Model HDK4 introduced in 1959.br/br/AEC AVT1100 6-cyl 340bhp diesel enginebr/Borg amp; Beck clutchbr/3-stage hydraulic torque converterbr/3-speed gearboxbr/Kirkstall double reduction rear axlebr/Semi-elliptic springsbr/Left hand steering with hydraulic power assistancebr/18 cu yd quarry body (23½ cu yd heaped)br/Edbro B amp; E twin ram 3-stage tipping gearbr/25 tons payloadbr/br/lt;igt;AEC neg 25714lt;/igt; (NF)