The NORSEMAN hydraulic motor is a unique design involving a rotating case and stationary cylinder block. The radial pistons and internal cam provide a multi stroke operation with an exceptionally high output torque in relation to its size.
The special cam profile provides a constant displacement leading to a constant output torque.
The 32 Series motor allows an option of full or half displacement by means of a special two-speed valve mounted on the motor.
High pressure in "A " and "B"
Charge pressure in "C"
Half the number of the pistons are always in a working stroke, fed by high pressure from the pump. The remaining group of pistons is in a retracting stroke, feeding oil out from the motor and back to the pump.
High pressure in "A"
Charge pressure in "B" and "C"
25% of the pistons are working here, forcing the cam ring to rotate. 50% of the pistons are on the return stroke, feeding oil back to the pump, but also supplying oil to the remaining 25% of the pistons, now idling. Hence the motor is operating with half its normal rated displacement and thus performing at twice the normal speed and half the normal torque compared to full displacement operation.
Disengagement can be achieved in two different ways:
In the RE-CIRCULATION mode all motorports are connected to charge pressure. The motor can rotate freely within the rated speed.
In the FREE-WHEELING mode all the main connections of the motor are connected to the drain line. The pistons are forced to their inner position by the case pressure and the motor casing rotates freely.