WHAT TYPE OF OIL DO I USE

[racinstuff]

"]Just wanting to know what oil to use in a GRAVELY Trans/pto/differential as they are all 1. What weight to use?

[RalphVa]

I think I changed mine and used Exxon 10w30. Believe 10w30 is what the manual recommended. The right axle seal started leaking on mine (from being disturbed when I put the steering brakes on; I expect). The seal stopped leaking after the oil change.

I used 15w50 or 0w40 Mobil 1 in the crankcase. It was using some dino oil but stopped after the 2nd change of Mobil 1.

Ralph

[racinstuff]

So if I use 10w40 that would be ok??

What about 80-90 gear oil ?

[Ford850]

Originally Posted by racinstuff

So if I use 10w40 that would be ok??

What about 80-90 gear oil ?

There's a huge difference between 10w40 and 80-90 gear oil. You should ask this question to the Gravely guys who post down in the "2-Wheel Tractor" forum under the Related Equipment area of this site. They will get you the info you need.

[ToadHill]

I'd use the slippery kind. ( I just couldn't resist)

[DieselPower]

Originally Posted by Ford850

There's a huge difference between 10w40 and 80-90 gear oil. You should ask this question to the Gravely guys who post down in the "2-Wheel Tractor" forum under the Related Equipment area of this site. They will get you the info you need.

Not familiar with how the fluid viscosity systems work are we. Actually 10W/40 and 80W/90 are very close in the viscosity range. You seem to forget that the engine oil and gear oil viscosity's are completely different systems. A 10W/40 engine oil is approximately a 75W/87.5 going by the SAE J306 Automotive Gear Viscosity Classification, where viscosity at 100ｰC min, mm2/s in cSt is used as the comparative guide.

Now with that said, do not use engine oil. They are completely differently formulated additive packages. Many of the additives you will find in a engine oil serve no purpose in a gear lubrication system and conversely you will find many additives in a gear oil that serve no purpose in a combustion engine. Use the lubricant designed and formulated for your application. Your equipment will thank you.

[racinstuff]

Thanks to everyone for your help. I have this site under my favorites so I will be asking more questions later on

[Ford850]

racinstuff,
I'm not sure if you are talking about an old Gravely or not. If it's an older model, I attached a link to a Gravely site that should help you out. You can downloand the old owners and service manuals for the tractors and attachments. You'll see they recommend you only use engine oil since it is a shared system for the engine and transmission. If it's a newer model, disregard.
OldGravelys.Net: :

[racinstuff]

Thanks for your help FORD850 I'll take a look at the site