Working principle of tractor drawn semi-mounted or mounted type mower

• operated by PTO shaft.
• In this case, the cutting mechanism is driven independently of the forward speed of the mower.
• A shaft is connected with the PTO shaft which drives a pulley with the help of universal joint.
• This V pulley rotates another smaller pulley on the crankshaft of the machine and reciprocating motion is transmitted to the cutter bar.

Alignment of Mower

• In correct operating position, the crank pin, knife head and the outer end of the knife should be in a straight line.
• This line should be at right angle to the direction of travel of mower.
• When the cutter bar is properly aligned, the knife and the pitman run in a straight line.

Registration of Mower

• A mower knife is said to be in proper Registration when the knife section stops in the center of its guard on every stroke.
• Adjustment is commonly made by moving the entire cutter bar in or out with respect to the pitman.
• If mower is not well registered, there is unbalanced load, uneven harvesting and excessive clogging of crops on the knife.