"i bought new brushes and a bearing.
how hard is it to replace the brushes?
do i hsve to file them down or anything like"
BRUSHES
I just completed the overhaul of my Onan.
Replacing brushes was real easy with the
Onan on the bench.
The generator doesn't slide out far enough
to make it real easy but I am sure it can be done in
the coach. I wouldn't want to do it blind though,
the Onan manual (I think the same info is in the
GM manual) provides some useful pictures.
I didn't file the brushes. On mine the armature
did not need any work either.
Duane has some excellent info on the appropriate
bridge rectifier. I would replace it if doing brushes
When replacing the brushes I would be careful not =
to disconnect too many wires at a time. On mine they
were all the same color and would have been really
hard to reconnect correctly had I not marked them
before dismantling.
REAR BEARING
I suspect you have the generator out if you
are replacing the bearing at the rear of the
generator. =
Once the 4 threaded rods securing the generator case
to the motor are removed the case slides off the back
real easy leaving the armature hanging from the motor
(threaded rod through the center of the armature).
I used a pinion gear puller to remove the old bearing.
In my case I needed to remove the armature to replace
the rear bearing on the motor as well. To do so I had to
use a coupling nut on the threaded rod that passes
through the armature. If you are replacing the rear
bearing on the arnature rather than the one on the
motor then the armature does not have to be removed.
REASSEMBLY
On mine someone had left out the gaskets between
the generator case and the motor. Onan has them
listed as obsolete. I made new ones from valve cover
gaskets and some fuel hose slit lengthwise. Onan
cautions that overheating will occur (due to a short
circuit for the cooling air) if the gaskets are not used.
Good luck
Regards
Gary Zingle
1973 GMC 26 foot
how hard is it to replace the brushes?
do i hsve to file them down or anything like"
BRUSHES
I just completed the overhaul of my Onan.
Replacing brushes was real easy with the
Onan on the bench.
The generator doesn't slide out far enough
to make it real easy but I am sure it can be done in
the coach. I wouldn't want to do it blind though,
the Onan manual (I think the same info is in the
GM manual) provides some useful pictures.
I didn't file the brushes. On mine the armature
did not need any work either.
Duane has some excellent info on the appropriate
bridge rectifier. I would replace it if doing brushes
When replacing the brushes I would be careful not =
to disconnect too many wires at a time. On mine they
were all the same color and would have been really
hard to reconnect correctly had I not marked them
before dismantling.
REAR BEARING
I suspect you have the generator out if you
are replacing the bearing at the rear of the
generator. =
Once the 4 threaded rods securing the generator case
to the motor are removed the case slides off the back
real easy leaving the armature hanging from the motor
(threaded rod through the center of the armature).
I used a pinion gear puller to remove the old bearing.
In my case I needed to remove the armature to replace
the rear bearing on the motor as well. To do so I had to
use a coupling nut on the threaded rod that passes
through the armature. If you are replacing the rear
bearing on the arnature rather than the one on the
motor then the armature does not have to be removed.
REASSEMBLY
On mine someone had left out the gaskets between
the generator case and the motor. Onan has them
listed as obsolete. I made new ones from valve cover
gaskets and some fuel hose slit lengthwise. Onan
cautions that overheating will occur (due to a short
circuit for the cooling air) if the gaskets are not used.
Good luck
Regards
Gary Zingle
1973 GMC 26 foot
