• Wheel Nut Torque: Check at 10, 25, 50, and 250 miles.
• Tire Pressure: Ensure it meets the manufacturer’s requirements.
• Brake Adjustment: Check at 250 miles.
• Brake Synchronization: Check before operating the trailer.

1. Lift and support the trailer frame.
2. Remove the wheel.
3. Remove the grease cap carefully.
4. Remove the cotter pin from the spindle.
5. Unscrew the spindle nut and remove the spindle washer.
6. Pull the hub, brake drum, or rotor off the spindle, ensuring the outer bearing cone does not fall out.
7. Place the unit on a clean surface to prevent contamination.

Inspect the inside diameter where brake shoes contact the drum. If excessive wear, heavy scoring, or out-of-round wear exceeds .020”, the drum should be turned to the following maximum bore diameters:

• 7” Brake Drums: 7.090” Diameter
• 10” Brake Drums: 10.060” Diameter
• 12” Brake Drums: 12.090” Diameter
• For electric brakes, also inspect the armature face where the brake magnet contacts the drum.

1. Place the lubricated unit onto the spindle.
2. Tighten the spindle nut to 30-40 ft.-lbs. while turning the hub.
3. Loosen the spindle nut completely, then finger-tighten it without moving the hub.
4. Insert the cotter pin and bend its legs over the spindle.

Inspect bearings for wear or damage such as flat spots, broken cages, pitting, or corrosion. If replacement is needed:

1. Tap the existing bearing cup out of the hub.
2. Clean the bore area.
3. Tap the new bearing cup into the hub ensuring it is seated properly.