Lubrication Room

A-FRAME

An A-frame with seamless tubular alloy steel front legs provides ample space for the retracted dipper handle end. The rear legs are cold weather steel fabricated beams. Both front and rear legs are pin connected to lugs integral with revolving frame. The A-frame supports the boom via structural strands.

A- Frame and Front End Support Components

HOIST MACHINERY

The hoist machinery consists of a motor coupled to two gear reductions which drive the hoist drum. A spring-set, air-released disc brake is mounted to the motor. A hoist rotary encoder limits hoist travel. The hoist motor is connected to the motor pinion shaft by a multiple coupling shaft assembly.

The first reduction gear set is mounted in an oil lubricated, totally enclosed gearcase. The second reduction gears are drip lubricated with open gear lubricant from the automatic lubrication system. All shafts run on anti-friction bearings. The hoist bull gear is bolted to a spider on the left hand side of the drum.

The hoist drum is manufactured with machined, flame hardened rope grooves. Drum spider stub shafts turn on an anti-friction bearings supported by side frames which are bolted to the rotating deck.

Hoist Machinery - Plan View