Pump coupling, segmented H type 30H, aftermarket

Pump coupling, segmented H type 30H is an aftermarket part for the construction machinery with hydraulic pumps.

The H-type pump coupling is the flexible element that transmits torque from the engine flywheel to the hydraulic pump shaft. Its ring of aluminium bushes and polyurethane (yellow) segments absorbs engine vibration and shock and accommodates small misalignment between the two shafts. Over time the segments harden, crack or crush; a worn coupling knocks in operation, loads the pump shaft and bearings and in the worst case breaks, leaving the machine with no hydraulic power. Thanks to its segmented design, the element can be inspected without removing the pump.

Specifications

Compatibility

According to the product card, this is a size 30H (H series) pump coupling, chosen by the number of bolt holes and their pitch circle diameter. Other parts are in Hydraulic pumps.

Fitting

For the change, separate the pump from the engine and check the hubs on the flywheel and pump shaft and the bolt holes. Fit the element, tighten the bolts with thread locker to the specified torque, and keep the misalignment between pump and engine within the maker's limits. After assembly, run the engine at idle and check for knocking and vibration. Always inspect the coupling element whenever the pump is separated from the engine.