murray drive belt problems

Reply

  #1  
Old 07-06-08, 01:33 PM
Member
Thread Starter
Join Date: Jul 2008
Posts: 5
Question murray drive belt problems

greeting from newbe . murray model# 4005002x8A 12.5 b&s. i have replaced the drive belt #37x87ma and drive pulley, but the belt keeps coming off. ihave the mower belly off and was under the unit watching the belt. i noticed that the drive pulley moves up and down on the trans axle shaft when changing gears and reving motor is this normal? also the belt guides are in place and the belt is on correct. the idler pulley is on and working. when in neutral the belt has a lot of slack it flops around hitting the underbody. please help my grass is goin wild.
 
Sponsored Links
  #2  
Old 07-06-08, 04:20 PM
Member
Join Date: Nov 2007
Posts: 128
Look closely at the frame near where the trans is bolted on,
Murray had a serious problem in this area in it's latter years.

The frame is l8ikely cracked and broken.
 
  #3  
Old 07-07-08, 08:47 PM
Member
Thread Starter
Join Date: Jul 2008
Posts: 5
checked mount and frame all ok. i can watch the pulley travel up and down on the shaft. the woodruff key is in place. you can pull up on pulley with your hands.thanks fisher
 
  #4  
Old 07-07-08, 08:50 PM
Member
Thread Starter
Join Date: Jul 2008
Posts: 5
Question

o yeah the E clip is also in place..
 
  #5  
Old 07-08-08, 10:05 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,814
It's normal if it's a small amount. How much movement is it? Is it the pulley moving on the shaft, or the shaft moving in the tranny? Both?
 
  #6  
Old 07-10-08, 06:11 PM
Member
Thread Starter
Join Date: Jul 2008
Posts: 5
hey guys i took the drive pulley off and noticed on the shaft there are two places for e-clips to go. so i put a clip below pulley and put the pulley on with the key then put on the upper clip and everything lines up perfect. ive ran it for several hours since and no belt problems. the book only shows 1 clip that goes on top of pulley? hope this helps some else. thanks for all ya"lls help. p.s. cheese the slack is no longer a problem thanks............
 
  #7  
Old 07-10-08, 09:05 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,814
Good to hear. Just so you know, I believe there should be a thrust washer between that clip and the top of the transaxle housing. That way the clip doesn't wear into the top of the housing or wear the clip thin and cause it to come off. That may be why the clip was gone in the first place.
 
  #8  
Old 07-13-08, 11:46 AM
Member
Thread Starter
Join Date: Jul 2008
Posts: 5
what part # would it be? i cant find any on the parts list.does it act like a shim?or can i fabracate a piece of pipe.to go over shaft? will it rub the bottom of the trans? thanks cheese
 
  #9  
Old 07-13-08, 03:58 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,814
Just use a thin flat washer that fits over the shaft snugly. It's probably not very important anyway, since the shaft pressure is upward, not downward, when the unit is in use. I wasn't thinking of that when I mentioned it before. The thrust washer(s) is on the same shaft but inside of the case, not the top.
 
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
Display Modes