Product Name: Coupling, Flexible Drive (Part No. 20498155)

Description:
This component is a flexible drive coupling specifically designed to connect the electric motor shaft to the hydraulic pump shaft within the hydraulic power unit of a waterjet cutting system . It is a key part of the assembly listed in Table 12-6 of the Hydraulic Power Package (20497413) .

The primary function of this flexible coupling is to transmit torque from the motor to the pump while compensating for slight misalignments (angular, parallel, and axial) between the two shafts . By using a flexible element (typically an elastomeric "spider" or similar material), it absorbs operational vibrations, dampens shock loads, and protects both the motor and pump bearings from unnecessary stress . This specific part number is designed for use with a 50HP electric motor (20498147) in a standard intensifier pump assembly .

Applications:

• Connecting the electric drive motor to the hydraulic pump in the power unit of a waterjet intensifier .

• Transmitting mechanical power to drive the hydraulic system responsible for pressurizing cutting water .

• Used in 50HP hydraulic power packages and other compatible waterjet drive assemblies .

Features:

• Flexible Connection: Accommodates minor shaft misalignment, preventing rigid stress transfer which can lead to premature bearing or shaft failure .

• Vibration Damping: The flexible insert absorbs torsional vibrations and shock loads from the motor, ensuring smooth pump operation and consistent hydraulic output .

• Torque Transmission: Efficiently transfers high torque required to drive the hydraulic pump under load .

• Easy Maintenance: Unlike rigid couplings, the flexible element can be replaced without dismounting the motor or pump in many configurations .

• Corrosion Resistance: Constructed from materials designed to withstand the harsh industrial environment typical of waterjet cutting rooms .

Maintenance:

• Failure Diagnosis: A failed flexible coupling will result in the pump shaft not turning when the motor is running, leading to zero hydraulic pressure and no cutting ability . Typically, failure is sudden and without warning signs.

• Visual Inspection: Regularly inspect the coupling for wear, cracking, or degradation of the flexible spider element. Hardening or cracks in the elastomer indicate the need for immediate replacement .

• Lockout/Tagout (Critical): Always turn off the machine, disconnect electrical power, and follow strict lockout/tagout procedures before attempting any inspection or replacement. Severe injury can result from unexpected startup .

• Pressure Relief: Ensure all pressure is relieved or blocked from both the hydraulic and high-pressure water circuits before disassembling the pump or motor mounts .

• Replacement Procedure (General): To replace the coupling, typically the motor mounting bolts are removed. The motor is slid back (or the pump is supported with wooden blocks) to separate the coupling halves and access the worn flexible element . Replace the element, realign the shafts, and retighten the motor mounts to the specified torque.

• Component Cleanliness: Keep the coupling and surrounding area free from hydraulic fluid and debris to prevent premature degradation of the flexible element .