Abstract: A drive coupling, as between an engine and a pump, facilitating assembly of the pump to the engine and preparation of the engine-pump combination for operation. Elements of the coupling include a relatively projecting externally splined shaft associated with the pump and an internally splined hub associated with the engine, the two being brought to a telescoping, interfitting relation as an inherent part of an action properly relating the pump to the engine. A shaft support assembly provides for a temporary fixing of the shaft against off center movements while it is being introduced into the hub. The hub is made a part of a separable coupling plate assembly fastened directly to the engine flywheel preparatory to a coupling of the pump to the engine. The splined connection within the hub is lubricated according to a concept substantially precluding loss of lubricant during operation of the drive coupling but providing for escape of lubricant supplied in excess of that required.