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John Deere Tractors Discussion Forum
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Another JD A starter question (Thanks Clooney JT)

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Jim M (RI)

10-03-2003 12:20:17




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I finally narrowed starting problem down to starter not working. Took it all apart last night. Ordered new brushes and other misc parts from John Deere today. Brass bearings were worn so I ordered them also. Two new questions: 1)How do I remove the old bearings and how to install the new ones? 2) How do I clean the starter parts? What solution shoud I use if any and can all parts be submerged? I assume armature can not, but what about starter case. Thanks again for all you help. Jim

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John T

10-03-2003 20:01:57




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 Re: Another JD A starter question (Thanks Clooney in reply to Jim M (RI), 10-03-2003 12:20:17  
Hey Jim, They make a puller to extract the old pressed in bushings, but since Im gonna replace them anyway, I pinch and pry and pull or use a chisel (bite into and turn or partly split or crush) or whatever it takes to get the old ones out of that hole but not damaging the inner bore. I think they make a puller for them, but Ive never owned or used one. I have a set of bushing drivers of various sizes to press/gently drive the new bushing in place. On any sealed pressed on bearings, if you can get a puller to bite on the inner race they can be pulled off or else use a bearign seperator down on the shaft against the inner race and they can be pulled that way.

I use soft wire brushes or scratch pads to clean and de rust the armatures outer steel core and be sure and clean out any grit or sanding residue. I soft wire brush the commutator segments. If the commutator is turned down or worn down badly, then the mica insulation between the segments needs to be cut down below the coppers surface or the brushes will bounce and not maintain good electrical contact.

I just use air and I personally NEVER dip any of the fields or the armature in any solvents or cleaners. You might clean/brush the fields iron cores (inside the case), but again, I never dip anythign that has the enamel and shellac and cloth insulations.

Once all is done, a thorough cleaning is necessary to remove any residue and have clean fresh grease in the bushing but not over greased so it gets all over the commutator and brushes.

Was the post out the starters side in good shape and not pitted or burned?? If so it should be replaced. I apply a light lithium grease coating on the starter drive gear and shaft.

Good Luck n God Bless

John T

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Jim M (RI)

10-04-2003 07:28:04




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 Re: Re: Another JD A starter question (Thanks Cloo in reply to John T, 10-03-2003 20:01:57  
John T. The terminal post has a "U" in the top of it. I never have seen one before so I don't know it that was there from the beginning or was wear, and if so how deep should it be. When I called John Deere to get the brushes, insulators, etc they told me the terminal post was not available any more. Surprisingly all the insulating washers were available so I ordered them. If that "U" was NOT supposed to be there I thought of trying to fill it with a brazing rod. Any ideas? Thanks, Jim

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John T

10-04-2003 11:05:22




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 Re: Re: Re: Another JD A starter question (Thanks in reply to Jim M (RI), 10-04-2003 07:28:04  
Jim, Im guessing what you call a "U" is where the switch has been contacting that post????? I believe I would just clean and wire brush it shiny and install a new starter switch and see how it does before tryign to braze anything as you mentioned. That stuff is pretty soft (its copper or some copper alloy??) and you may melt something and make things worse.

John T



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Clooney

10-03-2003 15:37:59




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 Re: Another JD A starter question (Thanks Clooney in reply to Jim M (RI), 10-03-2003 12:20:17  
Jim, to remove the bushings you can screw a proper fitting [fine thread] tap in & either drive the tap & bushing out with a drift or clamp the tap in a vise & drive the part off the tap & bushing... On a blind hole you can screw the tap in with nut or ball under it & force the bushing out. Or clamp a pair of vise grips on the tap & rap the vise grips with a hammer. Another way on a blind hole is to fill the bushing with grease & insert a loose fitting rod in the bushing then drive the rod in with a hammer [that will hydraulic the bushing out].

~To install the new bushings you should use a proper fitting bushing driver. In a pinch you can use a short bolt with a washer on it as driver or anything slightly larger than the bushing with a hard flat end on it. Be careful installing those bushings, if you damage them you won't be able to re-assemble the starter..

~As far as cleaning the parts..All the non-electrical parts can be cleaned with mineral spirits. On anything that still has electrical parts hooked to it [like the armature & case with field windings] I don't recommend ANY solvents, just a very low pressure air nozzle [solvents & high pressure air can damage the windings & insulation].

~You might want to use an old [narrow, grind the tooth offset flat] hacksaw blade & under cut the mica slightly between the commutator segments [just slightly below the surface of the commutator segments].Then use a non metallic fine sand paper & clean the outside of the commutator segments.

~Be sure to grease the armature end bushings before installing the armature & MAKE DARN SURE the internal wires are clear of ANY moving or rotating parts...

~Any questions? just post back or E-mail..

JDClooney@aol.com

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Bob

10-03-2003 22:38:31




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 Re: Re: Another JD A starter question (Thanks Cloo in reply to Clooney , 10-03-2003 15:37:59  
Do you commonly undercut starter commutators? I was taught only to undercut generator commutators.



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