[Tech]

DIY Workshop: Linkage Maintenance

1 month ago | Words: Ian Hancock | Photos: Ian Hancock

If your rear suspension’s action has become stiff or sticky, there may be a problem with your shock absorber. But it’s much more likely that your bike’s linkage bearings are in need of fresh grease, or to be replaced altogether. Over time, the grease in the bearings can break down through heat or get blasted away by your pressure washer. So it’s a good idea to check and grease your bearings once or twice a year to prolong their life and allow your suspension to work at its best. Checking and greasing the linkage bearings can be completed in less than an hour and doesn’t require the swingarm or shock to be removed.

1. Remove the bolts

Once your bike is clean and on a stand, remove the linkage bolts. There’s no need to remove the swingarm or shock as all fasteners are accessible from under the bike. However, you may have to remove the lower chain roller to properly access and remove some of the linkage bolts.

2. Clean the area

If regularly maintained, the linkage bolts should just push out easily. If they’re being difficult, use a soft metal rod and hammer to gently coax the bolts through. Now give the linkage a thorough wash, using a heavy-duty degreaser or brake cleaner.

3. Access the races

Using a small screwdriver, carefully remove the bearing seals. Then push out one inner bearing race, taking care not to disturb the needles. If one needle falls out, they’ll all fall out, and you’ll have to carefully put them back in. So it’s a good idea to keep your hands underneath the linkage to catch any needles that may drop.

4. Clean the bearings

Now give the needles, the inner bearing race and the inside of the bearing itself a really good clean. Use a degreaser to remove the old grease and any grit, and inspect the race and needles for any inconsistencies, wear or damage.

5. Apply the grease

Being careful not to allow any of the pins to fall out, use your pointer finger to apply a thick layer of grease over the needles while keeping them in place. Work the grease into the needles, then put another thick smear over the needles and the inner bearing race.

6. Repeat & Reassemble

Slide the inner bearing race back in and re-install the seals. Repeat the process for all bearings, including the lower shock bearing. Reassemble the linkage, making sure each bolt has a healthy nut and washer and a coating of a copper-based anti-seize lubricant or grease.

Inspection

When inspecting your linkage bearings, you want to ensure that the needles are in good condition. That means no rust, gouges or other wear marks. Also inspect the inner and outer bearing races for corrosion or wear. Your finger is a good gauge, so run it over all metal surfaces. If the parts don’t feel smooth, they’re probably already past their used-by date. If anything seems even slightly worn, you’re better off replacing those parts because semi-flogged bearings will fail surprisingly fast and destroy your linkage knuckles altogether.

Expert Tips w/ Teknik’s Nick Dole

  • Of all the bearings in your linkage, the bottom shock bearing generally wears the quickest.
  • Linkage bearings prefer a quality grease that resists breaking down with water, truck wash and light degreasers. If you don’t have a motorcycle-specific grease, trailer wheel-bearing grease is a good alternative.
  • Put a copper-based anti-seize lubricant on the linkage bolts to make life easier next time you service the linkage. If you don’t have anti-seize, use grease. Just don’t put them in dry.
  • If you’re careful with the bearing seals, they can be re-used.
  • Always tighten the linkage bolts back up to the manual’s specified torque settings. Though it’s rare, overcranking the nut will squeeze and bind the bearings and accelerate their wear.

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