The Forestry Forum is sponsored in part by:

Draw for handbuilt acoustic guitar get your name in


Forestry Forum
Sponsored by:


TimberKing Sawmills



Toll Free 1-800-582-0470

LogRite Tools



Norwood Industries Inc.


Sawmill & Woodlot Magazine



Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money!

STIHLDealers.com sponsored by Northeast STIHL


Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades

Turbosawmill

Sawmill Exchange

BRUTE FORCE Authorized Dealer

Woodshax Outdoor Vending Solutions

FARMA


Council Tool

Baker Products

ECHO-Bearcat



Author Topic: John Deere 440A tranny troubleshooting  (Read 684 times)

0 Members and 1 Guest are viewing this topic.

Offline lovetotinker

  • member
  • *
  • Posts: 5
  • I'm new!
    • Share Post
John Deere 440A tranny troubleshooting
« on: June 01, 2018, 08:59:02 PM »
I have a 1968 John Deere 440A cable skidder with a syncro-range tranny. Supposed to shift smoothly between high and low range. Synchronized. However it will not stay in high range. Pops out as soon as you let the clutch out. I took the top off the tranny and looked the insides over. Every thing looks about as it should. The shifting linkage seems to stay in the appropriate detentes and seems adjusted according to the manual. Would the syncro disks be the cause if they are worn?  Or would someone with more experience out there have another suggestion or advice? It does stay in low range just fine. Would be nice to have both.

Offline mike_belben

  • Senior Member x2
  • *****
  • Posts: 2756
  • Location: Middle TN
  • Pulp Friction
    • Share Post
Re: John Deere 440A tranny troubleshooting
« Reply #1 on: June 02, 2018, 10:30:20 AM »
I had a smoked synchro medium duty truck trans that would do that and worse.  If the dogs on the side of the gear and/or inside of the sliding clutch collar are mushroomed over they wont play nice and jumping out of gear is on the list of behavioral problems.   

Look and be sure that the shift fork fingers, links, yokes, pins etc all are in good shape and dont have a wear stackup that is preventing the fork from pushing the sliding clutch all the way to its home.  Also be sure there isnt a missing plastic or brass piece that takes up clearance between the fork and the groove in the sliding clutch OD. 
Revelation 3:20

Offline Satamax

  • Senior Member x2
  • *****
  • Posts: 1184
  • Location: South eastern alps, in France but right on the italian border.
  • Gender: Male
    • Share Post
Re: John Deere 440A tranny troubleshooting
« Reply #2 on: June 02, 2018, 03:11:34 PM »
I don't know zilch about JD tranies. 

But on Toyota ones, a  very usual problem, is the spring behind the locking ball, which is on the fork's shaft; wears off or breaks. 

That would the first thing i would check, if the architecture is the same. 
French CD4 sawmill. Latil TL 73. Self moving hydraulic crane. Iveco daily 4x4 lwb.

Offline mike_belben

  • Senior Member x2
  • *****
  • Posts: 2756
  • Location: Middle TN
  • Pulp Friction
    • Share Post
Re: John Deere 440A tranny troubleshooting
« Reply #3 on: June 02, 2018, 03:16:59 PM »
Yeah that is a good point too.  Detented rails may be employed in the top cover.  
Revelation 3:20

Offline lovetotinker

  • member
  • *
  • Posts: 5
  • I'm new!
    • Share Post
Re: John Deere 440A tranny troubleshooting
« Reply #4 on: June 03, 2018, 07:38:55 AM »
Thanks for the input. The detente springs and balls I did check, although the manual suggests giving the springs an actual tension test, they seemed stiff enough. I don't think they could be the problem because one shifting system works fine and the other works fine in low range. If the spring for that system where bad it wouldn't hold it in low range either. I think the problem must have to do with that syncro or as Mike_belben suggested, the shifting collar and other related parts. I will take the top off again and compare the parts diagram to what I see. 

Offline East ky logging

  • Full Member x2
  • ***
  • Posts: 122
  • Age: 46
  • Location: Magoffin co Kentucky
  • Gender: Male
    • Share Post
Re: John Deere 440A tranny troubleshooting
« Reply #5 on: June 03, 2018, 11:06:57 AM »
I have a 440 b that donít want to stay in high range it will stay in as long as youíre giving it the fuel but when you let off it will usually kick out. I never have gotten around to checking it out but I would like to get it fixed. If you figure out the problem could you post it on here so maybe Iíll know where to start looking and maybe help someone else someday.

Offline Firewoodjoe

  • Senior Member
  • ****
  • Posts: 711
  • Age: 30
  • Location: Northern lower michigan
  • Gender: Male
  • I'm new!
    • Share Post
Re: John Deere 440A tranny troubleshooting
« Reply #6 on: June 03, 2018, 05:12:49 PM »
I had one years ago. Would kick out and sound like a squealing bearing. It was the fork. Worn just enough. Had it welded and machined it worked great.

Offline lovetotinker

  • member
  • *
  • Posts: 5
  • I'm new!
    • Share Post
Re: John Deere 440A tranny troubleshooting
« Reply #7 on: June 03, 2018, 08:29:01 PM »
Thanks, I'll check out the forks when I next have it apart. Probably won't be till July, and will post what the problem was when I figure what it is....


Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

xx
440a john deere

Started by phil-tinker on Forestry and Logging

5 Replies
1313 Views
Last post November 11, 2010, 09:31:57 PM
by Bobus2003
xx
john deere 440a update

Started by duckslayingpro on Forestry and Logging

4 Replies
849 Views
Last post March 18, 2012, 10:54:52 AM
by MJD
xx
john deere 440a winch

Started by duckslayingpro on Forestry and Logging

4 Replies
1248 Views
Last post March 29, 2012, 08:52:13 PM
by arojay
question
440a john deere skidder

Started by phil-tinker on Forestry and Logging

9 Replies
5316 Views
Last post October 15, 2010, 10:37:10 PM
by Bobus2003
 


Powered by EzPortal