I have a hydrostatic transmission, with a cold start issue. The hydrostat is a pump/motor combo with a intermediate high pressure accumulator and low pressure reservoir. The hydraulic fluid viscosity at cold temperature is acceptable (no derate), but the system pressure does not build for full operation, until after a longggg idling time. The cold start issue is at -20F ambient, even with the hydraulic oil heated to 30F. Does the reservoir air need to be preheated to maintain its charge and regain performance?.
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