THE ORIGINAL
OIL BATH-BASED
HUB LUBRICATION SYSTEM

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Frequently Asked Questions

Feel free to call us with questions at 1-800-561-9917

Q. What is the Liqua-Lube System?

A. The Liqua-Lube System converts an existing greased hub to an oil bath method of lubrication. It is designed for the 1.980 hub opening, commonly referred to as the 2” hub. In addition we now fit the 3000lbs 6 bolt hub!


Q. How do you seal the hub?

A. The sealing on the back of the hub is so important to the system being leak free. There is a stainless steel sleeve that is sealed onto the spindle where the seal rides with gasket sealer included in the kits. The sealant seals up any imperfections on the existing spindle and the sleeve gives a hard surface for the very aggressive oil seal. The oil seal must be closely matched to the sleeve and the inside of the hub. What works for grease may not be snug enough for liquid. On the front, there is an o-ring that is moldable and will take up any imperfections on the inside of the hub.


Q. Is this just like the semi’s use?

A. Yes, the trucking industry has been using the oil bath system for 25 to 30 years. The idea has been adapted to the smaller hub size and totally enclosed for backing into the water.


Q. What is the lubricant?

A. The lubricant is a synthetic glycol base lubricant. With the concern over clean air and water, it was determined to use an environmentally friendly lubricant rather than a petroleum base product. The lubricant will biodegrade, which means it will also absorb water. Any condensation inside the hub will mix with the liquid and keep the moisture off the bearings.


Q. Once the system is installed, do I need to do anything?

A. As with any hub, it will need to be checked, but with the Liquid-Lube System, a visual check of the lubricant level is very easy. If the lubricant level has not changed, its O.K.


Q. Where do I check the level?

A. On the marine cap, the sight area is behind the yellow diaphragm.

On the non-marine cap the level can be seen on the front of the cap.


Q. How full should it be?

A. The marine cap should be about ½ full, less than ½ makes it hard

to see but will be fine for lubricating. The non-marine cap should be

filled to the full line on the cap.


Q. That doesn’t sound like much lubricant, is that enough?

A. Putting more into the hub would only be wasting money. Centrifugal force keeps throwing the lubricant into the largest part of the hub and onto the bearings. The bearings are constantly being bathed in lubricant, even with that amount of lubricant.


Q. Do I ever need to change the lubricant?

A. It is recommended that the lubricant be changed once a year to remove any moisture that has formed from condensation.


Q. How do I change the lubricant?

A. Just remove the plug with the allen wrench, turn the wheel with the opening to the bottom and allow the lubricant to drain out. Remember, there is only 1 ½ to 2 ounces in each hub and it is dispersed throughout the hub, so it will take a little time to drain out. Raising the opposite side of the trailer will help. Drain the lubricant into a paper cup and dispose of in garbage or compost bin. When changing the lubricant, check the tire play for bearing wear and tighten if needed. To refill, turn the wheel with the opening up and refill to the recommended level. Give the lubricant time to flow to the back bearings and refill as needed to the recommended level.


Q. Will the lubricant change color?

A. The lubricant will remove any residual petroleum left in the pores of the hub and will discolor the liquid. It will become a grayish color. Even after several changes the liquid will not remain the pink color. It will turn gray, but take longer.


Q. How many miles will the system last?

A. The system should last for thousands of miles. Paved road miles will be much easier on the rear seal than a lot of gravel miles. It is difficult to put a time or mileage life on the system. Keep a visual check on the lubricant level. As the rear seal begins to wear you will notice the lubricant level changing.


Q. What comes in the kit?

A. Everything that is needed to convert one axle, except the bearings. It is recommended

to change the bearings unless it’s on a new installation or the bearings have just been

changed. The kit includes the drill bit and self-tapping screws, lubricant for the installation

and one change, seals and sleeves to fit your spindle to hub combination, sleeve driver,

Liqua-Lube caps and installation instructions.


Q. How do I know which kit I need?

A. There is a sizing chart that will tell how to measure. The measurement of the spindle where the seal rides and the inside diameter of the hub will tell what kit is needed.


Q. Is it easy to install?

A. Yes. When the hub is all apart, clean it very thoroughly getting rid of all petroleum. The lubricant will not mix with petroleum. Install the stainless steel sleeve, the driver is in the kit. Drill three small holes in the face of the hub, the drill bit is in the kit and the instructions tell one how to do that process. Cast iron drills easy and the hole is only ¼” deep. Assemble and adjust clean and dry, install the cap on the hub, turn the fill hole in an up position and fill with the yorker spout bottle to the fill line on the non-marine or ½ full on the marine version. Remember the sight area is behind the yellow diaphragm. There should not be any liquid showing in the face of the MARINE cap.


Q. Can I call the factory if I have any questions or problems?

A. Yes, 1-800-561-9917 .

Liqua-Lube It! or Lose It!

LIQUA-LUBE - Environmentally Friendly Oil Bath Based Trailer Hub Lubrication System