubber portion of the stationary assembly and into
the pocket in the seal housing. Note, keep the
oil off the seal face. Without scratching the seal
face, press the ceramic stationary portion into the
seal housing. A piece of PVC pipe that fits onto
the face of the seal works well for installation.
With clean cloth, lightly wipe the face of the seal
surface to make sure it is dirt free. Remove the
rotating portion of the seal from the package and
lubricate the inside diameter of the rubber bellows
and the outside diameter of the shaft. Place the
seal over the shaft. Evenly press on the body
of the rotational assembly and slide it down the
shaft until the seal faces meet. A PVC pipe with
the inside diameter slightly larger than the shaft
diameter can work well to press the rotational
assembly into position. Once the seal assembly
is in position, place the spring over the register on
the rotational portion of the seal.
2. Thread the impeller onto the shaft, making sure
that the seal spring is registered properly onto
the back side of the impeller. Place the proper
Loctite fluid on the impeller retaining nut. Tighten
nut on shaft.
3. Fill the seal chamber with new dielectric oil. An
air gap of 10–15% volume must be left for the
expansion of the oil when it is at operating
temperature.
4. The motor and impeller assembly can be installed
into the volute, making sure that the units are
aligned properly. Install the volute retaining bolts
and tighten.
5. Air tends to trap in the pump case when water
rises in the sump or when the pump is lowered
into the water after service. To vent off this air a
small hole is drilled into the volute casting. Be
sure this vent hole is clean after any service
work on pump . Air venting is not a problem after
initial start.
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