Overview

Overview
This new 2027 Peterbilt 589 Traditional is a conventional day cab tractor built for hauling machinery on a lowboy. The application spec calls for a 53' two-axle lowbed trailer, a 140,000 lb gross combination weight and 100% highway operation, with a maximum grade rating of 6%. The GVWR is 80,000 lbs. It's set up for United States registry.

Engine & Drivetrain
Power comes from a Cummins X15 production series engine rated at 605 HP at 1,950 RPM, governed at 2,000 RPM, with 2,050 lb-ft of torque at 1,000 RPM. It meets 2024 emissions standards, and the engine is model year 2026. The powertrain is optimized for performance in vocational and heavy-GCWR applications. The engine includes a Jacobs compression brake with controls on the right-hand column, a 37.4 CFM air compressor and a PACCAR 160-amp brushed alternator. It also has a PACCAR 12V starter and three PACCAR AGM 12V batteries rated at 2,775 CCA. A battery jumper terminal and a low-voltage disconnect system are included. Cold-weather equipment includes an immersion-type 110–120V block heater and fuel heat for the fuel filter. There's also a PACCAR fuel/water separator with an extended service interval. Cooling is a high-efficiency system with a 2-speed fan clutch for frequent start/stops. Dual 15" premium stainless steel cowl-mounted air cleaners have slotted stainless caps.

Exhaust is a right-hand under-cab single-module DPF/SCR system with a DPF regeneration switch. It runs dual 7" chrome-plated standpipes, 36" tall with a clear coat and 45-degree curved tips. The engine has engine protection shutdown. The driver also gets a predictive cruise control package and a 12-pin remote PTO/throttle provision in the engine bay. Vehicle speed is capped at 68 MPH for the accelerator and 68 MPH for cruise control, with a typical operating speed of 68 MPH. PTO maximum engine speed is set at 1,400 RPM.

The Eaton RTLO20918B 18-speed manual transmission has an oil-to-water cooler, a black manual shifter, a self-adjusting clutch and a pre-damped clutch. A remote lube hose for the release bearing is mounted under the hood on the left rail. For PTO use, the transmission has bottom-mount PTO provisions, an HD input bearing and a park brake interlock. It also has one dash-mounted single-acting electric-over-air PTO control. The driveline is an SPL350 HD-XL main driveline with one midship bearing and an SPL250 XL interaxle driveline, both service-free. The rear axle ratio is 4.30.

Chassis & Axles
The wheelbase measures 251". Cab-to-axle is 160.9", front axle to back of cab is 90.1" and cab to end of frame is 215.6". The frame uses 10-3/4" steel rails to 354" at 3/8" thickness with a full steel inner liner, and the rails are zinc-coated for corrosion protection. The front spring brackets are heavy-duty iron, front and rear. The end of frame is tapered with a crossmember that includes a kingpin cutout.

Up front is a PACCAR FX-20 steer axle rated at 20,000 lbs, with a 4" drop and wide track. It uses TRW THP60 dual-gear power steering and a frame-mounted power steering reservoir with a cooler. The front brakes are air disc with severe-service rotors on PHP10 iron Preset+ hubs.

The rear axle is a Dana Spicer D46-172 tandem rated at 46,000 lbs, with a heavy-wall housing and a drive-axle lube pump. It has tandem diff locks with a speed interlock, plus a separate dash control for full-lock traction control. The rear brakes are air disc on the tandem drives, with PHP10 iron Preset+ hubs and severe-service disc brake rotors. Synthetic lubricant is used in all axles.

A Watson-Chalin SL2065 self-steering pusher axle rated at 20,000 lbs is spaced 49" ahead of the forward drive axle and includes its own air tank. Its lift regulator and gauge sit on the dash beside the driver's seat. When lifted, the pusher is stowed lower to maximize body clearance.

Axle ratings are 20,000 lbs front, 20,000 lbs first intermediate (pusher), 23,000 lbs second intermediate and 23,000 lbs rear. Safety systems include Bendix ESP electronic stability with ATC, 6S/6M ABS and a tire pressure monitoring system.

Suspension
The front suspension uses 20,000 lb taper leaf springs with Tenneco steer axle shocks, greasable front spring pins and 70 mm front spring spacer blocks. The rear suspension is a Peterbilt Air Trac rated at 46,000 lbs with a 52" axle spread. It has air springs with internal bumpers and a dash-mounted dump switch with an indicator light.

Cab & Interior
The aluminum day cab has a 121" BBC aluminum hood with a polished crown, spring tilt assist, severe-service hood reinforcements and 2" wide fender lips. Inside is a Premier interior in Alpine Gray with rubber flooring, thermal insulation, cab air suspension and Peterbilt keyless entry.

The driver seat is a Peterbilt LX Premium: air ride, high back, heated, leather, with dual armrests. The passenger seat is a Peterbilt ST non-adjustable high-back vinyl seat with a left armrest and a battery box underneath. Seats are black. The premium leather-wrapped multi-function steering wheel has audio and cruise controls on a tilt/telescoping column. Other interior features include vanity mirrors, an ambient lighting package, a rear-wall deep record/map pocket, a dual USB charging port and a dash-mounted cigar lighter and ash cup.

Entertainment and communication include a ConcertClass AM/FM/WB radio with 3.5 aux, satellite radio, Bluetooth phone and audio, a USB port and a midlevel four-speaker package. CB terminal wiring comes with a microphone clip, a speaker and a header-mounted radio provision. Dual 48" CB antennas are mounted on the mirrors. Global telematics hardware is installed, along with a 5-year SmartLinq remote diagnostics subscription.

Climate control is a combo fresh-air heater and A/C. The cab has power door locks and windows, a one-piece curved windshield, dark window tint and a fixed 3-piece glass rear window. Exterior features include a stainless V-style outside sunvisor and a textured, NFPA-compliant entry grab handle. The mirrors are heated, motorized 7"x18" stainless West Coast style, with two 8" heated convex mirrors and a black look-down mirror over the passenger door.

The digital 15" instrument cluster displays transmission oil temperature, air filter restriction, tractor and trailer brake application pressure, engine hours, PTO hours and engine percent torque. It has bright gauge bezels. Additional 52 mm backlit gauges cover front and rear drive axle oil temperature (with guards), engine oil temperature, air suspension pressure, manifold pressure and pusher axle pressure. There's one additional dash switch with wiring. The cab also carries a fire extinguisher, a triangle reflector kit, a variable backup alarm (87–112 dB) and auto-reset circuit protection.

Body & Equipment
The fifth wheel is a Holland FW70 top plate on a Holland severe-duty 48" air slide with outboard mounting. It has ramps, a left-hand release and slide controls, with a fifth wheel height of 8.6"–9.25", set 5" behind the bogie centerline. The left-side frame-mounted deck plate has polished access steps.

The air system includes a Bendix AD-HF EP heated air dryer with a coalescing filter and extended purge, a spring brake relay and nylon chassis hose. High-mount aluminum air tanks sit back of cab with pull cords on all tanks. Brake controls include a non-self-returning dash-mounted hand valve. At the back of cab are 16' straight air and electrical lines with two 7-way plugs and a chromed hose tenna.

Fuel is carried in polished 26" aluminum tanks: an 80-gallon tank under the cab on the left with a polished non-slip step, and a 100-gallon split tank behind the cab on the left with a 50-gallon fuel section. Fuel and hydraulic tank straps are polished. A medium 24-gallon DEF tank sits back of cab on the right under a polished stainless cover. The polished battery/tool box has a complete aftertreatment cab entry with an aluminum non-slip step on the right side under the cab.

Up front is a deep tapered chromed steel bumper with a toe-step cutout and 2 tow points, plus a removable bugscreen behind the grille. Lighting includes heated LED pod headlights with integral turn signals, daytime running lights, five LED bullet marker lights and LED oval stop/turn/tail/backup lights in the end-of-frame taper. Auxiliary wiring is provided for under-cab lights, air-cleaner lights, a beacon/strobe at the rear sill and a load light. Dual 30" chrome round air horns have polished shields. Quarter fender brackets are mounted ahead of the pusher axle, and mudflap hangers are installed.

Paint is a two-stage Axalta finish in white on the cab, hood, fenders and roof, with a black frame.

Tires & Wheels
The front tires are BR M870 20-ply 315/80R22.5 on Alcoa 89U637 22.5x9.00 high-polish aluminum wheels. The pusher axle carries two BR M870 20-ply 315/80R22.5 tires on matching Alcoa 89U637 wheels. The eight rear tires are Conti HDL3 16-ply 11R24.5 with TPMS sensors, on Alcoa 985657 24.5x8.25 high-polish severe-service aluminum wheels. The outer wheel surfaces have a mirror polish and Dura-Bright finish on every axle, and wheel guards sit between the tandem wheels.

Warranty & Protection
This unit includes Peterbilt Class 8 standard coverage for 1 year/100,000 miles (160,000 km) and a base emissions warranty for 5 years/100,000 miles. It also includes 1 year of towing and mobile service coverage and a 5-year SmartLinq remote diagnostics subscription.