Generators and Motors
[Home] - [HELP] - [Forums] - [Articles] - [Photo Gallery] - [Groups] - [Chat] - [Classified Ads] - [Subscribe] - [Links] - [Books] - [Sponsors] - [Tools]

Go Back   SmokStak > SmokStak® Vintage Electrical Equipment > Generators & Motors General Discussion
Forgot Password? Join Us!

Notices

Generators & Motors General Discussion Antique Generators, Light Plants and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Motors General Discussion

Need advice on removal of gen rotor from PTO shaft


this thread has 10 replies and has been viewed 4247 times

Reply
 
Thread Tools Display Modes
  #1  
Old 12-30-2008, 10:31 PM
mbdittmar mbdittmar is offline
Registered-II
 
Join Date: Dec 2007
Location: Westminster, CO
Posts: 72
Likes: 9
Liked 72 Times in 6 Posts
Default Need advice on removal of gen rotor from PTO shaft

I have a Briggs and stratton engine which was formerly running an agtronic generator head. The gen head turned out to be toast, but the engine is good, so I wanted to remove the gen head. I have everything off except the gen rotor, and I'm not sure how it is supposed to come off ( see attached pics ) off the PTO shaft. It almost looks like it is pushed on the shaft and held in place internal to the engine, but I'm not sure. I'd rather not remove the side plate if I don't have to! This is a model 190432 type 5130, and is a flange mount ball bearing PTO ( no gear reduction ) BTW, Those gray things are just remnants of a fan and are attached to the rotor coil, they don't impact anything. Anybody come across something like this who could offer me some advice ? Thanks !
Attached Thumbnails
P1010143.JPG   P1010146.JPG  
Reply With Quote
Sponsored Links
  #2  
Old 12-30-2008, 11:26 PM
Gailey Henderson Gailey Henderson is offline
Subscriber
 
Join Date: Nov 2004
Location: Williamstown, West Virginia
Posts: 143
Likes: 4
Liked 43 Times in 35 Posts
Default Re: Need advice on removal of gen rotor from PTO shaft

A long bolt through the rotor the engine shaft is tapered
Reply With Quote
  #3  
Old 12-30-2008, 11:40 PM
Mikey4026's Avatar
Mikey4026 Mikey4026 is offline
Subscriber
 
Join Date: Jan 2008
Location: Eatonville, Washington
Posts: 563
Likes: 241
Liked 183 Times in 127 Posts
Default Re: Need advice on removal of gen rotor from PTO shaft

Some rotors have threads on the inside of that bolt hole that Gailey mentioned, you can thread in a legenth of all thread to push the rotor off the taper.
How many horses do you have there? I have a good 4400 watt end.
Mikey
Reply With Quote
  #4  
Old 12-30-2008, 11:58 PM
mbdittmar mbdittmar is offline
Registered-II
 
Join Date: Dec 2007
Location: Westminster, CO
Posts: 72
Likes: 9
Liked 72 Times in 6 Posts
Default Re: Need advice on removal of gen rotor from PTO shaft

Yes, there was a long bolt which went through the rotor shaft, which I removed. I'm guessing it may take some force to get it off of the taper? I tried to pull the rotor off by prying with a crowbar but no luck. I'm not sure how far the threads extend back in the shaft, but I'll give the all thread a try.

BTW, it is an 8 hp motor.
Reply With Quote
  #5  
Old 12-31-2008, 01:25 AM
mbdittmar mbdittmar is offline
Registered-II
 
Join Date: Dec 2007
Location: Westminster, CO
Posts: 72
Likes: 9
Liked 72 Times in 6 Posts
Default Re: Need advice on removal of gen rotor from PTO shaft

Well, I tried taking the original bolt and adding a bunch of washers underneath it, so the bolt should act as a puller. If I understand correctly the PTO shaft is threaded, and the rotor is just held on with this long bolt ? So, really tightening down on the bolt with added washers should have pulled the rotor off, I think. Is that right ? Unfortunately this didn't work.

If this is correct, this rotor must be frozen tight onto the shaft.
Reply With Quote
  #6  
Old 12-31-2008, 02:33 AM
half-fast half-fast is offline
Subscriber
 
Join Date: Nov 2005
Location: Isabel, South Dakota, USA
Posts: 66
Likes: 2
Liked 10 Times in 7 Posts
Default Re: Need advice on removal of gen rotor from PTO shaft

The rotor is a friction fit on a taper on the end of the crankshaft PTO end. Any pressure from tightening a through bolt in the rotor will force the rotor tighter on the crank. What I do is #1. Take a tap and tap threads inside the bore through the center of the rotor about 3/4 to 1 inch. #2. Build a push rod to extend through the center of the rotor against the crank so that it is about 1/2 to 3/4 inch deep in the rotor. #3. Turn a cap screw into the thread against the push rod to pull the rotor. NOTE: I turn a pilot on the end of the push rod that goes through the threads in the crank to protect the crank. Also the diameter of the push rod should be ideally as large as possible and still able to slip through the rotor or it will bend and crush due to the length. It requires tremendous pressure on some of these to remove. Where you have pulled the rotor even tighter on this one it will probably be tough. This is similar to pulling a snowmobile clutch. Good luck.

Happy New Year!! Denny
Reply With Quote
The Following User Likes This Post:
  #7  
Old 12-31-2008, 02:50 AM
mbdittmar mbdittmar is offline
Registered-II
 
Join Date: Dec 2007
Location: Westminster, CO
Posts: 72
Likes: 9
Liked 72 Times in 6 Posts
Default Re: Need advice on removal of gen rotor from PTO shaft

Thanks, I'll try this method out....it makes a lot of sense.

Not sure what I was thinking !
Reply With Quote
  #8  
Old 12-31-2008, 04:15 AM
armandh armandh is offline
Sponsor
 
Join Date: Aug 2006
Location: Suburban St. Louis, Missouri
Posts: 1,935
Likes: 36
Liked 329 Times in 295 Posts
Default Re: Need advice on removal of gen rotor from PTO shaft

like ball joints and tie rod ends
once the removal preasure is on
a good smack to the side of the taper joint will shock it loose
Reply With Quote
  #9  
Old 12-31-2008, 09:48 AM
K D Redd K D Redd is offline
In Memory Of
 
Join Date: Nov 2004
Location: Southwest Missouri
Posts: 5,348
Likes: 166
Liked 1,198 Times in 1,060 Posts
Default Re: Need advice on removal of gen rotor from PTO shaft

I thread the end of the rotor's hollow shaft with 1/8" NPT, install a grease zert. Then pressurize grease. The rotor may not loosen immediately but will come loos e in a day or so. The reaseon I do it this way is I can not bring myself to subject the rotor to possible damage by hitting it with even a rubber hammer.

Kent
Reply With Quote
  #10  
Old 12-31-2008, 01:14 PM
KidDynamo KidDynamo is offline
Subscriber
 
Join Date: Nov 2004
Location: Seattle, Washington USA
Posts: 1,783
Likes: 82
Liked 415 Times in 300 Posts
Default Re: Need advice on removal of gen rotor from PTO shaft

Quote:
Originally Posted by K D Redd View Post
I thread the end of the rotor's hollow shaft with 1/8" NPT, install a grease zert. Then pressurize grease. The rotor may not loosen immediately but will come loos e in a day or so. The reaseon I do it this way is I can not bring myself to subject the rotor to possible damage by hitting it with even a rubber hammer.

Kent

Hi- I had a much older Pincor unit that smacking, etc, would NOT free. I tried the grease gun trick and it worked. I have since used the trick on another stubborn unit. If your's has a taper fit design, it might work for you.

Check this thread out. You may notice that I was slow to hear the music.

http://www.smokstak.com/forum/showth...ghlight=pincor
Reply With Quote
  #11  
Old 01-22-2009, 06:35 PM
mbdittmar mbdittmar is offline
Registered-II
 
Join Date: Dec 2007
Location: Westminster, CO
Posts: 72
Likes: 9
Liked 72 Times in 6 Posts
Smile Re: Need advice on removal of gen rotor from PTO shaft

Finally got around to working on this again. I used the push-rod and threaded rotor shaft technique mentioned above. Rotor popped off pretty easily ! Thanks for all the great tips !!!
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
Converting A Vertical Shaft Lawnmower engine to a horizontal shaft Jordan Garden Tractors / Mowers / Scooters 18 06-16-2009 03:49 PM
How to pull rotor from mag? Steve Jags Magnetos, Ignition Coils and Spark Plugs 2 12-08-2007 02:29 PM
X Rumely Steering Shaft Removal Problem?? Gasengin Antique Tractors - Old Iron Lugs, Cleats and Tracks 3 07-07-2007 12:52 AM
onan rotor removal R VanDevere Onan Generators 2 10-24-2005 03:11 AM
Coleman Rotor Arthur Generators & Motors General Discussion 3 09-28-2004 08:33 PM


All times are GMT -4. The time now is 07:46 PM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark
A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2014 by Harry Matthews
P.O. Box 5612 - Sarasota, FL 34277