Test Drive: Mack Pinnacle

The Pinnacle is Mack's latest- generation premium tractor for over-the-road fleets and owner-operators

September 2007, - Test Drives

by Steve Sturgess, Executive Editor

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Test Vehicle Specs

Tractor Mack Pinnacle CHU603

Frame STEEL-266 X 90 X 8MM

Engine Mack MP8 484-C 485 @1800 rpm, 1,650 lb.ft @ 1100-1300 rpm

Clutch CL79815.5" ceramic

Transmission Mack Maxitorque ES T318LR 18-speed

Drive Axles Meritor 40-145

Axle Ratio 3.90 to one

Rear Suspension Mack Maxlite 40 AIR SUSP40K 52" spread

Front Axle Mack FLX12 12,K

Front Suspension Parabolic Taper Leaf 12,000#

Steering Sheppard HD94 STEERING GEAR POWER

Foundation Brakes

Front Meritor Q-Plus 15 x 4 Drums

Rear Meritor Q-Plus 16.5 x 7 drum with

MGM park on rear

Wheels Polished 8.25 x 22.5


Front Bridgestone R287 295/75R24.5

Rear Bridgestone M726 295/75R24.5

Fifth Wheel Fontaine SL3ASB air slide

Fuel Tanks Dual 93 gal aluminum

Cab Mack CAS68 HD Cab

Hood Fiberglass tilt

Cab Aero Options None

Seats Mack Proprietary Ultra-Leather

Sleeper 70" Mid Rise

Paint Black Gold Pearl w/ Cascade Vinyl Applique


Length 326

Width 96

Height 123

Wheelbase 246

Step Heights 17.5/18.5/14.5

Floor height 50.5

Baggage liftover 52.5

Frame ht @ fifth wheel 39

In Cab

Shoulder width 68.5

Windshield width 68.5

Height at standup point 62

Seat to ceiling 39-47

Belly room 8-20


(driver) 23-31

(passenger) 17-30

Footwell width

driver/passenger 25/21


Walkthrough seats 13

Width 83

Height at bunk 77.5

Bunk to ceiling 56

Bunk width 38

Clear floorspace 31x42


Turning circle

Left 74' 3"

Right 79" 6"

Closest sight to ground 22' 9"

Noise at

idle 59 dB (A)

Cruise 75

max accel 76

Jake 74

RPM @ 60 mph top gear 1370

Test Results

Average Fuel Consumption (day 2) 5.9 mpg

Average Speed 51 mph

Gross vehicle weight (on test) 76,000 pounds

Additional equipment

Meritor Wabco 318 (18.7 CFM) air compressor; 12V, 135A Delco 35SI alternator: 3-12V Mack batteries; Mack PowerLeash engine brake; 120V 1500 watt block heater; Behr fan and Borg Warner electronic fan drive; aluminum flywheel housing; Davco 382 fuel/water separator and heater/ 12V gear reduction starter; silicone coolant hoses; low voltage disconnect; Mack Cap muffler/diesel particulate filter; Mack Visibility doors w/ passenger peeper window; black polyurethane floor mat; accessory power outlets in center console; Two-spoke 18" leather steering wheel; adjustable steering column w/ telescoping tilt; halogen headlamps/foglamps; polished aluminum air reservoirs; Stemco Voyager rear seals; Haldex auto slacks; aluminum front hubs; power door locks.

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