AAF International Type W RotoClone - Manual (Page 8)

4.8 Shaft Seal
Other than routine greasing of the shaft seal (see 4.1 Lubrication), the
shaft seal requires no maintenance. Should the seal fail, replacement
of the two seals as shown in Figure 5 may be necessary. Since the
seals are “split” it is usually not necessary to remove anything, other
than the seals, from the shaft itself, unless damage to the seal housing
or metal spacer (located between the two seals) is evident. On the
smaller RotoClones, it may be necessary to loosen the bearing
closest to the seal and move it back about 6 inches, to gain clearance
to remove the seal housing. Be certain that the position of the shaft
in relation to the RotoClone is not changed in any direction when
doing this.
1. Remove the seal housing by removing the nuts securing it to the
scroll, and slide the housing back, exposing the seals and spacer.
Discard old seals.
2. Inspect the shaft and seal housing to insure that they are clean
and smooth. Remove any rust buildup with emery cloth or steel
wool. Inspect metal spacer; replace if necessary (this will require
removing bearings to slip spacer off the shaft and install new
spacer. Be sure to reposition impeller per Figure 6, before
tightening bearings back in place).
3. Place a small amount of silicone sealant between the radial cut
on each seal.
4. Install the new seals on either side of the spacer with the radial
cut at the top and the garter springs circling the inner lip of
each seal.
5. Insure that the radial cut in the metal spacer is located directly
below the grease fitting in the seal housing to allow grease flow.
6. Install the seal housing and tighten the nuts.
7. Lubricate the seal thoroughly with No. 2 grease.
8. Replace any bearings, if removed, in original position and
check impeller clearance per Figure 6 before tightening
bearings onto shaft.
4.5 RotoClone Impeller
Inspect the RotoClone impeller periodically for accumulations of foreign
material or obstructions in blade hooks. The blade hooks formed by the
leaving edge of the impeller blades convey the collected dust and water
out of the airstream. A build up of dust within these hooks may be
sufficient to cause pronounced vibration or dust and water entrainment.
Such accumulations should be removed either by flushing with high
velocity water jet or scraping with long screw driver through access door
in back of RotoClone housing and from front side of impeller.
Flat spray of flushing nozzle located at impeller (7 o’clock position,
viewed form the inlet) should be parallel to blade edges. Check this
spray with water on periodically to ensure proper positioning and spray
pattern.
Certain accumulations in RotoClone impeller cause no difficulty and can
be disregarded. They include minor deposits on back of impeller blades,
slight coating or small deposits on front side of blades, and slight
deposits in blade hooks that do not obstruct flow of dust and water.
4.6 Drains
Keep all drains clean. If necessary flush out periodically. A plugged
drain can cause damage to the impeller. Inspect grating in bottom of
the Arr. D RotoClone hopper periodically and remove any accumulation.
4.7 Emergency Overflow (Arrangement D only)
An emergency overflow is provided on side of hopper to drain off
the water in case hopper drain pipe becomes clogged. This stoppage
must be cleared immediately.
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