Profile: JMH maintains a complete hydraulic cylinder repair facility and is equipped to repair, rebuild or custom manufacture both double and single acting cylinders. We specialize in custom made industrial hydraulic cylinders. We stock various sizes of custom dump trailer hoists. Some of our services include honing of tubes, tightening clearance on packing glands, piston heads, polishing of shafts & tubes, true up seal surfaces, re-chrome and repair of chrome shafts.