Mack F series explained

Mack F series
Production:	1962–1981
Predecessor:	Mack H series
Successor:	Mack Cruise-Liner (Created 1975)
Class:	Truck
Body Style:	Cab over engine
Transmission:	Mack (manual)

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

• F6xx
• F7xx
• F8xx
• F9xx

Engines^[1]

The F Model offered 5 different diesel engines, Mack's Maxidyne and Thermodyne at 260-375 hp, Cummins - 250-350 hp, Detroit Diesel - 270-430 hp and Caterpillar - 325 hp.

• Cat3406 is a big-bore diesel available in both high-torque-rise and conventional torque-rise versions
• Detroit Diesel 71 series, provided power with a high torque curve.
• 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. The NTC series of engines was also available.

The table shows the Mack diesel engines available in the series.^{[2] [3]}

Chassis Model	Engine	Displacement	No. Of Cyl.	Horsepower	Torque
F712T	ETAZ 673A	6721NaN1	6	3150NaN0@1900	1050lbfft@1450
F747T	NTC 290	8551NaN1	6	2900NaN0@2100	930lbfft@1300
	NTC 290	8551NaN1	6	2700NaN0@2100	930lbfft@1300
	FORMAUL 290	8551NaN1	6	2900NaN0@1900	930lbfft@1300
	FORMAUL 290	8551NaN1	6	2700NaN0@1900	930lbfft@1300
F785T	MAXIDYNE 675	6721NaN1	6	2370NaN0@1700	906lbfft@1000
F786T	MAXIDYNE 676	6751NaN1	6	2850NaN0@1800	1080lbfft@1000
F795T	MAXIDYNE 865	8661NaN1	8	3220NaN0@2100	1100lbfft@1350
	MAXIDYNE 865C	8661NaN1	8	3170NaN0@2100	1211lbfft@1350

Chassis^[4]

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 axles rated to 18000lb. Constructed from drop-forged I-beam construction.
• Power steering is available.
• Rear axles rated to 23000lb
• Maximum GCWR 75000lb

Chassis Equipment^[5]

• 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

See also

• Mack Trucks
• List of Mack Trucks Products

Notes and References

1. Web site: Powertrain | Mack Trucks.
2. Book: Mack. Trucks. Owners Manual. 1. 1970. Mack.
3. Book: Forier . Louis C.. Motor's Truck & Diesel Repair Manual. 26. 1973. Motor. 0-910992-16-9. 1003–1004, 1107–1109, 1250.
4. Mack, Trucks, ed. (1970). Owners Manual (1 ed.). Mack
5. Mack, Trucks, ed. (1970). Owners Manual (1 ed.). Mack