Trailer Wheel Bearings, Hubs & Grease Seal Care

1. Locate axle identification. Park on firm, level ground with the trailer securely chocked. Read the axle/hub manufacturer label or trailer paperwork for axle capacity, hub model and service schedule.
2. Identify the hub configuration. A serviceable hub commonly has removable bearings and seals with a dust cap or bearing protector. Other hubs have sealed or integrated units requiring different servicing.
3. Check wheel and tire specifications. Record the wheel size, tire load rating, axle rating and wheel bolt pattern from reliable labels. Do not guess replacement bearings by appearance alone.
4. Find documented lubricant type. Use the hub or axle manufacturer documentation for compatible marine grease, applicable grease points, seals, torque and inspection intervals.
5. Set your maintenance plan. Note immersion frequency, highway towing conditions and service history. Replace missing identification or get qualified axle assistance before ordering parts.

Important: One hub design cannot be assumed to match another. A sealed or prepacked hub may not be refillable or repackable.

1. Secure the parked trailer. Park on firm level ground, engage the tow-vehicle parking brake if connected and chock wheels. Never work beneath a trailer supported only by a tongue jack.
2. Inspect visible dust caps. Look for missing caps, damaged bearing protectors, cracks, loose covers or grease thrown onto the inside of a wheel.
3. Look behind the hub safely. Without crawling underneath an unsupported trailer, inspect accessible rear seal areas for oil or grease leaks, road debris, and excessive corrosion.
4. Recognize movement and sound warning signs. A clunk while towing, rumbling, wheel looseness or abnormal vibration can indicate hub, bearing or lug trouble. Have a qualified person check raised-wheel play using appropriate stands and procedures.
5. Document and resolve faults. Mark any leakage, damaged caps, unusual wheel movement or noise as needing attention. Do not tow if the hub appears loose or the bearing may be failing.

Important: Jack placement, wheel lifting and wheel-bearing endplay checks must follow the axle/trailer manual. Never rely on a jack alone.

1. Stop in a safe place. After a normal tow, stop on level ground away from traffic, chock wheels, and keep clear of hot brakes or spinning/moving parts.
2. Check cautiously for abnormal heat. Do not put your hand directly on a hot hub. When safe, use a noncontact infrared thermometer and compare comparable hubs under similar conditions.
3. Consider brake drag as a cause. One hub significantly hotter than its mate may indicate bearing trouble, a dragging brake or other issue. Temperatures alone cannot identify the cause.
4. Check after freshwater exposure. After retrieval, look for fresh water contamination, missing caps or lubricant escaping at the seal. Avoid prolonged immersion of overheated hubs; follow the axle manual.
5. Stop for smoke, odor, heat or grinding. If a hub smokes, smells burned, is abnormally hot, grinds or wobbles, do not continue towing. Let a qualified service provider determine whether bearings, brakes or seals failed.

Important: No single temperature reading proves bearing safety. Braked axles can run warmer; compare like-for-like assemblies and investigate large differences.

1. Read the exact hub instructions. Identify whether your hubs are sealed, oil-bath, grease-packed or equipped with grease fittings/bearing protectors. Do not add grease to a nonserviceable hub.
2. Verify lubricant compatibility. Use only the lubricant recommended by your axle or hub manufacturer. Mixing incompatible greases can damage performance; never substitute ordinary oil for bearing grease.
3. Clean and inspect protection hardware. Wipe exterior surfaces with a clean cloth and check for missing caps, displaced protectors, broken seals and contamination around fittings.
4. Avoid overpressurizing a grease cavity. Where the manufacturer permits owner greasing, follow its specified quantity, speed and pressure. Pumping in excessive grease may damage the inner seal.
5. Record every service. Write down lubricant brand/type, serviced hubs, missing parts and the next manual-specified interval. Seek qualified help for leaks or unknown grease contents.

Important: A bearing protector does not eliminate bearing inspection or repacking requirements. A damaged rear grease seal can let water enter despite a full-looking cap.

1. Review service intervals. Check the axle maker service schedule and trailer use conditions, including frequent freshwater immersion and long road trips. Do not invent a universal interval.
2. Recognize contaminated lubricant. Milky-looking grease, visible moisture, metallic particles or heat-damaged lubricant are reasons for qualified inspection, cleaning and possible replacement.
3. Inspect component condition professionally. A qualified technician can examine bearing rollers/races, hub bore, spindle surfaces and grease seals for pitting, scoring, play or discoloration.
4. Replace worn components correctly. Use verified matched parts and new seals when required. Install and adjust serviceable bearings using the exact prescribed torque, endplay and cotter-pin procedure.
5. Verify before the next tow. After service, record replacement parts, wheel fastener torque and the performed checks. Follow the maker’s recheck instructions; stop towing if grinding or unusual heat returns.

Important: Improper bearing adjustment, wheel fastener torque or seal installation can cause wheel loss. If you are not equipped for the specific axle, use a qualified trailer mechanic.

1. Identify the trailer and axle. Enter boat/trailer identification, axle/hub type if known, and where the inspection was made.
2. Inspect visible components. Check dust caps, bearing protectors, rear grease seals, wheels and fasteners visually for leaks, missing parts and damage.
3. Note symptoms from towing. Document unusual heat, rumble, vibration, grease loss or water contamination following recent launches.
4. Mark items requiring action. Use OK, Monitor or Action for each inspection line. A visibly loose or overheated hub, damaged bearing or seal leak requires service before a trip.
5. Print the form and follow up. Select the green print button immediately beside the inspection form to print only the checklist. Use the red button to print this page with all six expanded guides.

Important: This owner inspection form does not substitute for an axle-specific service manual or a qualified hub examination.