Allis Chalmer HD 7G

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

   I have a HD 7G track loader that has no 1st forward gear.  Everything else seems to work fine.  Is there some way to test that the clutch packs are getting pressure to engage?  Is this a common problem? Should I be looking for something right away to save time and make this repair efficient?

	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

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
delmer Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 28 Aug 2013 Location: United States Points: 2	Post Options Post Reply Quote delmer Report Post Thanks(0) Quote Reply Topic: Allis Chalmer HD 7G Posted: 28 Aug 2013 at 1:38pm
	I have a HD 7G track loader that has no 1st forward gear. Everything else seems to work fine. Is there some way to test that the clutch packs are getting pressure to engage? Is this a common problem? Should I be looking for something right away to save time and make this repair efficient?

Sponsored Links

doctorcorey Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 17 Jul 2011 Location: S. KC Missouri Points: 589	Post Options Post Reply Quote doctorcorey Report Post Thanks(0) Quote Reply Posted: 28 Aug 2013 at 7:00pm
	There are pressure taps on two transmission shaft bearing housings on the front of the transmission. Tapping into these will tell you the apply or lube pressure being exerted to each of the four clutch packs. Are your transmission pressure gauges on the dash working? You really need a service manual to properly diagnose this if you don't know the location of the pressure measuring points. I might look in mine and see if I could describe the location when I get home.

DMiller Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 14 Sep 2009 Location: Hermann, Mo Points: 33520	Post Options Post Reply Quote DMiller Report Post Thanks(0) Quote Reply Posted: 28 Aug 2013 at 9:23pm
	On my own 7G I have lost low reverse, will come and go at times so I suspect seals. I have also a weak high forward, low forward being reasonable which I also attribute to seals as it will connect better at times. I agree with Corey, there are two caps on the lines to the lower shaft support cover, these are the ports of the directed oil for shift on it, the same is true to the upper shaft but these are just pipe plugs. There are three seals in the housings to direct oil to specific sections of the drilled shafts, either these or the clutch pack piston seals are bad in mine as lube and trans clutch pressures are good just not maintained at those points.