Farm Equipment - 7040 heating up differential oil

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7040 heating up differential oil

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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=109154
Printed Date: 11 Sep 2025 at 10:47pm
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Topic: 7040 heating up differential oil

Posted By: TedinOK
Subject: 7040 heating up differential oil
Date Posted: 18 Jul 2015 at 6:52pm

Need some ideas as to why my 7040 heats up the rear end/final drive oil when I run the PTO brush-hogging?

Replies:

Posted By: Lars(wi)
Date Posted: 18 Jul 2015 at 7:00pm

Do you have the proper oil in there? and at the proper level?

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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.

Posted By: TedinOK
Date Posted: 18 Jul 2015 at 7:04pm

Been using the oil from the Ag store that says is a replacement. Could the filters restrict proper flow if they need changing ? If I stop and let idle at approx. 1000 RPM for 10 minutes it will apear to cool down some.

Posted By: Orange Blood
Date Posted: 18 Jul 2015 at 8:10pm

Define heating up? How hot is it? How do you know this? Did you measure it?

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Still in use:
HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060
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Posted By: TedinOK
Date Posted: 18 Jul 2015 at 8:37pm

Hot enough final drive starts to slip. Hot enough you cannot slip the clutch without pulling the ftont wheels off the ground. Hot enough to make touching steering colum a risky business. Now you tell me how hot is that.

Posted By: DougS
Date Posted: 18 Jul 2015 at 8:44pm

It's probably hot from excessive slippage in the first place. I would get another opinion about the oil. If the friction modifiers in the oil are wrong there will be excessive slippage.

Posted By: MACK
Date Posted: 18 Jul 2015 at 10:05pm

How does the final drives slip?

Clutch is different oil from rear end. If it is a PD, it may be over full on oil.

Hydraulic will run 100 degrees over what the temp. is out side. 100 to 110 degrees is as hot as the human hand can stand. MACK

Posted By: DrAllis
Date Posted: 19 Jul 2015 at 8:44am

Oil for your clutch is the dipstick inside of the cab, and is not related to the hydraulic system or PTO. You don't say which transmission, but I'd guess it is the 20-speed Power Director with the gearshift on the floor, and the two-speed high/low buttons on the floor. Provided the oil level for the clutch/transmission is correct, it sounds like the piston seals inside the clutch are old and hard and leaking internally when the oil gets up to normal operating temps. Your perception of "hot" and normal operating temps aren't the same. There is an oil temp light on the dashboard for the hydraulic system/PTO compartment, so assuming it works ?? Normal Summer day working temps for any oil on that tractor is too hot to hold your hand on, including the steering column.