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View Full Version : What Oil for Oil Bath Bearings???


The Youngster
04-01-2013, 10:06 AM
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
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/showthread.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/running_gear_manual.pdf

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

GoneBoatN
04-03-2013, 08:52 PM
...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
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
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.

93Prostar190
04-05-2013, 01:30 PM
Page 14 of this .....
http://www.mastercraft.com/files/manuals/2008%20Trailer%20Manual.pdf

CantRepeat
04-05-2013, 02:08 PM
Page 14 of this .....
http://www.mastercraft.com/files/manuals/2008%20Trailer%20Manual.pdf

That's a nice little update right there.

GoneBoatN
04-05-2013, 02:31 PM
As an side note, my local MC service shop said they replace with Quicksilver gear lube used in Mercrusier I/O's. They said they do this because it is designed to still provide protection in the event of water intrusion.

http://www.walmart.com/ip/Quicksilver-High-Performance-Gear-Lube-Quart/16565456
"This 90W gear lube features improved emulsifiers to help protect gears should water enter the gear housing and tackifiers to improve oil film adhesion to gears and internal components. Quicksilver High Performance Gear Lube includes extra proprietary additives to protect from metal-to-metal contact and excessive wear."

I've not had a problem with water intrusion so I still just use the recommended by Reliable. I seem to remember other posts where people switched to 50w and their hubs ran cooler.

MattsCraft
04-05-2013, 02:39 PM
Good luck finding 50W gear oil, most auto parts carry 75W & 90W, I found a Lucas product called "Hub Oil", shows a picture of an 18 wheeler on the bottle, does not state the weight, I had NAPA look it up and it is 60W, closest I could find. I was running 90W, but found it to run Hot especially during the 90+ degree summer days with a fair amount of breaking, I think the lower weight runs cooler.

CantRepeat
04-05-2013, 05:09 PM
Good luck finding 50W gear oil, most auto parts carry 75W & 90W, I found a Lucas product called "Hub Oil", shows a picture of an 18 wheeler on the bottle, does not state the weight, I had NAPA look it up and it is 60W, closest I could find. I was running 90W, but found it to run Hot especially during the 90+ degree summer days with a fair amount of breaking, I think the lower weight runs cooler.


I believe it was 50w motor oil that was suggest in most documentation.

Do you have a part number for that hub oil product?

rspiecha
04-05-2013, 06:06 PM
My documentation says 50wt motor for 2005 trailer.

bturner2
04-06-2013, 06:56 AM
I found Royal Purple 50 here for $9 a quart plus shipping.....

http://paceperformance.com/i-5154677-rpm01050-royal-purple-sae-50-straight-weight-synthetic-motor-oil-1-quart-container.html

So the next question would be is how much do I need for 2 axle sets (4 hubs)? I'm going on my seventh season with original tires, hub oil and brake fluid. On the list for maintenance this spring once the boat is on the ShoreStation is new tires, bearing oil, brake fluid flush and caliper clean up / lube.

bturner2
04-06-2013, 07:05 AM
Also found UFP oil on the Pacific Trailer site.....

http://www.pacifictrailers.com/trailer-buddy-hub-oil-by-UFP/

So which do we think is going to be better. Royal Purple makes some good stuff and it's full synthetic, I'm confident UFP knows what they're doing and it's purpose blended. Oh decisions, decisions.........

GoneBoatN
04-06-2013, 09:59 AM
I found Royal Purple 50 here for $9 a quart plus shipping.....

http://paceperformance.com/i-5154677-rpm01050-royal-purple-sae-50-straight-weight-synthetic-motor-oil-1-quart-container.html

So the next question would be is how much do I need for 2 axle sets (4 hubs)? I'm going on my seventh season with original tires, hub oil and brake fluid. On the list for maintenance this spring once the boat is on the ShoreStation is new tires, bearing oil, brake fluid flush and caliper clean up / lube.

I changed mine this winter. The one quart bottle I purchased has 14 oz left. I know I wasted a couple of oz because I overfilled then removed a little.

steve_amestoy
04-13-2013, 10:57 PM
Napa has valvoline 50wt racing oil for around $6 a quart. As far as draining your oil out, just unthread the reliable cap and let it drain out. Thread cap back on tight and refill at allen plug. I just refreshed all 4 today with fresh oil.