On a BX2360, is there a way to set a limit on how far the 3-point hitch drops when I move the control lever forward?
I'm looking for a way to set a middle buster to a particular depth, so it won't dig-in too deep.
When it comes to ground engagement implements like plows, middle busters, disc's etc., the best depth control is having the implement setup correctly along w/a 3ph w/draft control. Draft control self adjusts the implements angle of attack (tip angle) to compensate for dips, rises and changes in the soils density and keeps the implement at the required depth. Even w/draft control it's not unusual to see digging implements equipped w/depth wheels to assist in keeping an implement running at the required depth.
None of the modern SCUT's (and most of the CUTs) don't have draft control so when it comes to a digging implement, theres really no 'automatic' way for the 3ph to self adjust and if one wants to set & forget a digging implement at a constant depth, about the only consistant way to do this would be w/an adjustable depth wheel attached to the the implement.
Position control and 1/4 inching valve (QIV) 3PH's are great for setting and maintaining the height of an above ground implement, such as an RC, box blade, rear blade, york rake etc., these controls can't compensate and are harder to set for digging implements. So IMHO, I don't think one can set & forget a digging implement w/these type of implements.
re. setting up a middle buster (we call 'em potato plows) on a BX. I'd start w/ the tip just slightly lower than the trailing edge then run a test row while using the QIV to try and set the depth and see if it will hold somewhat steady. Angle it down more if it doesn't dig enough and of course angle it up if it digs too deep. You'll still probably have to manually continually compensate the depth if your ground has alot of mixed density soil.
A properly setup QIV 3PH can work nearly as precise as a position control valve but theres obviously more guess work involved since theres no graduations labled for the lever. on a QIV 3PH, the lever should always remain in the neutral or centered position as this is where it "holds' the 3ph's position. If the two stops are properly adjusted, pushing the lever down to the stop then releasing it or bringing it back to center position should drop the 3ph 1/4" and hold there. several movements should drop it more, 1/4" at a time. Same goes for raising it. If the stops aren't adjusted properly, the 3ph could move more or less than a 1/4" with each lever movement. The stops are adjustable so you may have to play w/them to get them adjusted right. Some folks prefer more than 1/4" increments and adjust the stops for longer throws. The key is to return the lever to the center position so the 3PH will hold at that position. Pushing the lever past the stops allows for the 3ph to fully drop and/or raise without the 1/4" increments.
re. MMM depth control selector. This sets the height of the MMM and is not meant to control the 3PH's depth. The adjustment is actually a step cam that one of the MMM's lift arms contact to maintain the set height. The "0" position is used for mounting/dismounting the MMM and the "top" position is used to hold the MMM in the uppermost position while the 3ph is raised/lowered to work implements attached to it.
On my BX23 I usually set my MMM depth to 3.5" and when I lower the MMM to this height the lever will self return to center once the MMM rests on the step cam. I can then push the lever down and hold it to drop the 3PH down to it's lowest position, even tho the MMM doesn't drop because it's resting on the step cam. So w/the MMM mounted I can see where it may seem like the depth control knob controls the 3ph, it actually doesn't as the lever can be held down and the 3ph can lower more while the MMM stays at the set depth. Now my BX23's 3ph isn't position control nor a QIV, it's a basic up/down valve that will hold an implemet at a steady heigth once the lever is returned to center. The QIV is similar except it has a more precise lift/lower control.
Clear as mud?
Didn't mean to be so long winded but sometimes the easy questions aren't so easy to answer as theres many variables
PS, I see where MidTN suggested checkchains, which I use to hold my 3ph at a set height for my cyclone rake, and you know, even tho they won't compensate, they'll hold the hitch at a set height, good call MidTn