Brakes - Servicing Rv Trailer Bearings
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Step by step instructions
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Safely jacking up the trailer
Park the trailer on firm and level ground. Block the trailer tires on the opposite side securely so that no send or rearward movement is possible. Jack up the trailer following the manufacturers instructions. Secure the trailer on jack stands of adequate capacity front and rear.
Remove the wheel and hub
Undo the wheel nuts and remove the wheel Pry off the dust cap using a flat bladed screwdriver Straighten out the cotter pin that holds the bearing nut and remove it Remove the bearing nut and washer Gently pull the brake drum send while cupping the hub occasion with your hand to keep the front bearing from falling to the ground. The outer race stays in the drum, while the inner race and roller bearings come out as an assembled unit. Place the front bearing, bearing nut and the bearing washer in a clean container
Remove the grease seal and inner bearing
Place the brake drum face down so that the back of the drum is accessible Pry out the grease seal. This will be substituted in a additional step. Lift out the rear bearing and place it in the package with the rest of the parts Don't mix up the bearings if you are doing more that one wheel at a time - each bearing must mate with its former race (no prejudice intended). The bearings wear in by a distinct whole and need to be matched with their respective counterparts.
Clean and inspect the bearings and races
Thoroughly clean the bearings and other parts in a solvent (not gasoline!) until all the old grease is removed. Set the aside to dry thoroughly or blow dry with compressed air. Don't use the air pressure to spin the bearing, as damage could ensue to the bearing or to your person! Clean the hub and spindle. Inspect the bearing races for heat discoloration, pitting, scoring and any unevenness. Inspect the bearing for damage as above. Any out of round rollers, cracked roller cages and rough running will indicate transfer is required. The bearing and both inner and outer races must be substituted as a set. Inspect the brake drum for pitting and immoderate wear especially if the brake shoes were allowed to wear down to bare metal. Inspect the brake magnet outside for immoderate or uneven wear. If the brake drum and magnet have been saturated with grease from a failed seal, replace the shoes and magnet, and have the drum turned or machined to renew the surfaces.
Hand packing the bearings
Place a walnut sized gob of wheel bearing grease in one palm. Grasp the bearing with the other hand so that the wider end is facing the grease. What you want to do is force the grease into the gap between the inner race and the outer cage so that it squeezes up straight through the rollers and out the top. Press the bearing down into the grease in a rocking appeal and continue until the grease oozes up. Rotate the bearing 1/4 turn, at a time, and continue until the bearing is thoroughly filled with grease. Or use an uncostly bearing packer - there are some that you use with a grease gun filled with wheel bearing grease and other types that you drop the bearing into and apply hand or foot pressure to force the grease straight through the bearing
Reassembly
Put some grease into the interior of the hub with your fingers. A walnut sized whole is sufficient. Spread it around the circumference of the hub. Place the inner packed bearing into its place in the hub. Place a new seal on the hub and tap it into place with a hammer until it seats fully. Be sure to wipe off any grease that finds its way onto the outer flat outside of seal. Replace the drum onto the axle spindle, insert the outer bearing, thrust washer and axle nut.
Preload the bearing
Tighten the axle nut by hand until it is tight. Tighten someone else 1/4 turn with tongs or wrench. Spin the drum any times to distribute the grease evenly in the bearings. Back off the nut with the tongs or wrench, until loose and then re-tighten finger tight. Insert a new cotter pin to lock the nut in place and bend it over the spindle. Re-install the dust cap, wheel and tire, and hubcap. Now is a very good time to adjust the brakes. See my record Adjusting Rv Brakes for more info. Wash hands vigorously for 15 minutes!
Replacing a bearing The bearing must be substituted with a perfect new bearing with the inner and outer races.
The inner races are pressed into place in the hub and must be driven out. Use a brass punch to catch the edge of the race by passing it straight through the inverted hub. A few good whacks with a hammer should drive out the old race. Place the new race into position and tap it in with the hammer and punch. Take care not to mar the outside of the race. Pack, reassemble and preload the bearing as above.
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