... Reliable & long life 4 Convenient operation and maintenanc API M Front-mounted pumping unit adopts crank-balance. The special structure reduces horsehead ... standards. Performance and advantage1)The gear reducer lies at the front of samson post. Impact structure, convenient operation and maintenance, longer ... ,0009M-160D-173-8617,30086,72,58160,000 API M Front-mounted pumping unit