SINOCMP Focuses On Serving you wholeheartedly. Valve Body and Throttle Body. Part Name: Hydraulic Pump Ass'y. For Komatsu Dump Trucks HM250-2 HM300-2. We will be happy to resolve any issues you may have in cordial and friendly manner.We will reply every message and solve the problem within 24 hours(except holiday). Feedback is very important to us.