Mack TrucksClass 8

Mack Trucks Keystone

The new standard for severe-duty Class 8 work.

Unveiled at ConExpo-Con/Agg 2026 as the direct replacement for the Pinnacle, the Keystone is a purpose-built vocational tractor offered for the first time in both axle-forward and axle-back configurations, with up to 6% better fuel efficiency than the Pinnacle. Order books open in Q3 2026.

Maker

Volvo Group

Years

2026–present

Body

Severe-Duty

Rating

Up to 80,000 lb GCWR

Power

Up to 540 hp

Applications

Construction, Logging, Agriculture, Heavy-haul

Engines

Mack MP13

Trouble with your Keystone?

Describe the symptom and Mike — the free AI truck consultant — will help you figure out what's wrong, which part is involved, and whether it's safe to drive. Free, no account.

Common replacement parts

Real products from the PartsNow catalog. Confirm fitment with Mike before ordering.

3030HNTRX - 3030 SPEC LONG SHAFT HNTRX BRAKE CHAMBER

3030HNTRX

3030HNTRX - 3030 SPEC LONG SHAFT HNTRX BRAKE CHAMBER

OTR10143 - AUTO SLACK ADJUSTER, 11/2-10DRIVE 5.5,6.5

OTR10143

OTR10143 - AUTO SLACK ADJUSTER, 11/2-10DRIVE 5.5,6.5

5-808330 - BRAKE KIT FOR 4709DEN SHOES

5-808330

5-808330 - BRAKE KIT FOR 4709DEN SHOES

370036A - OIL BATH SEAL

370036A

370036A - OIL BATH SEAL

348-4195 - HUB CAP (SENTINAL LARGE DIAM)

348-4195

348-4195 - HUB CAP (SENTINAL LARGE DIAM)

5008414PGBXW - AIR DRYER CARTRIDGE, PURAGUARD

5008414PGBXW

5008414PGBXW - AIR DRYER CARTRIDGE, PURAGUARD

11444 - GLADHAND BRACKET MOUNT

11444

11444 - GLADHAND BRACKET MOUNT

15W40 OIL - 15W40 OIL (ROTELLA) GAL JUG

15W40 OIL

15W40 OIL - 15W40 OIL (ROTELLA) GAL JUG

Brakes & Wheel End Air System Filtration Electrical & Lighting Suspension & Steering Cooling System Drivetrain Body & Cab Exhaust

Find parts at PartsNow.ai Call or text (865) 290-5485

Guides from the shop

Electrical & Lighting

Trailer ABS Light Won't Go Off? Sensor & Wiring Guide

Trailer ABS light staying on? Step-by-step diagnosis for wheel speed sensors, harness corrosion, and ECU faults before you swap parts.

Aftertreatment & Emissions

DEF Lines Freezing? Winter Prevention & Fixes for Fleets

Stop DEF freezing from parking your trucks. Learn heated-line checks, tank insulation, and SCR fault codes before derates hit.

Trailer & Coupling

Fifth Wheel Not Locking? Diagnosis & Fix Before It Fails

Fifth wheel not locking or slipping under load? Step-by-step diagnosis, lube checks, jaw inspection, and rebuild-vs-replace guidance.

More Mack Trucks models

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Pinnacle

The versatile day-cab and light-sleeper hauler.

Granite

The construction-site bulldog.

Titan

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LR

The low-entry trash specialist — now electric, too.

MD Series

Mack's return to the medium-duty class.

TerraPro

The cabover refuse and concrete specialist.

Pioneer

Mack's new flagship, redefining the long haul.

MD Electric

Mack's medium-duty workhorse goes all-electric.

LR Electric

The zero-emission garbage truck that already works the curb.

CH Series

The conventional that carried Mack into the modern highway era.

CL Series

The CH's muscled-up cousin built to pull serious tonnage.

Vision

Mack's aero highway sleeper before the Anthem name existed.

RD Series

The construction-site conventional that defined Mack tough.

DM Series

The set-back-axle mixer chassis Mack built for decades.

Super-Liner

The big-grille V8 brute of Mack's golden age.

R Series

The conventional that built Mack's reputation for nearly 40 years.

MR Series

The low-cab-forward cabover that ruled the curb for 30 years.

LE Series

The low-entry refuse cabover that paved the way for the LR.

MS Midliner

Mack's Renault-built medium-duty class entry.