Dennis Trident 3

Dennis Trident 3
KMB's 12m Trident 3 (ATR7) with Alexander ALX500 body.
Overview
Manufacturer	Dennis /TransBus International (badged as Dennis)
Assembly	Guildford, England
Body and chassis
Doors	1 or 2
Floor type	Low floor
Powertrain
Engine	Cummins M11/ISM/ISMe
Power output	305hp/330hp/335hp
Transmission	Voith/ZF
Dimensions
Length	10.3m, 10.6m, 11.3m or 12.0m
Width	2.5 metres
Height	4.17m or 4.4m
Chronology
Predecessor	Dennis Dragon
Successor	Alexander Dennis Enviro500

Dennis Trident 3 (marketed as 3-axle Dennis Trident), is the first low floor tri-axle double-decker bus chassis built by Dennis in the United Kingdom, with a large number purchased by bus companies in Hong Kong, Singapore, the United States and Canada.

The Trident 3 chassis was developed from Dennis Lance/Arrow. It had a longitudinally-mounted rear engine, with a radiator mounted on the right hand side of the engine. An auxiliary axle was mounted behind the second axle to cope with the weight at the rear and reduce the rear overhang.

Trident 3 was available in 4 different body lengths: 10.3m, 10.6m, 11.3m and 12m. It could be fitted with Alexander ALX500 or Duple Metsec DM5000 bodywork with either a closed top or an open top.

The engines used for these double-decker buses were all manufactured by Cummins. Earlier models use the M11-305E, a 305 hp engine which complies with Euro II standards, or an ISM-330 330 hp engine for the buses delivered to North America.

The M11-305E engine was replaced by the Cummins ISMe Euro III-standard engine in 2001. A 330 hp version (the ISMe330) was used initially, but later models in Hong Kong adopted a 335 hp (ISMe335) version.

Initially the options of gearbox included Voith DIWA863.3 and ZF 5HP590. Later Voith DIWA864.4 and DIWA864.3 gearbox were also chosen, but both were replaced by Voith DIWA864.3E gearbox.

For Euro III-engined Tridents, almost all of them were fitted with Voith DIWA864.3E gearbox, only 10 were fitted with ZF 5HP602 gearbox.