Kenworth T680 Maintenance Parts Checklist
The Kenworth T680 is one of the most common tractors on I-78 and the broader Lehigh Valley freight corridor, and keeping one in service means staying ahead of a predictable set of wear parts. This checklist covers what to watch, roughly when, and where the part lives on the truck.
5 min read
In this article
- Every oil change
- Every 1–2 oil changes
- Brake system
- Suspension & steering
- Cooling system
- Electrical
- Where to source T680 parts
- FAQ
Every oil change (typically 15,000–25,000 mi depending on duty cycle)
- Oil filter — spin-on or cartridge depending on engine spec; confirm against the number on the old filter.
- Fuel filter/water separator — check for water in the bowl at every oil change interval, replace on schedule.
- Engine oil — per your PACCAR/Cummins/PACCAR MX spec.
Every 1–2 oil changes
- Cabin air filter — often forgotten, but a clogged cabin filter affects HVAC performance and defrost speed in winter.
- Air filter (engine) — check restriction gauge; replace at threshold rather than on a fixed mileage.
Brake system (inspect at every PM, replace as worn)
- Brake pads/shoes — inspect lining thickness.
- Brake drums — check for cracking, heat checking, and out-of-round wear, especially on trucks running mountain grades.
- Chambers and slack adjusters — verify stroke is within spec.
Suspension & steering (inspect every PM, replace on symptoms)
- Shock absorbers — leaking or bouncing shocks reduce tire life and steering control.
- Torque rods and bushings — worn bushings show up as clunking or uneven tire wear before the rod itself fails.
Cooling system (seasonal + as needed)
- Coolant level sensor — a common nuisance-fault item; confirm before assuming a bigger cooling issue.
- Coolant/antifreeze — check concentration each season change.
Electrical
- LED marker and headlight bulbs/assemblies — DOT compliance issue if out; cheap to keep spares on the truck.
Where to source T680 parts
Everything above is stocked and filtered specifically for the platform in our Kenworth T680 collection, pulling from our broader Kenworth Truck Parts & Accessories inventory. For system-specific browsing: filters, brakes, suspension, cooling, and LED lighting.
FAQ
Q: How often should I replace T680 suspension bushings?
A: There's no fixed mileage — inspect at every PM. Clunking over bumps, uneven tire wear, or visible cracking in the rubber are the signs to replace rather than wait.
Q: Do I need OEM parts for a T680, or is aftermarket okay?
A: Quality aftermarket parts (Fleetguard, TRP, Gabriel, Meritor, and similar brands we stock) meet or exceed OE spec for most maintenance items and cost meaningfully less — just match fitment carefully using the cross-reference numbers in the listing.
Q: Can you help me confirm the right part for my specific T680 spec?
A: Yes — call (610) 285-7317 or WhatsApp 484-619-8435 with your VIN or the part number off the old component, and we'll confirm fitment before you order.
Related guides
United Truck Parts and Tires — Breinigsville, PA. Fast shipping along the I-78 corridor. Financing available through SnapFinance.