ADJUSTMENT AND LUBRICATION
See Figure 1
Only the front wheel bearings require periodic service. The lubricant to use is high temperature disc brake wheel bearing grease meeting NLGI No. 2 specifications. (This grease should be used even if the truck is equipped with drum brakes; it has superior protection characteristics.) This service is recommended at the specified period in the Maintenance Intervals chart or whenever the truck has been driven in water up to the hub.
Before handling the bearings there are a few things that you should remember:Remember to DO the following:
- Remove all outside dirt from the housing before exposing the bearing.
- Treat a used bearing as gently as you would a new one.
- Work with clean tools in clean surroundings.
- Use clean, dry canvas gloves, or at least clean, dry hands.
- Clean solvents and flushing fluids are a must.
- Use clean paper when laying out the bearings to dry.
- Protect disassembled bearings from rust and dirt. Cover them up.
- Use clean rags to wipe bearings
- Keep the bearings in oil-proof paper when they are to be stored or are not in use.
- Clean the inside of the housing before replacing the bearings.
- Don't work in dirty surroundings.
- Don't use dirty, chipped, or damaged tools.
- Try not to work on wooden work benches or use wooden mallets.
- Don't handle bearings with dirty or moist hands.
- Do not use gasoline for cleaning; use a safe solvent.
- Do not spin dry bearings with compressed air. They will be damaged.
- Do not spin unclean bearings.
- Avoid using cotton waste or dirty cloths to wipe bearings.
- Try not to scratch or nick bearing surfaces.
- Do not allow the bearing to come in contact with dirt or rust at any time.
See Figure 2
You will need a special claw type puller for this job to remove the inner bearing and the steering knuckle grease retainer if you truck has drum brakes.
Procedures are basically the same for either disc or drum brakes.
- Remove the brake drum or brake caliper, following the procedure outlined in Brakes .
- It is not necessary to remove the drum or disc from the hub. The outer wheel bearing will come off with the hub. Simply pull the hub and disc or drum assembly towards you off the spindle. Be sure to catch the bearing before it falls to the ground.
- Drum brakes: The inner bearing and grease retainer must be pulled from the spindle with the claw puller. Be sure that the fingers of the tool pull on the seal, and not on the bearing itself. Discard the grease retainer.
Disc brakes: The inner bearing will have to be driven from the hub along with the oil seal. Use a brass rod as a drift and carefully drive the inner bearing cone out. Remove the bearing and the oil seal. Discard the seal.To install:
- Clean the bearings in solvent and allow to air dry. You risk leaving bits of lint in the races if you dry them with a rag. Clean the bearing cups in the hub.
- Inspect the bearings carefully. If they are worn, pitted, burned, or scored, they should be replaced, along with the bearing cups in which they run.
- You can use a brass rod as a drift, or a large socket or piece of pipe to drive the inner and outer bearing cups out of the hub.
- Install the new inner cup, and then the outer cup, in that order, into the hub, using either the brass drift or socket method outlined earlier.
Use care not to cock the bearing cups in the hub. If they are not fully seated, the bearings will be impossible to adjust properly.
- Drum brakes: Press a new grease retainer onto the spindle. Place a large glob of grease into one palm and force the edge of the inner bearing into it so that the grease fills the bearing. Do this until the whole bearing is packed. Press the inner bearing into the spindle, seating it firmly against the grease retainer.
Disc brakes: Coat the inner bearing cup with grease. Pack the inner bearing with grease as outlined for drum brakes, and press the inner bearing into the cup. Press a new oil seal into place on top of the bearing. You may have to give the seal a few gentle taps with a soft drift to get it to seat properly.
- Install the hub and drum or disc assembly onto the spindle. With drum brakes, first thoroughly coat the inner cup with grease.
- Coat the outer bearing cup with grease. Pack the outer bearing with grease and install into the cup.
- Pack the grease cap with grease and set it aside. It will be replaced last, after the preload adjustment. You can put the grease away now.
- Install the lock washer, and castellated nut (lock washer, nut, and adjusting castle nut with disc brakes) loosely, and go on to the preload adjustment following.
- While turning the hub forward, tighten the castellated nut (plain nut on disc brakes) to 35 ft. lbs. (21 ft. lbs. with disc brakes).
- Rotate the hub a few more times to snug down the bearings.
- Retighten the nut to the above specification. Unscrew it 1 / 6 of a turn and lock it in place with a new cotter pin. On disc brakes, snug the adjusting nut up against the nut and then back it off the required distance to insert a new cotter pin. You should not have to back it off more than 1 / 6 of a turn.
- Install the grease cap, and wipe off any grease that oozes out.
- Install the front wheel and a couple of lug nuts. Check the axial play of the wheel by shaking it back and forth; the bearing free-play should feel close to zero, but the wheel should spin freely. With drum brakes, be sure that the shoes are not dragging against the drum.
- If the bearing play is correct with drum brakes you can install the rest of the lug nuts. With disc brakes, remove the wheel, replace the caliper, then install the wheel.
The following applies to early models without free wheeling hubs. For models with free wheel hubs, see the front drive axle section in Drive Train .
The front wheel bearings should be repacked every 12,000 miles (20,000 km), or once a year, whichever comes first.REMOVAL
- Remove the hub cap and loosen the lug nuts.
- Raise the front of the Cruiser and support it with jackstands.
- Remove the lug nuts and the wheel.
- Remove the cap from the axle shaft outer flange. Remove the snapring from the shaft.
- Remove the bolts which secure the axle shaft outer flange to the hub.
- Install two service bolts into the holes provided in the flange. Tighten the bolts evenly in order to loosen the flange. Withdraw the flange and the sealing gasket.
The flange should never be removed by prying it off; damage to the sealing surface could result in oil leaks.
- Remove the set screws and remove the brake drum.
- Straighten out the lockwasher and remove the adjusting nut, using a spindle nut wrench.
Removing the adjusting nut with a hammer and chisel will result in damage to the nut and the spindle threads.
- Remove the hub assembly, complete with the washer, bearings and oil seal.
- Remove the bearings from the hub.
Place all of the bearings, nuts, washer, and dust caps in a container of solvent. Cleanliness is basic to wheel bearing maintenance. Use a soft brush to thoroughly clean each part. Make sure that every bit of dirt and grease is rinsed of, then place each cleaned part on an absorbent cloth and let them dry completely.
Inspect the bearings for pitting, flat spots, rust, and rough areas. Check the races on the hub and the spindle for the same defects and rub them clean with a rag that has been soaked in solvent. If the races show hairline cracks or worn, shiny areas, they must be replaced with new parts. Replacement seals, bearings, and other required parts can be bought at an auto parts store. The old parts that are to be replaced should be taken along to be compared with the replacement part to ensure a perfect match.
Pack the wheel bearings with grease. There are special devices made for the specific purpose of greasing bearings, but, if one is not available, pack the wheel bearings by hand. Put a large dab of grease in the palm of your hand and push the bearing through it with a sliding motion. The grease must be forced through the side of the bearing and in between each roller. Continue until the grease begins to ooze out the other side and through the gaps between the rollers; the bearing must be completely packed with grease.INSTALLATION
- Install the inner bearing cone and the oil seal.
- Pack the hub with grease, and install the outer bearing cup.
- Assemble the brake drum to the hub.
- Install the hub and drum assembly over the spindle and then install the outer bearing.
- Install the claw washer and adjusting nut with the spindle nut wrench.
Adjust the bearing preload in the following manner:
- After tightening the adjusting nut with the spindle nut wrench, rotate the wheel back-and-forth in order to seat the bearing.
- Loosen the adjusting nut 1 / 8 - 1 / 6 of a turn.
- Check the brake drum for free rotation.
- Install the lockwasher and the locknut. Use the spindle nut wrench to tighten the locknut.
- Bend up the tabs on the lockwasher.
- Install the axle shaft flange and gasket. Tighten the retaining bolts to 11-16 ft. lbs.
- Install the bolt on the end of the outer shaft. Pull out on the shaft while installing the snapring.
- Install the flange cap.
- Install the wheel and the hub cap. Lower the vehicle.