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-   -   What Oil for Oil Bath Bearings??? (http://www.mastercraft.com/teamtalk/showthread.php?t=53334)

The Youngster 04-01-2013 10:06 AM

What Oil for Oil Bath Bearings???
 
I have an '03 MC trailer and want to make sure I purchased the correct oil for replacement in the oil bath (80W-90 gear lube). Also, any pointers on removing the old oil and replacing would be great as well.

Thanks - Clayton

JRW160 04-01-2013 10:54 AM

I think I used 75W-90 when I replaced mine. That 80W-90 should be fine. On my 2003 trailer, there was one screw on the hub. I removed it then turned the assembly so the opening left by the screw was facing down and drained it. It takes a long time to drain.

Refill it kinda slow because it takes a little time for the oil to make it to the front where the viewglass is. I refilled mine to the same level they were at previously. Probably about 3/4 full.

g-Dog 04-01-2013 11:47 AM

1 Attachment(s)
I'm not sure if your hubs are different than the GOLD Hubs on my 2002 205V trailer...but mine recommends to "Add oil until all of the air is forced out and no air bubbles can be seen. Hub cavity is completely filled with oil (50wt). There is no void, which would allow water entry during submersion of trailer in water and cooling of oil."

JRW160 04-01-2013 12:10 PM

2002 used UFP hubs. They are supposed to be full. 2003 should have reliable hubs. I think the consensus on there is they should be 1/2 to 3/4 full. This thread has some info.
http://www.mastercraft.com/teamtalk/...ad.php?t=22711

CantRepeat 04-03-2013 03:46 PM

You can unscrew the outer cap or the allen plug on the hub to drain.

If you have reliable oil bath hubs.


Bearing Lubrication – Oil

Below is a listing of approved lubrication
for all Reliable hubs and drums using oil
for lubrication:
(Only to be used when unit is equipped
with the Oil Bath Lubrication System)

Lubrication Specifications
Oil
Approved Sources
Valvoline Gear Oil 80W-90
SAE 90 Hypoid Gear Oil

Exxon Gear Oil 80W-90

http://www.reliablepmw.com/downloads...ear_manual.pdf

There was also a change in the reliable documentation to fill the hubs completely full.

GoneBoatN 04-03-2013 08:52 PM

Quote:

Originally Posted by CantRepeat (Post 921735)
...There was also a change in the reliable documentation to fill the hubs completely full.

Do you have a reference to where they changed that? All the documentation from Reliable that I've seen including the one you posted says to the top of the reliable logo which is about 1/3 to 3/4 full.

CantRepeat 04-04-2013 02:20 PM

Quote:

Originally Posted by GoneBoatN (Post 921832)
Do you have a reference to where they changed that? All the documentation from Reliable that I've seen including the one you posted says to the top of the reliable logo which is about 1/3 to 3/4 full.

It's been a while, like 2 years since I read it but I'll look around. I found it when I was replacing my broken plastic caps with the metal caps. It might have been an MC tech bulletin(just look and it's not an MC TB). I think it had to do with condensation or water build up in them while half full.

I'm going on 2 years without issue with them full of 90wt.

jigster 04-05-2013 11:39 AM

Mine are full. No problems. Change annually with lucas oil bath bearing oil (has a semi picture on it) available at my local napa. As stated above, drain and fill process is slow if all you have is the allen screw like mine.

-jason

93Prostar190 04-05-2013 01:19 PM

Our 2008 (different year than OP) manual states 50w oil .....

CantRepeat 04-05-2013 01:28 PM

Quote:

Originally Posted by 93Prostar190 (Post 922329)
Our 2008 (different year than OP) manual states 50w oil .....

My 06 MC trailer manual doesn't have anything on hub oil. All it has is stuff like bolt pattern and other safety checks.


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