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A Run Flat mode checks tire pressures regularly and inflates as needed to compensate for leaks. [3] [12] The A1 model features uprated AxleTech 5000 Series axles, an anti-lock braking system with traction control and a Dana central tire inflation system. Armor mode increases tire pressures to compensate for the added weight of the B-kit armor.
A size 55/80R63 radial tire was developed by Michelin in conjunction with Caterpillar specifically for the first generation 797. [16] The Caterpillar 797B and 797F run 4.028 m (13.22 ft) tall, 5,300 kg (11,680 lb) Michelin 59/80R63 XDR.
As a wrecker the boom could lift up to 20,000 lb (9,100 kg), and had a longer reach than the M816. As a tractor the fifth wheel load rating was 15,000 lb (6,800 kg). Because of the high empty weight as a semi tractor, oversize 12.00x20 tires were used, this was the only model to have this size. [3] [19]
The M939 series uses 11:00 R20 tires with two tires per side per axle in the rear (rear tandem duals). This allows a heavy load to be carried on improved roads and most US trucks in the past have used them. The M939A1 and M939A2 series instead use oversized 14:00 R20 tires with a single tire on each side per axle, still with a tandem setup.
Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [24] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
The tractor's engine was a new design and, for the time, offered excellent performance for its displacement. Its main transmission, basically a carryover from the D19, had 4 forward and 1 reverse gear and was not synchronized. The 190XT had a power director like the D Series, but it could smoothly shift on the go just like the D series. The ...