1999-4788 330 HP Cummins -Gear Oil Question-gctid828438

[sockeye]

Doing fall maintenance.Thought i would change transmission oil

What do you use ??? Stuff that's in there is RED so I assume ATF

Dextron 3 transmission oil .My Neighbor two boats down (490 Meridian 370 Cummins

has 30 weight oil same as his engine .Can't find a manual for the gear

so thought i would check here first

[canoel]

Before giving any recommendations I would want to know exactly what gears you have.

Unless someone has changed them, you should have the Hurth HSW800/ZF80 which takes ATF. Once you confirm which gears you have there is a lot of information on here, and via google.

[Norton_Rider]

It's probably ATF. This page from Harbor Marine has a transmission FAQ, as well as links to the maintenance manuals for various transmissions:

https://www.harbormarine.net/transmission-service#faq

[higgins_jr]

Ron, there should be a label on the transmission with brand/model/serial number and it will also have oil type as well. My HSW800 is ATF and Dexron 3 is upwards compatible from the Type 2 if I remember listed in the manual. I researched that when I changed mine.

I have seen labels on friends smaller Meridian/Searays that were SAE30 (still Cummins 330 engines), but I'd be really surprised if your neighbour's 47 with the same 800 transmissions as ours had Sae30 on their labels.

Cheers

[sockeye]

thanks for respones

Will check in the morning when i change tranny oil.

I am quite sure its ATF -Dextron3 that's in there.

We haven't changed gear oil since we got boat four years ago.

At that time mechanic in Seattle did the trannies

I don't expect the Meridian to be same tranny ,just noted

that's what he uses,

[smitty477]

The Meridian 490 should be the same trans - it is the same boat with a Meridian decal on it.

It should also take ATF fluid as well.

Maybe I can attach the Hurth page that describes the trans tags....


Attached files

[redskyjoe]

In previous boat I had a ZF W350 attached to a KTA 19 Cummins. That gearbox would take either straight 30 wt or 15-40 motor oil. I stuck with the 30 wt just cuz I thought it was weird to put a multi grade in there.

[sockeye]

John and others

Thanks for input

did the change today

It is HurthHSW800 as expected .All is well

[canoel]

Glad to hear all is well.