The hydraulic lift cover mechanism is influenced by the operator using the draft & position control levers, an implements pulling or pushing force on the toggle spring & the upward or downward movement of the lift cover arms. ( HD ) ED 135 948 CE 009 541 Agricultural Sales and Services. It either pumps oil or dumps oil or both through the control valve. Draft control sensitivity demonstrated by the ease with which one can lift a plough by hand effort alone. The hydraulic system is influenced by the mechanics of the lift cover. The oil in the ram cylinder returns through the same standpipe & dumps. When the operator places the lever in the down position the lift covers mechanism closes the pumps control valve and the pumps pressure is dumped back into the diff housing. Be sure to tell the exact difference between pressure/draft control, position control, depth control and reaction control. I think the last time I plowed with my MF-135, I used a combination of position and draft. It can save having to shift gears going from sticky to nice dirt. When oil enters the ram cylinder it forces the piston forward and the arms are raised. The draft control keeps the load on the tractor more constant as you pass through different soils. The oil flows up through the standpipe between the pump & lift cover. Four pistons moving back & forth suck oil in through the chambers and push it out through the same chamber outlet valves. When the tractors engine is running the hydraulic pump operates continuosly getting its drive from the transmission PTO output shaft.
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