Full Technical Description

“DOSING PERC 4140 1003 27 is a slip-type yoke assembly used in driveline systems on Epiroc and Atlas Copco drilling rigs. This component forms part of a cardan or universal shaft arrangement and is designed to transmit rotational torque while allowing axial movement to compensate for frame flex, vibration, and alignment changes that occur during drilling, tramming, and compressor or pump operation. The slip function is essential in heavy-duty mining equipment where rigid shaft connections would otherwise cause excessive stress and premature failure.

The YOKE SLIP 4140 1003 27 is manufactured from high-strength alloy steel with precision-machined splines to ensure smooth power transmission and controlled axial movement under load. Its robust construction allows it to withstand shock loads, continuous vibration, dust ingress, and hydraulic oil exposure typical of underground and surface mining environments. Proper spline engagement ensures reduced backlash, stable torque transfer, and long service life in demanding operating conditions.

In operation, this slip yoke accommodates relative movement between connected rotating components such as engines, gearboxes, compressors, and hydraulic pumps. When wear develops, symptoms commonly include increased vibration, knocking noises during load changes, or uneven power transmission. Timely replacement of the yoke slip helps prevent secondary damage to universal joints, shafts, bearings, and connected drive components.

During installation, attention should be given to correct driveline phasing, spline condition, and lubrication where applicable. Mounting fasteners must be tightened to the specified torque to maintain alignment and prevent loosening under vibration. Regular inspection is recommended as part of preventive maintenance programs on drilling rigs.

Used on Machines

Atlas Copco and Epiroc COP series piston loaders including COP 1238, COP 1838, COP 1838MUX, COP 1838HD, COP 1840, COP 2160. Also used on Boomer 282, Rocket Boomer, T35 FlexiRoc, T40 SmartRoc, Atlas Copco D7, D9, M2C, L2C, F7, F9, and Simba drilling rigs.

Applications

• Driveline and cardan shaft assemblies
• Compressor and hydraulic pump drives
• Mining and tunneling drilling rigs
• Heavy-duty power transmission systems

Part Number: 4140 1003 27

Alternative SKUs: 4140100327, 4140-1003-27

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