... rig structure is compact, highly containerized, and space saving. Self-propelled Workover RigBasing on advanced technology home and abroad, adopting Caterpillar ... main power, HPMM have designed and manufactured series of self-propelled workover rigs by ourselves. The diesel engine and the ... the heavy-duty and self-propelled chassis of 8×6, 10×8, 12×8, 14×8, 14×12, 16×12 and hydraulic steering system ...