The front axle has three bevel gears. Why would I choise Hypoid gear lube?

[CalG]

With only bevel gears in the front axle differential and drives out to the wheel axle, I see no reason to use the stinky sulfur rich hypoid gear lube.

"Change My Mind" ;-)

 

[RickB]

Use whatever you choose.

 

[Patches]

I've used Mobil 1 75/90 gear lube since new. Like the idea of having the extreme pressure additives in the front axle. Lots of pressure on those gears and bearings at times

 

[def38]

Use the manufacturer's recommended gear lube. Some gear systems may contain non-ferrous metals. This likely requires GL-4 gear oil. If there are no non-ferrous metals, GL-5 with the EP additives is the correct choice. The so-called "stinky" gear lubes with EP additives tolerate much higher loads without shearing. You won't smell them once they are installed in the gearcase. I add some MOS2 to my gearcases which further reduces friction. I also use Molybdenum Disulfide fortified NLGI II greases on my machinery. The EP aditive "Moly" is found fin engine oils, greases and other lubricants. It is also used in gun lubricants. The stuff is very slippery and promotes a considerable reduction in friction and tolerates high heat. It reduces gear wear under high load conditions.

Is your mind changed?

 

[ruffdog]

Just plain bevel gears don't need the lube made for hypoid gear designs. A hypoid gear set is helical and off-set with a small contact patch so there is more rubbing going on than the straight gears. That is why it needs a high pressure lube. I have used hypoid lube in bevel gear boxes though.

 

[ruffdog]

The extra EP additives in the GL-5 may react to the soft yellow metals like syncros in a transmission so they would recommend the GL-4 lube that has about half the EP additives:

Guidelines for Using Gear Oil in Specific Applications

 

[Fallon]

Kubota fills their front axles with hydraulic oil (UDT or SUDT2, I forget). But they spec hydraulic oil or gear oil for the axle. The thinner stuff will rob less HP by amounts you couldn't tell by operating the machine. But the thinner stuff also leaks out of seals easier.

I just put thicker gear oil in mine. Stopped or slowed the leaky seal on one of the front steering joints. Need to take it into Kubota before the warranty is up in December to get the seal properly fixed. But thick gear oil is fine for now during my busy season.

 

[5030]

With only bevel gears in the front axle differential and drives out to the wheel axle, I see no reason to use the stinky sulfur rich hypoid gear lube.

"Change My Mind" ;-)

Guess you forgot about the center section with it's differential.