Abstract: The current invention is to an arrangement for a portable emergency drum jumper that can be mounted to the mixer fender or mixer fender of a truck to provide emergency power to rotate the drum. The pump has been substantially reduced in size by rotating the drum at a reduced speed sufficient to mix in a retarder or water that will prevent the concrete for setting up to 24 hours to provide time to unload the concrete from the drum. Instead of attempting to duplicate the power and drum rotation rate of 12-14 rpm of a fully operational truck, the emergency drum jumper operates at a slower rate such as 2 rpm which is sufficient to mix the retarder or water fully into the concrete and to allow unloading of the concrete. While the higher speed of the fully operational truck allows for expedited on-site mixing of the concrete for a particular job, the lower speed of the emergency hydraulic pump of the current invention provides a fully capable system in a portable system which can be easily delivered on site.