PREVOST LE MIRAGE XLII BUS SHELLS, Руководство по обслуживанию

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Section 22: HEATING AND AIR CONDITIONING
PA1564
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FIGURE 25: EVAPORATOR MOTOR ASSEMBLY
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9.3.4 Brush Wear Inspection and
Replacement
CAUTION
Only use replacement brushes recommended
by the manufacturer. Not doing so will void
warranty.
Replace the brushes if less than ¾ inch (19
mm). New brush length is 1-¼ inch.
To replace brushes, proceed as follows:
1. Set ignition key switch to the “OFF” position.
2. Remove the protective screen band from the
motor housing by pulling down the spring
loaded fastener.
3. Lift the spring, remove and replace brushes
as per the following procedure: “SEATING
BRUSHES”.
4. Reverse installation procedure.
9.3.5 Seating Brushes
Grinding consists in giving to the seating face of
a new brush the exact same curvature of the
commutator so that good mechanical and
electric contact of the brush is made.
NOTE
The new motor brushes are provided with a
preformed seating face which is approximately
the same curvature as the commutator.
Grinding/honing will give an exact match in
curvature.
The advantage of preforming is to
appreciably shorten the time required for
grinding.
For best results, remove oil and grease from
commutator before applying brush seater.
Grinding is generally done on the machine itself,
in accordance with various processes' and
conformably to the importance and the type of
machines:
a) Grinding with abrasive cloth (60 grit
sandpaper) applied to the commutator must
be done by hand. With the new brushes
installed in brush holders and pressing
against the abrasive cloth, rotate the
armature (by hand) until satisfactory seating
of each brush is achieved (Refer to figure
26). It is necessary to avoid raising the cloth
under the brushes otherwise it would result,
after grinding, to reduce and badly definite
surfaces (Refer to figure 27).
FIGURE 26: PROPER GRINDING TECHNIQUE
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FIGURE 27: IMPROPER GRINDING TECHNIQUE
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