Toyota Dyna

Medium duty truck manufactured by Toyota

The Toyota Dyna (トヨタ・ダイナ) is a light to medium duty cab over truck for commercial use. In the Japanese market, the Dyna is sold alongside its twin called the Toyoace. The Toyoace was a renaming of the Toyopet SKB Truck as a result of a 1956 public competition with 200,000 entries. "Dyna" is short for dynamic. The Dyna was originally available in Japan only at Toyota Diesel Store locations, then later available at Toyota Store locations, while the Toyoace twin was available at Toyopet Store locations. The Dyna was also sold as the Daihatsu Delta and the Hino Dutro. In Japan, its traditional competitors are the Isuzu Elf, the Mitsubishi Fuso Canter and the Nissan Atlas. The former Central Motors produced the Dyna Route Van from April 1957 to June 1967.

The Toyopet Route Truck RK52 was the contributing platform of the Dyna. A new Toyota Japanese dealership was established to sell the Toyopet Toyoace series SKB called Toyopet Store, which also introduced a sedan version of this platform called the Toyopet Master.

Second generation of Toyopet Route Truck, Designed by Kanto Auto Works, Ltd. The frame was shared with the Toyopet Masterline RK23 pickup truck and the Toyota Stout. The Toyopet Route Truck was renamed as the Toyota Dyna in April 1959. Although it shared the same platform as the Toyoace, its appearance is more similar to its other derivative, the Daihatsu Delta. The K20 Series Toyoace was produced until the Y10 Series arrived. It was sold as Toyota PK25 Truck for the export market.

The original semi cab over Dyna was replaced by the new model K170 series in September 1963, with a leaner design with quadruple headlights. The Dyna RK170 also provided the basis for the RK170B Toyota Light Bus, and was built on the chassis of the Stout. It also had the Stout's 1.9 litre 3R B engine. The Isuzu Elf was introduced in a diesel version in 1960, a version which proved successful enough to relegate the Dyna to second place in sales. Even the new Dyna didn't restore the Dyna's lead, until in March 1964 the J engined (2,336 cc, OHV) diesel engined JK170 was added to the lineup. A long wheelbase, version with twinned rear wheels was also available (RK175), as was a route van (glazed minivan) version.

The Dyna platform was changed to the Toyota "U" platform after the merger of Hino Motors in 1966. The engines available for this series is either a 2.0 liter model 5R gasoline engine rated at , a 3.0 liter inline four B, or the inline six 3.6 liter model H diesel. The H diesel is rated at and was only available in the heavier duty three tonne truck version, which has a top speed of The three tonne Dyna was presented in August 1969. Short (10 series) and long wheelbase trucks (15 series), as well as route vans (minibus) were available. Fitted with the 2.0 liter 5R engine rated at , the Dyna was marketed in many export markets such as Australia as well, with single or twinned rear wheels. The Toyota Coaster bus line had the same chassis and also used the U10 series chassis codes. A heavy duty version called the Toyota Massy Dyna was first introduced in September 1969.

A rebodied version of the U10 Dyna was also sold as the first generation Daihatsu Delta 1500 or 2000, depending on the weight ratio. Chassis codes are SV17 for the 12R engined Delta 1500, DV23 for the 5R petrol model (2000) and DV28 for the B engined Delta 2000 diesel. The Delta 2000 was also available with a 2.5 litre Daihatsu DG diesel engine; this carries the DV26 chassis code. In Australia, there was also a petrol inline four engine available.

This model was also sold as the Daihatsu Delta, in a range of 1.5 to 2.5 tonne payloads. The engines are Daihatsu's own 2.0 liter petrol and 2.5 liter diesel units. The second generation Delta went on sale in Australia at the end of December 1977.

The sixth generation of the Dyna was introduced on 11 May 1995. New additions to the engines included the 5.3 liter J05C directed injected diesel engine along with a four valve 4.1 liter 15B F engine. The diesel engines were designed to comply with new vehicle emissions standards. Additions to the petrol engines included a 2.7 litre four valve 3RZ FE engine as well as an LPG variant of the same engine with a code of 3RZ FP. Exterior changes included new cab designs along with redesigned electrically controlled wing mirrors, new turn signals and new thermo plastic steel steps. On the interior, new adjustable seat belts were added with a reclining angle of 31 degrees along with a new dashboard. The braking and suspension systems were improved for enhanced performance. A new cab style called the grand cab was added to the line up in addition to the standard cab which was similar to the 4.0 tonne model but had extended deck space. In 1997, a new cab style called the Super Low Cab was added to the range which features the cab ahead of the front axle. The cabin was moved forward by and the floor was lowered by for increased deck space.

The seventh generation Dyna was introduced in May 1999 and was jointly developed by Toyota and Hino. The Hino Dutro sold as a result was a rebadged Toyota Dyna. The cabins were made more aerodynamic, spacious and curved. New headlamps were installed to continue the cabin aesthetic. Interior quality as well as the dashboard were improved and made more ergonomic. The front suspension was modified and a new liquid sealed cab mount improved ride quality. The wheelbase was the longest in its class at Changes to the engine line up included the addition of a turbocharger to the 4.1 litre diesel engine.