Abstract: A square baler includes a compression chamber, a reciprocating plunger configured to compress bale material in the compression chamber to make a square bale, and a feeding system configured to feed bale material into the compression chamber. The feeding system includes a feeding duct having an input end and an output end, a feeding fork configured to perform a loading stroke to pre-compress bale material in the feeding duct and a feeding stroke to transfer bale material from the feeding duct into the compression chamber. A drive mechanism is provided for driving movement of the feeding fork. The drive mechanism is adjustable to control the length and/or the speed of the loading stroke.