Crowd Machinery Components

BI010977

Operators Manual

Crowd Machinery

The crowd machinery is located at the front, center of the revolving frame. It consists of a motor, spring-set, air-released disc brake, drum and gearing. A crowd limit switch prevents overtravel of the dipper handle. The entire machinery unit can be removed from the machine should maintenance or overhaul become necessary.

Crowd Machinery Components

The crowd drum drives the crowd and retract rope system. Rope grooves are machined into the drum and flame hardened. The crowd and retract ropes are attached to the drum by ferrule-becket anchors which greatly simplifies rope changes. A spring set, air released disc type brake is mounted to the RH gearcase and connected to the crowd motor using a motor coupling assembly.

Operators Manual

BI010977

Operator’s Cab

The isolated and elevated operator’s cab at the right, front of the machinery house provides a comfortable, safe and efficient working environment for the operator. Sufficient space is provided for the fully adjustable operator’s seat, a helper’s seat and the standard operator’s display panel.

The cab is sound and heat insulated with interior walls made of a sound deadening steel-plasticsteel composite. Electric powered windshield wipers are provided for quiet, dependable operation. A one-piece front window is supplied in a rugged, easy-to-change frame. Transparent sun shades are provided in front and side windows.

An air conditioner and pressurizing unit utilizes environmentally friendly 134a refrigerant in the cooling system. Interior ducting distributes the airflow to best suit the comfort of the operator.

BI010977

Operators Manual

Compressed Air System

The compressed air system consists of a rotary screw type air compressor, air receiver, air brakes, controls and center pintle air swivel. Hydraulic high pressure hose is used throughout. The air system is used to operate all machinery motion brakes and lubrication components and to perform various other functions.

Automatic Lubrication System

The lube system is located in an insulated, double wall, lube room which can be heated for cold weather operation. A one ton (907 kg) monorail-mounted electric chain hoist is provided to be used to raise supplies from the ground onto the left house platform and into the lube room. Lube points on the roller circle rollers, electric motors, suspension rope pins and some dipper pins are manually accessed. All other lube points are fed from the automatic system or by oil bath.