Most DC Hydraulic pump motors used on a snowplow system or dump box or the like are a series-wound type. They will run just fine on 6 volts DC source. But the speed will be much reduced. They will not overheat any more than when running on 12 Volts, even running a longer time. And that is good because the flow will be very slow. You cannot predict with certainty how much slower without information on the motor itself. The maximum pressure developed will probably not change, unless the pump runs so slow that internal leakage takes a large part of the flow. DC motors are very different than AC motors, and there are different types that further complicate things. If it was a permanent magnet motor, for instance, half the voltage would result in half the speed. But when you throw in a series field you get something different. All that being said, if you are going to be below zero degrees F; I would suggest using a Synthetic fluid in the system instead of ATF. Lubriplate Low-pour or Shell Aero; or the Fisher Blue stuff is good. Not cheap, though.
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