Mack F series

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Mack F series
Manufacturer Mack Trucks
Production Worldwide
Body and chassis
Class Truck
Body style Truck (cab over engine)
Transmission Mack (manual)
Predecessor Mack H series
Successor Mack Cruise-Liner (Created 1975)

The Mack F series was the third generation of cabover trucks from Mack Trucks. Its production began in 1962 and ended in 1981. It was produced primarily as a set-forward axle truck but a setback axle version was shipped overseas (from the USA). The cab came in a 50 inch (1371.6 mm) day cab (no sleeper). Sleeper models included a 72 inch (1828.8 mm), 80 inch (2032 mm) and later a "bustle back" was added that lengthened the sleeper to 86 inches (2184.4 mm).

Model range[edit]

  • F6xx
  • F7xx
  • F8xx
  • F9xx

Macks Improvements on fuel economy and engine life[1][edit]

The Maxidyne high-torque-rise engine design, in combination with the Maxitorque five or six speed transmission offers less shifting, easier operation and excellent fuel efficiency. Maxi-Miser road speed governor, used in conjunction with a numerically-low rear-axle ratio, provides addition fuel economy. Maxi-Miser governs the engine to 1600RPM in cruising gear. By reducing the governed engine RPM to 1700, and using multi-speed transmission, engine revolutions per mile are reduced, and improved fuel economy is gained by maintaining the engine operating range between 1300 and 1700RPM which is the most efficient area of the fuel curve.[2]


The F Model offered 4 different diesel engines, a Mack's Maxidyne and Thermodyne at 260-375 hp, Cummins - 250-350 hp, Detroit Diesel - 270-430 hp and Caterpillar - 325 hp. A wide range of diesels was also offered. From the B61 up the ENDT 673 turbocharged I6 and END 864 V8 were offered. From the B73 up Cummins 855 cu in (14.0 L) I6s up to the NTC335 were available.

  • Cat3406 is a big-bore diesel available in both high-torque-rise and conventional torque-rise versions
  • Detroit Diesel 92 series provides relatively constant horsepower. With the recommended 9-speed transmission, it permits less shifting while maintaining engine operation in an economical speed range.
  • Cummins Formula 350 “Big Cam” engine is governed at 1900RPM and provides 1065 ft/lbs of torque at 1300RPM. The formula 290 is also governed at 1900RPM and provides 930 ft/lbs of torque. Also available is the NTC engines.

The table shows the Mack diesel engines available in the series.[4][5]

Chassis Model Engine Displacement No. Of Cyl. Horsepower Torque
F712T ETAZ 673A 672 cu in (11.0 L) 6 315 hp (235 kW)@1900 1,050 lbf·ft (1,424 N·m)@1450
F747T NTC 290 855 cu in (14.0 L) 6 290 hp (216 kW)@2100 930 lbf·ft (1,261 N·m)@1300
NTC 290 855 cu in (14.0 L) 6 270 hp (201 kW)@2100 930 lbf·ft (1,261 N·m)@1300
FORMAUL 290 855 cu in (14.0 L) 6 290 hp (216 kW)@1900 930 lbf·ft (1,261 N·m)@1300
FORMAUL 290 855 cu in (14.0 L) 6 270 hp (201 kW)@1900 930 lbf·ft (1,261 N·m)@1300
F785T MAXIDYNE 675 672 cu in (11.0 L) 6 237 hp (177 kW)@1700 906 lbf·ft (1,228 N·m)@1000
F786T MAXIDYNE 676 675 cu in (11.1 L) 6 285 hp (213 kW)@1800 1,080 lbf·ft (1,464 N·m)@1000
F795T MAXIDYNE 865 866 cu in (14.2 L) 8 322 hp (240 kW)@2100 1,100 lbf·ft (1,491 N·m)@1350
MAXIDYNE 865C 866 cu in (14.2 L) 8 317 hp (236 kW)@2100 1,211 lbf·ft (1,642 N·m)@1350


The Mack F series truck uses taper-leaf front springs, which helps to provide a smoother ride. Taper-lead springs practically eliminate the inter-leaf friction, which is common with multi-leaf spring systems. The taper concept uses springs of equal length and different contour, to assure the springs do not slide against one another while in normal operation. This arrangement, accompanied by forged aluminum rear brackets and shackles equate to a comfortable ride.

  • Front axels rated to 18, 000 lbs. (8172 kg). Constructed from drop-forged I-beam construction.
  • Power steering is available.

Dual reduction are standard on Mack bogies, with straight-trough dual-reduction drive carriers as standard, requiring no transfer gearing and provide excellent driveline angles. This design, exclusive to Mack, permits shorter wheelbases, extended “U” joint life, lower bearing side loads and reduced vibration. The custom engineered frames are the envy of the industry.

  • Rear axels rated to 23, 000 lbs. (10 454 KG)
  • MAX. GCW 75, 000 lbs

Chassis Equipment[7][edit]

  • 50 Gallon Fuel Tank
  • Automatic reset circuit breakers
  • Back-up Light
  • Break-away safety valve
  • Cab roof vent
  • Combination heater and defroster, 42000 BTU
  • Combination stop, tail, and rear turn signals(2)
  • Engine water conditioner(cummins engine)
  • Engine stop control
  • Horn, electric, single tone
  • I.D. & clearance lamps
  • Low air pressure buzzer
  • Two rear view mirror
  • Undercoating
  • Vertical exhaust

Extensive Testing[8][edit]

  • All cabs are pressure tested to insure proper seal, keeping out noise, fumes, heat, cold, and moisture.
  • Every cab undergoes water tests to make sure it's sealed to stay dry inside all year round, and to stray warm in the winter and cool in the summer.
  • Mack Trucks are designed to be quiet. Interior sound levels are well below BMCS specifications. A special compound is applied to the floor to prevent rust, also helps reduce cabin noise.
  • Engines, transmissions, and axles are dynamometer-tested for noise, leaks and vibrations.

Exclusive Mack Finish[edit]

A Mack truck is unique to all other trucks due to its offering of additions, which transform the working truck into a rolling luxury vehicle. Mack allows the addition of aluminum step and walk grating, chrome air intake and exhaust stack, stainless exhaust shield, stainless steel grab handle, chrome door handles, chrome air horns and batter box, polished aluminum fuel tanks and polished aluminum bumpers, and polished West Coast Mirrors.

See also[edit]


  1. ^
  2. ^
  3. ^
  4. ^ Mack, Trucks, ed. (1970). Owners Manual (1 ed.). Mack. 
  5. ^ Forier, Louis C., ed. (1973). Motor’s Truck & Diesel Repair Manual (26 ed.). Motor. pp. 1003–1004, 1107–1109, 1250. ISBN 0-910992-16-9. 
  6. ^ Mack, Trucks, ed. (1970). Owners Manual (1 ed.). Mack
  7. ^ Mack, Trucks, ed. (1970). Owners Manual (1 ed.). Mack
  8. ^