front differential fluid question

[RexB]

Dumb question i searched for: This CK30 being a 4WD, so can I use Limited Slip gear oil (80/90W) like in my trucks, though it is a different gearing material setup?

the shop manual specs 80/90W but no mention of LS additive and i've got an extra gallon of API/GL5 LS

 

[dfkrug]

Dumb question i searched for: This CK30 being a 4WD, so can I use Limited Slip gear oil (80/90W) like in my trucks, though it is a different gearing material setup?

the shop manual specs 80/90W but no mention of LS additive and i've got an extra gallon of API/GL5 LS

My CK30 specs gear oil, but came new with hyd oil of some unknown type and
brand. My Kubota specs UDT OR gear oil. Quite a difference there. I prefer
gear oil for diff gears, and I think that 80 or 90 weight gear oil with LS
additives would be OK. Doesn't the container say it is OK to use with
conventional diffs?

 

[Soundguy]

If I bought a machine and it came with plain hyd oil in a gear sump.. I'd never let the driver leave who unloaded it.. it would go right back...

UTF or gear oil would be different.. but 'jack oil'.. no thanks...

Soundguy

 

[RexB]

My CK30 specs gear oil, but came new with hyd oil of some unknown type and brand. My Kubota specs UDT OR gear oil. Quite a difference there. I prefer gear oil for diff gears, and I think that 80 or 90 weight gear oil with LS additives would be OK. Doesn't the container say it is OK to use with conventional diffs?

The gear oil container big or fine print both doesn't mention conventional differentials, it says "Limited Slip API/GL-5 Plus Gear Oil SAE 80W90. For complete fill or topping off of: manual transmissions, hypoid type differentials, limited-slip/twin grip/trac-lok/sure-grip differentials. Performance equivalent to Ford M2C197A, Chrysler MS9020, Mack GO-H, G, & F.

A hypoid gear is a type of spiral bevel gear like in this front end, so this gear oil ought to be Ok in this front axle when both wheels are pulling.

As far as conventional differentials go, a manufacturer (Red Line) claims its "75W90 Gear Oil provides excellent protection in nearly all differentials, conventional and limited slip" so I agree with you that a LS additive ought to be allright to use in either.

Web pundits have it both ways - some say don't use LS in conventional diffs, some say it doesn't matter. This tractor shop manual doesn't say one way or another.

 

[DieselPower]

Yes, the gear oil that is limited slip compatible will be fine for conventional gear sets. The additional additives are friction modifiers used for the clutch disc in limited slip differential's.

 

[RexB]

Thanks for the answers, the new 80W90 LS gear oil is in and drove it in 4WD figure-eights yesterday to work the oil around the gears and listen for any chatter/binding. (The wife drove it while i walked by the front axles.) Then took off the fill plugs to see if there was any foaming. The new 80W90 LS works fine so far.

Back to the woods work. But first I gotta' get the wife off the tractor!

 

[Brimstone10x]

anymore it seams that gearboxs in cars trucks and tractors are calling for thiner oils . in deeres mfwds that used to call for 80w90 now call for hygard . I think in all but the most extrem cases the thiner oils are just fine and may be beater at cool temps.