D6 9u

[Peter Kennedy]

Can anyone tell me how much and what grade of oil I will need to do an oil change in the gearbox and final drives in this old girl ??? I found traces of water in the oils and need to do this oilchange pronto !!
Thanks
Pete

 

[surfer-joe]

Use a transmission/drive train spec oil in 30wt. You might want to flush the housing with a bit of hydraulic oil and #2 diesel first, and don't forget to clean out the magnets, if they are still in place. The finals you will fill to the edge of the filler holes. The tranny will have a dip stick, or should. If it's hot most of the time you operate this Cat, you might want to consider a 40wt oil instead of the 30wt. Oh yes, check for anything that may be loose or worn enough to allow water to seep in the housings.

Good Luck!

You can buy a D6 9U service manual as follows, from your local Cat house.

Media: SEBU6555

Media Title: D6 Tractor - Operation & Maintenance Manual

Language: English

Product Family: TRACK-TYPE TRACTORS

Model Number: D6

Serial Number: 8U1-Up, 9U1-Up

Media Types: Id Type Price Weight
SEBU6555BOOK BOOK $39.00 0.545

 

[Old Magnet]

My owners manual calls for 90wt gear oil in the transmission and final drives.

For extreme heat and operating conditions the recomendation is 140wt.

 

[Peter Kennedy]

Thanks for your advise so far fellas !!. I am going to use 85/140 in both gerabox and final drives. I will use some diesel fuel to flush out the crappy oil first tho. This old girl had been bogged in a dam for a few days and took in some water before my old mate bought her. She needs some TLC to get her back to order again .
Does anyone know how much oil I will need ???

 

[Old Magnet]

42 quarts for the transmission, 13 quarts each for the finals.

 

[Nige]

I'm going to disagree here. The former recommendations of hypoid gear oil for transmission and final drives have been superceded by TO-2/TO-4 specification power train oils. Those recommendations are backward-compatible to older machines, although the paper manuals from that time will not say so.

SAE30 TO-4 speciifcation oil is the replacement for 80W/90.
SAE50 TO-4 specification oil is the replacement for 85W/140.

Believe it or not the viscosity of an 80W/90 gear oil is the approximately same as an SAE30, although at first glance you would not imagine that's the case. See the chart in this link.

http://www.liqui-moly.de/liquimoly/mediendb.nsf/gfx/7B0498A05B66E5E1C12573B000545988/$file/TI%20viscosity%20ISO%20vs%20SAE.pdf

 

[Old Magnet]

Yes, I'm aware of the current specs but it's easier for us old farts to think in terms of the old gear oil ratings. Here is a chart that is a little easier to use:

 

[RocksnRoses]

Peter, most of the major oil companies have recommendations of oil and quantities for a wide variety of machines.

In these two examples they have recommendations for a D6 9U. Just work your way down through the menus.

http://www.datateck.com.au/lube/mobil_au/default.asp

http://www.datateck.com.au/lube/valv_auMS/default.asp

RnR.