Drive system having a variable output gerotor pump

A hydraulic device comprising:

• a hydraulic pump assembly hydraulically connected to a first pair of hydraulic passages and a second pair of hydraulic passages;
• a sump hydraulically connected to the second pair of hydraulic passages;
• and
• a proportional valve located between the hydraulic pump assembly and the first and second pairs of hydraulic passages, the proportional valve comprising a movable portion on which the hydraulic pump assembly rotates and a plurality of openings formed in the movable portion to interface with at least two of the passages in the first and second pairs of hydraulic passages.

A hydraulic device comprising:

• a hydraulic pump assembly disposed on a pump running surface and comprising a rotatable pump body and a support member disposed between the pump running surface and the pump body, the support member comprising a pump surface and a plurality of openings formed in and extending through the pump surface to permit fluid communication between the support member and the pump running surface;
• a first porting system in fluid communication with the pump running surface through the support member;
• and
• a sump hydraulically connected to the pump running surface by a second porting system;
• wherein the support member is movable between a plurality of positions, the plurality of positions including at least one first position where the support member permits fluid communication between the pump assembly and the first porting system through at least one of the plurality of openings and at least one second position where the support member permits fluid communication between the pump assembly and the sump through at least one of the plurality of openings and the second porting system.