6
Then, using a properly sized, unworn, Allen wrench, loosen first one pair of opposing bolts –
then the second pair. When all four bolts have all been loosened, remove all four bolts from
the case
15
and set them aside.
Locate the point where the front case and the iron lamination of the stator assembly meet.
With a small screwdriver, working around the case perimeter, gently pry the
front
case
assembly away from the stator assembly. At this point, you should gently pull the two
sections of the generator apart while taking care to support the considerable weight of the
rotor section which is normally supported by the needle bearing located in the rear case
assembly.
At this point, the rotor shaft end will likely have a bit of bearing grease on it. Wipe off this
grease and place the front case/rotor assembly onto your workbench.
As the rotor assembly is removed, the brushes will spring free of the brush guide. The
brushes must be returned to their guides, and be held in place. until reassembly of the
generator is complete.
For the model SR150 and SR250 series generators, the brushes can usually be pushed back
into place by hand (or by
gentile
manipulation with a pair of needle nosed pliers) and then
held in place by a straightened paper clip threaded through the holes provided in the brush
assembly, brushes
16
, and the rear generator case.
For the model SR200 series generators, the brush assembly must be removed from the rear
case in order to reposition, and secure, the brushes for reassembly of the generator.
Removal is simple, requiring only a 1/4” nut driver to remove the two #8 hex head machine
screws which hold the brush assembly in place. With the brush assembly outside of the
case, the brushes can be easily pushed back into place, by hand, and then held in place by a
straightened paper clip. As the brush assembly is reinstalled, the wire is threaded through
the holes provided in the rear generator case.
Step Three – Slip Ring Cleaning
The copper slip rings can usually be cleaned by simply by rubbing briskly with a rough cloth
soaked in denatured alcohol. Cleaning can also be accomplished by very carefully using a
strip of a very fine grade wet or dry polishing sandpaper - greater than 1200 grit. Though
this method presents some risk that the contour of the slip rings might be altered – possibly
affecting future performance and brush service life.
However, much better, safer, and quicker results can be obtained by using a common, and
popular, household metal polish designed for cleaning/polishing brass and copper – sold in
the USA under the trade name Brasso®. This compound will make quick work of the job,
leaving the copper slip rings bright and shinny with little chance of changing the contour of
the slip rings. Once clean, the slip rings should be wiped off with a cloth soaked in
denatured alcohol to remove any polish residue which might impair future performance.
At this time, the brushes should also be wiped off with the alcohol soaked cloth to remove
any greasy reside which may reside on the brush surface.
15
When removing SR200 series generator case bolts, take care to not loose the four stainless 3/8” nuts which are
used as spacers between the two sections of the rear housing assembly.
16
When brushes are new, holes in the brushes facilitate the use of a brush retaining wire. After some time in use
the, portion of the brushes with holes for the retaining wire will be worn away. At this point the brushes are not
worn out or unserviceable, only about a third of their useful service live has been expended.
Содержание 150 series
Страница 4: ......
