MACHINE HYDRAULIC LAYOUT

Traction Drive System

Delta SBD 30MB3 Maintenance Manual

Traction Assembly

The traction drive system provides the necessary mobility for the 30MB3 miner to mine coal and to tram from place to place as needed. It includes:

Independent RH and LH drive systems, each consisting of a water-cooled 55 kW DC variablespeed electric motor mounted to a drive gear case that powers drive sprockets to provide motion to the respective RH or LH crawler chain. A forward-mounted crawler chain idler roller on each side which is equipped with a greasepowered piston to adjust the crawler chain to its proper tension; once adjusted by movement of the grease, the idler roller is locked into position by a necessary number of shims, and pressure in the grease piston is relieved. An AC/DC solid-state electronic drive logic system which provides the operator with three speed ranges:

(a) High speed which moves the miner at a rate of 26 metres/min, used mainly for flitting from one working face to another. (b) Intermediate speed at a rate of 13 metres/min, used mainly for rapid re-positioning of the miner within the face area. (c) Sump speed, fully adjustable by the operator to a preset value ranging from 0 to 10 metres/min for sumping the miner into the coal face. The adjustable sump speed setting allows the operator to select an optimum cutting speed when face hardness conditions vary, eg. Rock inclusions or roof/floor cutting.

Delta SBD 30MB3 Maintenance Manual

The traction drive control system provides the operator with the capability to run either RH or LH crawler chain in forward or reverse independently for maximum manoeuvrability, i.e. the miner may be pivoted about its central vertical axis. The RH and LH drive trains are each equipped with fully enclosed multiple-disc fail-safe hydraulic flushed parking brakes that are spring-applied and hydraulically released.

The crawler chains are manufactured from high-alloy wear-resistant steel for maximum life, and are equipped with grouser ridges to enhance traction in both soft and hard floor conditions.