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Old 08-01-2013, 07:24 PM
ejkjell's Avatar
ejkjell ejkjell is offline
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Join Date: Apr 2007
Boat: Prostar 197
Location: Washington
Posts: 29
Oil-bath wheel bearings

How often does the fluid in the oil-bath wheel bearing assembly need to be flushed or replaced?

I've moved my 2004 Prostar 197 boat and trailer cross country 4 times and I haven't had any issues and the fluid has remained at a constant level since I bought it. Love this trailer!
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Old 08-01-2013, 08:30 PM
vogelm1's Avatar
vogelm1 vogelm1 is offline
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Join Date: Aug 2005
Boat: 2005 MasterCraft ProStar 197, MCX
Location: Minocqua, WI
Posts: 525
Annually would be a reasonable change interval, just in case the oil is contaminated with water. If there is a significant amount of water in the hub, the oil will become milky in color.
2005 ProStar 197 w/1:1 MCX; Acme #843; 2007 MC ZeroFlex Tower
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Old 08-01-2013, 09:44 PM
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93Prostar190 93Prostar190 is offline
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Join Date: Apr 2005
Boat: 2008 Prostar 214, MCX, Mini-Tower
Location: Central OH
Posts: 2,685
Annually ?

Yikes got to go !
Keep a tight line, and a smile on your face. Peace out.
2008 Prostar 214 MCX
Previous 93 Prostar 190 1.5:1 GT40

"Left Foot Forward and preferring girls."
"Do you have Flake on that boat?"
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Old 08-01-2013, 10:36 PM
uplander uplander is offline
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Join Date: Jan 2013
Boat: MC 2002 X30
Location: midwest
Posts: 1,237
pretty simple to drain, I have one giving me trouble so I actually drained and refilled minutes before leaving for vacation. make sure you find out the proper weight of oil to use for your hubs. mine takes straight 50W motor oil.

If using trailer considerable miles I would do annually
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Old 08-02-2013, 10:23 AM
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bturner2 bturner2 is offline
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Join Date: Mar 2008
Boat: Maristar 200VRS w/ X2 Package, 2007, 310HP
Location: Brighton, MI
Posts: 3,844
I didn't do mine for the first 5 years but I only trailer about 5 times a year. If the oil is clear (not milky) you're probably OK. Annually is probably MCOCD unless you're putting some serious miles on or you're getting water in the hubs in which case you have another problem that needs to be addressed. That being said changing it annually certainly isn't going to hurt anything either. Personally I've gone to flushing the brake fluid annually (which is probably MCOCD) and pulling apart the calipers and changing the hub oil every other season.
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