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ZF Friedrichshafen AG is a German technology manufacturing company that supplies systems, in particular transmissions for buses, passenger cars and SUVs, light commercial vehicles such as vans and light trucks, as well as all types of heavy and special vehicles. Basically there are two types of motor vehicle transmissions:
Diesel and multifuel trucks had a different model with a ”low” 1st, direct 4th, and overdrive 5th. A 2-speed transfer case engaged the front axle automatically if the rear axles slipped and moved faster than the front axle. Timken axles were used. Gas models had a 6.44:1 final drive gear ratio except for the M129 C/D, which had a 10.26:1 [6]
This capability differentiates them from traditional pumper trucks or ladder trucks designed primarily to carry firefighters and their entry gear as well as on-board water tanks, hoses and equipment for fire extinguishing and light rescue. Most rescue vehicles lack on-board water tanks and pumping gear, owing to their specialized role.
New Process Gear A833 RPO MY6 or MM7 — 4-speed longitudinal A833 overdrive transmission made by New Process Gear for early to mid 1980s General Motors Light Trucks; Muncie SM465 — 4-speed longitudinal manual used in 68- 91 Chevy 1/2 3/4 and 1 ton trucks; New Venture Gear NV1500 — 5-speed longitudinal manual made by New Venture Gear
Jargon, brand-name of early radio-frequency paging system for summoning firefighters. The Pig A blunt forcible entry tool. Pineapple Tool used to help suppress a basement fire. Pipeman The firefighter who is on the nozzle attacking the fire. Plug Slang term for a fire hydrant. This survives from the days when water mains actually had holes in ...
The 880s used a 2-speed New Process Gear NP203 transfer case. A Dana 44 4.10:1 front axle and floating Dana 60 4:10.1 rear axle completed the setup. The trucks were equipped with front disc brakes and rear drum brakes. They had a military-rated top speed of 70 mph (110 km/h). [5]
In the late 1960s the US Army needed more 5-ton (4,536 kg) 6x6 trucks. AM General developed an updated version of the M39 series, in service since 1951. The primary difference was the engine and transmission. The hood and grille were lengthened to make room for the larger engine and the lighting system was updated to meet new US safety regulations.
The safety of the M939 series of trucks has been criticized, especially braking performance and stability when loaded. In 1999 the U.S. Army began retrofitting anti-lock brake systems to the M939 trucks. [24] Until the trucks were modified, they were limited to a 40 mph (65 km/h) top speed by an Army-wide safety order. [citation needed]