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The hydraulic flow to drive the water pump will be from a hydraulic <br />oil pump by the truck engine via a heavy-duty air shift power take <br />off. The water pump shall operate with an oil to water ratio of 1 to <br />1. <br />The power take off shall engage the hydraulic pump but not the <br />water pump to eliminate unnecessary high-pressure ball valve <br />bypass and water pump wear. <br />The rated design capacity of the high-pressure water pump shall be a <br />minimum of 10 GPM and 2,500 PSI. A certification by the pump <br />manufacturer for continuous duty shall be provided. <br />The unit will come equipped with an air purge system to force water <br />from the high-pressure system. Drain plugs will be provided in the <br />bottom section of the water pump for complete cold weather <br />draining. <br />The water pump shall be capable of maximum water pressure and <br />flow while achieving maximum vacuum pressure. The water pump <br />shall operate independent of vacuum system. <br />An oil to water heat exchanger will be provided in the water system <br />to cool all hydraulic fluids on the unit. <br />A monitor light shall be provided to indicate when designed flow or <br />pressure is exceeded. <br />Water pump shall have capabilities of being engaged or disengaged <br />form driving mechanism at one front control panel by turning on or <br />off an electric switch thus providing added control and safety. <br />A gravity line with on/off valve shall be mounted to truck for the <br />purpose of washing hands and equipment. It should be mounted in a <br />manner where the operator can turn valve on and wash up from <br />standing on the ground, and on the curbside of the unit. <br />Water pump will be mounted in an insulated and heated cabinet. <br />This will protect it while using unit in cold weather. <br />Hydro- <br />A smooth continuous variable flow of a minimum of 10 GPM and <br />M / NO <br />excavation <br />2,500 PSI shall be provided at the digging lance. The digging lance <br />System: <br />shall be high pressure full functioning with on/off control, <br />replaceable tips, and a relief valve set at a minimum of 2,500 PSI. <br />