CAT Bucyrus 25M3 MAINTENANCE MANUAL BI619315 – PDF DOWNLOAD

Technical Manual

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25M3 MAINTENANCE MANUAL SECTION 1

MACHINE DESCRIPTION

Helensburgh 25M3 Maintenance Manual

GENERAL DESCRIPTION

The Bucyrus 25M3 is an electrically powered, radio remote controlled drum type continuous miner. Overall the miner is 12 metres long and 3.5 metres in the width of the body. The miner has a cutting width of 3.7 metres and is capable of mining seams from 1800 mm to 3500 mm thick.

The machine is mounted on crawler tracks that provide full mobility and sharp turning radius in both board and pillar and long wall development mining plans. The ranging cutting head mines material from the solid face using a chainless rotating drum, and a CLA-type gathering head with high speed conveyor efficiently moves mined material to a haulage system behind the miner.

The machine's weight and balance is designed to mine most efficiently by sumping into the face at the top and ripping material to the bottom or top of the seam.

The figure below shows a general arrangement of major mechanical components. A brief description of the various major sub-systems of the 25M3 follows.

Machine Layout

Brakes Oil Flushed Spring Applied Park Brake

NOTE: Dimensions are valid for machines not fitted with a lift kit. A lift kit will add 75 mm to all height dimensions.

NOTE: All motors are water cooled.

Helensburgh 25M3 Maintenance Manual

COMPONENT DESCRIPTIONS

Main Chassis

The main chassis of the machine is a robust box-type structure of high-strength steel construction that provides the following:

Mounting of the RH and LH crawler tracks and their independent drive systems and take-up provisions as follows:-

Independent pivots for mounting the cutting head and gathering head and conveyor components and their associated hydraulic cylinders for articulation.

An integral hydraulic oil tank along with one electric motor/hydraulic pump assembly and associated valves and piping.

A rear stabiliser and with two articulating hydraulic cylinders for improving leverage forces during shear-down in the cutting sequence.

Mounting provisions for all major electrical system components and their associated wiring.

Cutting Head Assembly

The cutting head assembly is attached to the main chassis at RH and LH independent pivot points around which the assembly is articulated for vertical-ranging cutting of the coal seam.

The independent pivots allow removal of the cutting head assembly without disturbing the gathering head or conveyor components.

The left and right hand gear drives are connected together at the cutting head by the main drive shaft. This arrangement allows the power of both motors to be available at any point along the cutting head.

Helensburgh 25M3 Maintenance Manual

Gathering Head Assembly

The gathering head assembly is attached to the main chassis at RH and LH independent pivot points around which the assembly is articulated to adjust the gathering head for uneven floor conditions and for tramming the miner from place to place. The independent pivots allow removal of the gathering head assembly without disturbing the cutting head or discharge conveyor.

Conveyor Assembly

The conveyor assembly is attached to the main chassis at RH and LH independent pivot points around which the assembly is articulated vertically to assist in optimum loading into the haulage vehicle. Independent pivots allow removal of the conveyor assembly without disturbing the cutting head or gathering head components.

Helensburgh 25M3 Maintenance Manual

Traction Drive System

The traction drive system provides the necessary mobility for the 25M3 miner to mine coal and to tram from place to place as needed. The traction speeds are infinitely variable from 0 to 22 metres per minute. Speeds 1 to 3 are used for tramming and when the cutters are running the miner reverts to Sump speed which is set to a percentage of speed 1.

The drive train originates at the two traction motors located inside the crawlers on either side of the machine. Power is then passed forward to a gear transmission driving the planetary gear cases, which then drives the 20” crawler tracks.

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.

Bucyrus Australia

Hydraulic System

The machine hydraulics are operated by one two-stage, fixed displacement gear pump. One stage supplies 121 L/Min @ 3500 psi to the cylinder functions and the other section supplies 15 L/Min @ 600 psi to the pilot functions.

The main hydraulic reservoir is designed and constructed within the main frame and has a total oil capacity of 304 Litres. In addition to the main reservoir the 25M3 miners use a header tank with a capacity of 83 Litres located on the scrubber side of the machine.

Helensburgh 25M3 Maintenance Manual

Water System

The water distribution system on the 25M3 miner serves several purposes:

(a) It is circulated through the electric motors for the hydraulic pumps, cutting head, gathering head and traction system, the main control case and traction transformer case, to provide cooling. This is at inlet pressure only and is discharged through sprays under the cutter head.

(b) It feeds water sprays around the cutting head, scrubber, gathering head and conveyor to help control and contain dusty air.

Helensburgh 25M3 Maintenance Manual

Piloted Operated Check Valves

Flow Control Valves

Bypass Control Valves

Cutter Head Outlet Hose

Scrubber Outlet Hose

Main Inlet Pressure Hose

Motor Cooling Outlet Hose

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• Thank you very much for reading the preview of the manual.

• You can download the complete manual from: www.heydownloads.com by clicking the link below

• Please note: If there is no response to CLICKING the link, please download this PDF first and then click on it.