1973 MACK R685RS

1973 MACK R685RS.
The Mack R series was a line of Class 8 heavy-duty trucks introduced in the early 1960s by Mack Trucks. It replaced the very successful Mack B series models. R Model production ran for 40 years until the RD model was discontinued in 2002 and the RB and Mack D series DM models were discontinued in 2005. The first R models introduced were powered by Mack Thermodyne diesel and gasoline engines. In 1973 the R cab was given a makeover to include a deeper rear wall for more room and a new dashboard design.

The company's trademark is the bulldog, which can be found on the front of almost all Mack trucks. A gold-plated bulldog indicates the truck was made with a Mack produced drive train, engine, transmission and drive axles. A chrome bulldog indicates other manufacturers' components were used.

R series
Mack started to produce the R and RW in 1966 for highway use, the RD and all wheel drive RM were for construction and municipal use. The lightweight RL model followed in 1967, the RW Superliner with a large, rectangular hood and grill in 1977, and the setback front axle RB in the 1990s.

In the 1990s the R and RW were discontinued and the RB was introduced, mostly for severe-duty applications. The hood was modified slightly for the model RB. 2004 was the last year for the RD, and 2006 for the RB.

Class 8 -
The Class 8 truck gross vehicle weight rating (GVWR) is a vehicle with a GVWR exceeding 33000 lb (14969 kg). These include tractor trailer tractors as well as single-unit dump trucks of a GVWR over 33,000 lb; such trucks typically have 3 or more axles. The typical 5-axle tractor-trailer combination, also called a "semi" or "18-wheeler", is a Class 8 vehicle. Standard trailers vary in length from 8' containers to 57' van trailers, with the most common length being the 53' trailer. Specialized trailers for oversized loads can be considerably longer. Commercial operation of a Class 8 vehicle in the United States requires either a Class-B CDL for non-combination vehicles, or a Class-A CDL for combination vehicles (tractor-trailers).

The practical gross vehicle weight limit in the USA for Class 8 trucks is determined by per-axle weight limits set by the Federal Bridge Gross Weight Formula on interstate highways. Longer 18-wheelers can weigh up to 80,000 lbs. In most states, exceptions to these limits can be made for an Oversize load but they require special permits and handling on a designated route.

Engines -
By 1916 Mack was producing 4- and 6-cylinder gasoline engines, and through 2014 continued to offer their own, in the form of three diesel V8s. Engines by other manufacturers were often optional, supplied over the years by Caterpillar, Cummins, Chrysler, Detroit Diesel, Hercules, Scania, and Waukesha.

Mack started making diesels in 1938, in 1957 the END and turbocharged ENDT 673 diesel were introduced. This 672 ci (11.0L) I6 engine family was successful, and remained in production for over 30 years.

In the early 1960s, Mack Truck's executive vice president of product and engineering, Walter May, developed the Maxidyne high-torque rise engine. The engine was introduced as an inline six in 1966, as a V8 in 1970, and as the intercooled inline six 300 series in 1973. This was an industry-changing event. The Maxidyne, with an operating range of 1200–2100 R.P.M, and later 1050–1700 R.P.M., allowed a heavy Class 8 truck to be operated with a 5 speed (Maxitorque) transmission. Previously, heavy trucks typically operated between 1800-2100R.P.M. and were equipped with 10 or more gears.

RS - Western R series, S stands for steel frame
- First R Model in New Zealand - Built 1973
- Owned since new by Britton House Movers
- Fibreglass Cab
-237hp
- 12 Speed Gearbox
- 44,000 Pound diffs
- Originally a Tractor Unit
- Used now as a Winch Truck
Gross Vehicle Mass: 25,401kg
Tare Weight: 14,470kg
Maximum Rated Towed Mass:
25,000kg braked trailer
Axle Type: 3-Axle Tandem Drive
Axles: 3
Wheelbase: 4,920

CC rating: 11,000cc 672 ci (11.0L) I6

NZ First Registration: 21-Mar-1973

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