HD7G loses lube pressure after 15 mins

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

   I've got an HD7G that loses transmission lube pressure after running for about 15 mins.  
I can kill the engine for approx 1 minute, and it will run for another 15.

It was worse, and would run 5 sit 5 before I went through all three screens and 3 trans filters, oil change.  Haven't noticed anything large in any of the screens and filter (bearing material ect)

Been in contact with "Dmiller" on here, and hes helped me locate alot of hard to reach and see places.  Super helpful. 

Using AW32 oil in place of the 10W. 

No visible leaks.

I'm a chemical operator by trade, all my intuition tells me the fluid is getting kind of vapor locked, because as soon as I kill the engine....it all runs back to the sump in short order and runs fine.  Not a warm up /viscosity problem.  Feels more like a floating restriction, or a check valve somewhere is stuck open or closed.

I searched the forum and a guy named DoctorCorey had an identical issue, but never replied on the thread about how he resolved it, I did see he sold his HD7G "ready to work" but he hasnt been active here for a couple years.

	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
turboturtles Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 26 Mar 2020 Location: Kentucky Points: 3	Post Options Post Reply Quote turboturtles Report Post Thanks(0) Quote Reply Topic: HD7G loses lube pressure after 15 mins Posted: 03 Apr 2020 at 7:49am
	I've got an HD7G that loses transmission lube pressure after running for about 15 mins. I can kill the engine for approx 1 minute, and it will run for another 15. It was worse, and would run 5 sit 5 before I went through all three screens and 3 trans filters, oil change. Haven't noticed anything large in any of the screens and filter (bearing material ect) Been in contact with "Dmiller" on here, and hes helped me locate alot of hard to reach and see places. Super helpful. Using AW32 oil in place of the 10W. No visible leaks. I'm a chemical operator by trade, all my intuition tells me the fluid is getting kind of vapor locked, because as soon as I kill the engine....it all runs back to the sump in short order and runs fine. Not a warm up /viscosity problem. Feels more like a floating restriction, or a check valve somewhere is stuck open or closed. I searched the forum and a guy named DoctorCorey had an identical issue, but never replied on the thread about how he resolved it, I did see he sold his HD7G "ready to work" but he hasnt been active here for a couple years.

Sponsored Links

gemdozer Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 17 Sep 2009 Points: 941	Post Options Post Reply Quote gemdozer Report Post Thanks(0) Quote Reply Posted: 03 Apr 2020 at 9:38am
	You could try ATF oil or 10 standar oil no detergent