OIL for A 5U D2 Transmission

I would tend to think that it would take 90wt or 80/90 wt gear oil. Most major brands offer it. My personal choice would be Mobil Delvac 80w -90 If your in really cold country you could spend the extra money and use Mobil Delvac 75w - 90 synthetic. Up to you. I'm sure Cat offers a 80wt 90 gear oil and likely has a synthetic as well. Main thing is to get it drained out good and do a good flush with some diesel fuel prior to refilling. Clean is the name of the game!
Best,
Woody

 [attachment=70372]IMG_5198.jpeg[/attachment]Thank you. Is there a non-detergent oil made by caterpillar that is still available for the transmission ?

cat dont make any oils or grease. they are another brand packed for them. the "only use our oil cuase its the best" is marketing crap. the only time you use genuine fluids is its the only product available or for new machines to meet extended warranty requirement. most you can by off the product manufacturer cheaper the only difference is the drum and the label. cat doesnt have much in its lube range that suits these old girls anymore they are more for the 70s and later machines. the older full manual drivelines started phasing out then. todays machines are all some for of hydrostatic drive.

these old girls have very simple requirements. according to a lube engineer at penrite older engines still benefit from modern oil technology even though its superior to what they need.
just dont use zinc fortified oils in the trans and gear housings as they hove bronze components which dont like the zinc additives.

i personally prefer penrite but currently we're using caltex as that was available at the time for a good price and is a quality product. the most important thing is it meets the requirements and its kept at the right level and changed regularly.

[quote="trainzkid88 post=244361 userid=11838"]just dont use zinc fortified oils in the trans and gear housings as they hove bronze components which dont like the zinc additives.

 [/quote]
What components are brass in the trans and gear housings? Bearing cages?
ExxonMobil make oil for Cat.
Your comment about the oils from the manufacturer is mostly correct but there has been instances where the aftermarket oils are not the same as the genuine article and a very noticeable difference in equipment performance and lifespan have occurred.
Cat still offers oils that are suitable for older machines. Don't know where your info comes from.
I personally use Castrol oils.

[quote="trainzkid88 post=244361 userid=11838"]just dont use zinc fortified oils in the trans and gear housings as they hove bronze components which dont like the zinc additives.

 [/quote]
What components are brass in the trans and gear housings? Bearing cages?
ExxonMobil make oil for Cat.
Your comment about the oils from the manufacturer is mostly correct but there has been instances where the aftermarket oils are not the same as the genuine article and a very noticeable difference in equipment performance and lifespan have occurred.
Cat still offers oils that are suitable for older machines. Don't know where your info comes from.
I personally use Castrol oils.

i was told that by a lube specialist from caltex that there where bronze components in the driveline that didnt like the zinc additives used in some oils. brass is copper and zinc. bronze is copper and tin often fortified with phosphorous or aluminium hence phosphor bronze. ally bronze can be so tough you cant machine it and it has to be forged or cast. alot of ship propellors are ally bronze for its toughness and wear resistance. zinc is galvanically different to tin and thus bronze so it can react.

yes cat did originally develop thier own oils with standard oil that where the DELO product line comes from.