This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Allis Chalmers > Farm Equipment
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


7040 power shift creeping in neutral
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
BfChris View Drop Down
Bronze Level
Bronze Level
Avatar

Joined: 08 Apr 2020
Location: WIllinois
Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BfChris Quote  Post ReplyReply Direct Link To This Post Topic: 7040 power shift creeping in neutral
    Posted: 08 Apr 2020 at 7:55pm
I have a 7040 power shift that when shifter is high/low range and “gear” shifter is in neutral the tractor will creep forward. If you take it out of range to neutral or park it will stop but then you cannot return it to high or low without shutting tractor off. (Just grinds gears) Have tried adjusting inching but no change. Anyone have any idea what maybe going on.
Back to Top
Sponsored Links


Back to Top
MACK View Drop Down
Orange Level
Orange Level


Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 08 Apr 2020 at 9:06pm
Snap ring has come off of spool in valve body or some plates are warped in some clutches.      MACK
Back to Top
Lynn Marshall View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 13 Sep 2009
Location: Dana, Iowa
Points: 2380 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lynn Marshall Quote  Post ReplyReply Direct Link To This Post Posted: 08 Apr 2020 at 9:15pm
I agree with Mack, snap ring gone in the valve body. It's incredibly small but important. And welcome to the forum.
Back to Top
BfChris View Drop Down
Bronze Level
Bronze Level
Avatar

Joined: 08 Apr 2020
Location: WIllinois
Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BfChris Quote  Post ReplyReply Direct Link To This Post Posted: 08 Apr 2020 at 9:27pm
Ok will investigate that. Thank you
Back to Top
BfChris View Drop Down
Bronze Level
Bronze Level
Avatar

Joined: 08 Apr 2020
Location: WIllinois
Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BfChris Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2020 at 7:33pm
Are you speaking of the spool on the modulator valve or inching valve?
Back to Top
DrAllis View Drop Down
Orange Level Access
Orange Level Access


Joined: 12 Sep 2009
Points: 21841 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2020 at 7:34pm
Inching valve. Have to remove right fuel tank and pull the valve and disassemble to check and/or repair.
Back to Top
Unit3 View Drop Down
Orange Level
Orange Level
Avatar

Joined: 17 Oct 2009
Location: NC Iowa
Points: 5595 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Unit3 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2020 at 10:42pm
Try shifting to reverse before running the range lever.
2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C
Back to Top
DrAllis View Drop Down
Orange Level Access
Orange Level Access


Joined: 12 Sep 2009
Points: 21841 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2020 at 6:36am
The official way to diagnose whether it's the snap ring (or not) would be to check brake pressure in the tranny. Some of us old guys can just tell what it is without ever connecting a gauge...….
Back to Top
BfChris View Drop Down
Bronze Level
Bronze Level
Avatar

Joined: 08 Apr 2020
Location: WIllinois
Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BfChris Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2020 at 6:49am
Ok so I would have to disassemble the whole valve to get to the snap ring correct? I can not remove just the plunger to get to it. Dr Allis, if it’s not the snap ring what else would you suspect?
Back to Top
DrAllis View Drop Down
Orange Level Access
Orange Level Access


Joined: 12 Sep 2009
Points: 21841 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2020 at 7:13am
Power Shift valve has to be removed and disassembled to replace the possible broken/missing snap ring. The inching plunger has to come out, but it is held in place by a retaining pin, so the valve has to be torn down to service it. If you have owned this tractor and all was well until one day this started happening, I'd say odds are pretty good the snap ring area is your problem. If it isn't, then I'm thinking warped plates/discs like Mack and Lynn have suggested.

Edited by DrAllis - 13 Apr 2020 at 7:15am
Back to Top
BfChris View Drop Down
Bronze Level
Bronze Level
Avatar

Joined: 08 Apr 2020
Location: WIllinois
Points: 11 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BfChris Quote  Post ReplyReply Direct Link To This Post Posted: 13 Apr 2020 at 8:29am
Yes we’ve owned it for some time and this problem developed last spring. Will look to address after planting. Thank you all for the valuable info.
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.074 seconds.


Help Support the
Unofficial Allis Forum