4.5hp mtd snowthrower won`t rev up

Reply

  #1  
Old 12-26-08, 09:44 AM
L
Member
Thread Starter
Join Date: Dec 2008
Posts: 4
Received 0 Votes on 0 Posts
4.5hp mtd snowthrower won`t rev up

The throttle is free and opens and closes with the spring returning it to wide open throttle. Starts up and won`t rev up when pushed into snow. I tied a wire to the throttle and then it revs up and throws snow. What controls the throttle and how does it know when there is a load on it?
 
Sponsored Links
  #2  
Old 12-26-08, 10:19 AM
L
Member
Thread Starter
Join Date: Dec 2008
Posts: 4
Received 0 Votes on 0 Posts
I read the thread on 12-23-08. Very interesting read on the link given. Mine is a 2 cycle and the fact that the throttle closes on start up seems to indicate the weights are doing there thing. They just don`t let the throttle open back up.
 
  #3  
Old 12-26-08, 10:37 AM
A
Member
Join Date: Feb 2008
Location: usa
Posts: 755
Received 0 Votes on 0 Posts
Post the model number, etc. for both the engine and thrower.
 
  #4  
Old 12-26-08, 10:52 AM
L
Member
Thread Starter
Join Date: Dec 2008
Posts: 4
Received 0 Votes on 0 Posts
engine mdl# HSK8488222c MTD MDL. SERIES 140-152 snowthrower
 
  #5  
Old 12-26-08, 11:43 AM
A
Member
Join Date: Feb 2008
Location: usa
Posts: 755
Received 0 Votes on 0 Posts
Your engine numbers are off. I think your engine is a HSK845 Spec. No. 8223C.

Download the manual linked below and verify governor spring and linkage is connected per manual. I suspect the problem is in the spring or linkage or possibly governor arm has slipped, which I doubt.

http://www.smallenginesuppliers.com/...nformation.pdf
 
  #6  
Old 12-26-08, 12:02 PM
L
Member
Thread Starter
Join Date: Dec 2008
Posts: 4
Received 0 Votes on 0 Posts
This looks like what I`ve got. Thanks. I have to go to work now. Will try to sort it out this week end. As mentioned everything is free and throttle is wide open until it starts. Then it idles (seems to be a fast idle) and it makes no attempt to rev up. It`s very interesting to me and I`d like to understand how it senses to speed up when it works properly.
 
Reply
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description: