Garden - Recent Questions, Troubleshooting & Support
How do I remove starter & replace brushes in a 446 Case garden tractor.
Hello, rebuilding a starter is not hard... First.. disconnect the battery!! Tie back the connector! There should be one heavy wire going to the starter.. remove it.. tie it back out of the way..There might be 2...or 3.. or 4 bolts/nuts holding the starter on, once they are removed you can remove the starter..DO NOT tap on the round outside housing!! Get a couple clean rags on your work bench.. the starter will have 2/3 long bolts -- or short bolts/nuts/screws on each end.. -CAREFULLY NOTE HOW IT COMES APART- ..remove these...once you have removed each end.. the armature is heavy and the stator is magnetized..remove the armature .. watch for falling shims/washers that belong on the shaft and make sure they go back in the same way!! Now its time to inspect the armature/commutator for wear or damage.. you need to turn/mill/machine the brush's contact area on the commutator to give the new brushes full contact (and, now, this properly done rebuild will last a long time!!).. once the area is flat, smooth, clean and de-burred you need to make sure the MICA UNDERCUT is correct..the "plastic looking" area between each of the little commutator lands must cleaned out/lightly scraped out so there is NO CHANCE the brushes will contact the undercut area! Once this is done correctly,, you will have a nice clean and freshly surfaced commutator! Make sure the bearings are free/bushings are clean, make sure the shims/washers are in place and reinstall the armature..The new brushes come as an assembly (easiest way) or two/four brushes to be installed in the old plate..(yuk)..you have to ma ke sure the brushes are pulled back/locked out of the way.. sometimes you can just move the spring off the brushes and that work great..another way to lock the "out' is with a bobby-pin/hair pin folded into a locking "spring". Once you have the armature/washers/shims/brush plate correctly assembled its time to put the bolts/nuts together and SLOWLY tight everything.. If you have done this correctly the armature should have a noticeable "rumble/feel the magnets working" when turning it by hand..thats the magnets doing their job..Check the armature shaft for excessive and play (did you leave out any shims or washers?).. if it feels right... just re-install in reverse of disassembly.Good Luck!
IF YOU CANNOT DO ALL THIS..just take the starter to a shop that you trust... Now its almost as cheap and easy just to buy a lifetime warranty one from a major auto store.
7 hours ago
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