Transmission Fluid VT555 Cummins

[olivierveyractrawlerforum]

Hi There, I have a small leak in the transmission of a 1989 Cummins 555VT. What transmission fluid should I use?

 

[Rusty Scupper]

Hi, Without knowing what transmission you have I can only guess. With a Cummins
triple nickel I'm guessing a twin disc. If memory serves I think they call for a Dexron fluid.
My Velvet Drive trans can run Dexron or 30wt. engine oil .
Hopefully others will chime in with more info.
P.S. get the leak fixed.

 

[Nickwadsley]

My triple nickels are paired with twin disc's 506s
30w or 40w dependent on temp
I run 30w rotella

 

[olivierveyractrawlerforum]

Hi, Without knowing what transmission you have I can only guess. With a Cummins
triple nickel I'm guessing a twin disc. If memory serves I think they call for a Dexron fluid.
My Velvet Drive trans can run Dexron or 30wt. engine oil .
Hopefully others will chime in with more info.
P.S. get the leak fixed.

Thank you, yes on getting the leak fixed but mechanics are slow and backed up in my neck of the woods. I will check the transmission model next time I am on the boat and post more details.

 

[olivierveyractrawlerforum]

thank you. Ill check the model next time I am on the boat.

 

[twistedtree]

The only way to know for sure is to confirm the make and model of the gear box. It's also quite common for the required oil type and weight to be right on the data tag on the gear, so check it carefully. Your answer is probably right there hiding in plain sight.

 

[olivierveyractrawlerforum]

Thank you. I did not see this info on the gear, but I'll check again.

 

[C lectric]

The T.D. gears require 20 wgt. or 30 wgt or 40 wgt depending upon the temperature of the water temp it is operating in and the gears operating temp.

DO NOT USE DEXRON or any ATF. That is my understanding.

Yes, the info should be on the data plate but you can also phone or email them.

I have the V555M which came with the TD. 506. I have used the 30 wgt oil for many years now and the tests come back , no problems,

 

[olivierveyractrawlerforum]

You are right: it is a 506 - I'll go with your recommendation (ie: 30 Wgt - I am in Northern California with mild winders and cold (but not freezing) waters) - any specific brand you recommend?

 

[olivierveyractrawlerforum]

Thank you all, I established that it is a 506 transmission so I'll use 30 Wgt.

 

[Crusty Chief]

Non-detergent oil also.

 

[Nickwadsley]

Rotella t4 30w