Re: H Starter short circuit

Posted by captaink on December 14, 2005 at 19:25:33 from (64.33.250.37):

In Reply to: H Starter short circuit posted by Rock2k on December 14, 2005 at 17:23:06:

With the starter completely disassembled there should be infinite resistance (no conductivity) between the post the battery cable hooks up to and the starter field housing. Also as you touch all the bars around the commutator (the copper bars on the armature that the brushes ride on) there should be conductivity between them but not to the steel part of the armature or armature shaft.

Sometimes if the bushings are worn enough the armature can drag on the field housings and cause enough heat to melt the insulation and cause an internal short in the windings. If you have a growler (older device for testing internal shorts in armatures) test it (or take it to a place that has one like an automotive machine shop) to make sure it isn’t internally shorted. Check the brush connections. Two of the brushes should have a braided wire to the housing end cap, and the other two should be connected to the field windings (taken out from the access holes behind the narrow band on teh commutator end of the starter) which connect to the post on the field housing that the battery cable connects to.

While the starter is completely disassembled if you have current flow from any copper part (including brushes) to a steel part (except brush holders), this is where the short is at. Once the starter is assembled, then there will be conductivity, since that is how electric motors work.

If you don’t find a short after the above tests, I would recommend replacing the bushings and the brushes get a good brush arm and put it back together and bench test it. You won’t have much in it.

Good luck. e-mail me if you have questions.

Replies:

• Re: H Starter short circuit Rock2k 20:29:20 12/14/05 (3)
  • Re: H Starter short circuit captaink 06:30:07 12/15/05 (2)
    • Re: H Starter short circuit Rock2k 09:49:38 12/15/05 (1)
      • Re: H Starter short circuit captaink 10:10:14 12/15/05 (0)

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]