I use a Hesston 540 baler which is similar to a 550 but on mine the twine arm is controlled by an electric switch and not hydraulic. On mine the monitor sounds when the bale is ready to tie and has the switch for the twine arm. I believe that on the 550 you would have a similar setup and that you need to advance the twine arm manually with your hydraulic valve.
If the baler has a bale size indicator on the left side, as you look at it, it can be used without a monitor but you will need to pay attention to the sight gauge as you bale.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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