Abstract: A hand-held device for packing grease into wheel bearings including a housing having a grease inlet, a spring-biased piston and a cap closing off the bottom of the housing. The cap and piston are adapted to maintain a wheel bearing to be greased in a fixed position in the housing. Ports in the piston cooperate with the grease inlet for introducing grease under pressure above a bearing positioned in the housing for greasing the same. The cap is separable from the housing so that, after greasing the bearing, the cap may be removed and the bearing quickly and easily located. An opening may be provided in the cap for evacuating excess grease out of the housing and an adapter may be provided for quickly and easily cleaning the interior of the device.