Clutch & Drivetrain

Clutch discs, HD belts, and wheel-end bearings for Class 8 drivetrains. 4 parts in this department.

Parts in this category

Sachs

Power path parts

Clutch friction, serpentine belts, and hub bearing components that often share one lift window.

Four drivetrain SKUs display above; U.S. dollar prices are on the cards.

Shop notes

Clutch discs, heavy-duty Micro-V belts, and wheel-end bearings decide whether a tractor leaves the shop or waits on a second parts order. This department stocks an organic 14-inch clutch disc, a Gates HD belt, a Timken cone, and a matched NTN cone and cup set so hub seal jobs can finish without a scavenger hunt.

Clutch work is alignment work. Support the transmission, use a pilot tool, and replace the throwout path hardware the OEM calls for. A new disc on a glazed flywheel is a comeback. Belts that chirp after a fan clutch job often share rib count but not length — read K080670HD against the routing card under the hood.

Bearings fail with heat color and noise long before the hub seizes. Pair cone and cup sets when the race is damaged; installing a new cone on a fretted cup is false economy. Keep hub seals from the brakes department in the same cart when you open a wheel end.

Fitment tables list common Class 8 makes. Always confirm spline count, belt length, and cup numbers against removed parts before PayPal checkout.

Disc, belt, and bearing basics

Clutch discs need correct diameter, spline count, and facing type. Belts need length and rib count. Bearing kits need matching cup and cone.

Do not order a clutch from memory of the last truck in the bay — photograph the disc and the transmission tag.

Serpentine routing stickers under the hood beat guesswork after a shredded belt.

Measure free play and inspect facing rivets before you condemn a clutch.
For bearings, look for grease at the seal and listen for growl at road speed.
After belt install, confirm every accessory pulley sits in its rib and the tensioner mark is in range.
Email support@aonetruckauto.com with spline and belt photos when tags are missing.

Evidence to keep

Save the old disc, belt, and bearing cone until the truck completes a loaded shift without noise or slip.

Photograph flywheel scoring before you bolt on fresh friction — glazing shows in the photo when memory does not.

Mixed fleet usage

Sachs-style clutch discs, Gates fleet belts, and Timken or NTN hub bearing sets here support mixed Class 8 linehaul and vocational trucks.

Detailed chassis rows live on each SKU page linked from the grid.

Noise and engagement

Drivetrain noise and engagement changes deserve prompt inspection. Waiting for a roadside failure costs more than a planned bay visit.

Torque specs and end play targets come from axle and transmission OEM literature. Review shipping policy and returns and refunds before opening bearing races.

Bearing set habits

Bearing set crosses are common; always pair cup and cone as sold and set end play to the axle chart.

Sales from this department are made by HEAVY TRUCK PARTS, INC.; manufacturer names indicate interchange only.

Drivetrain SKU notes

Individual SKU blurbs; pricing on cards only.

Sachs 33050 is a sprung-hub organic clutch disc for Class 8 manual and automated manual service — fitment on Sachs Organic Clutch Disc 14 in.

Gates K080670HD is a Green Stripe heavy-duty serpentine belt for DD15 and MX-13 accessory drives — length and ribs on Gates Heavy-Duty Micro-V Belt K080670HD.

Timken HM218248 is the inner cone for Class 8 wheel-end overhauls that specify that geometry — order cone details at Timken Tapered Roller Bearing HM218248.

NTN set 4T-HM218248/HM218210 supplies matched cone and cup tapered rollers for hub jobs — confirm on NTN Tapered Bearing Cone and Cup Set.

These four parts are the Clutch and Drivetrain assortment published here.

Clutch and bearing work puts the truck on stands and the transmission at risk if support is casual. Follow OEM support points.

Belts that shred can take out wiring looms and tubes. Inspect idlers when a belt fails early — a seized pulley destroys replacements.

Keep spline grease and the correct alignment tool in the clutch bay so discs go in square the first time.

Transmission support

Sachs 33050 disc replacement should include inspection of the clutch brake, if equipped, and the pilot bearing while the transmission is out. Skipping those items turns a clutch job into a second removal weeks later.

K080670HD belt length is unforgiving — route the belt by the diagram, then rotate the crank by hand one full turn listening for rib hop on the alternator pulley.

Hub overhaul pairing

Timken HM218248 cone alone is for shops that already have the cup in stock; most overhauls should order the NTN matched set when both races show spalling.

Set end play with the dial indicator the axle maker specifies — guessing with feeler gauges on tapered bearings invites overheating on the first loaded descent.

Automated manuals still use friction discs like Sachs 33050 — verify transmission model on the tag before assuming a manual-only spline count.

Order hub seals from the brakes bay in the same cart as NTN or Timken bearings so the wheel end closes in one trip across the yard.

Gates K080670HD belongs on the same work order as fan clutch or alternator jobs when the old belt shows rib cracking near the automatic tensioner — replace the tensioner when the belt failed from skew, not age alone.

Photograph the transmission tag when ordering Sachs 33050 so spline and damper specs match automated manual versus full manual listings.

NTN 4T-HM218248/HM218210 sets should be installed with clean grease and new hub seals — reusing old seal lips after a bearing job invites the same leak in two weeks.

Timken HM218248 alone is the right buy when your crib already stocks the matching cup — otherwise the NTN matched set saves a second freight charge from HEAVY TRUCK PARTS, INC.