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Open comparison →Written guides on choosing tractors, hydraulics, PTO, hitches, and maintenance.
Read articles →An owner documenting their first hay cut of the season with an RK37 and sickle bar mower. The most useful stretch covers a mid-job belt-slippage fix, exactly which adjustment bolt to use, how to tighten it, and what socket sizes fit. It also shares hard-won tips on cutting-bar angle and PTO RPM. Best for RK37 owners troubleshooting a sickle bar mower, not a buying-decision video.
An owner-operator sharing real-time homestead work, so expect candid trial-and-error rather than polished instruction.
There is an adjustment bolt beside the drive wheel with two nuts. Back off one nut, tighten the other until the belt is tight, then snug the first nut back against it to prevent backing out.
A three-quarter inch socket works for the bottom nut, but the top nut needs a deep socket or a wrench since a shallow socket cannot reach it.
The cutting bar should tip down just a little, if anything. It should not tip up or it will clog and require stopping to unclog the blades.
The owner ran around 500 RPM on the PTO, noting the RPMs need to be high enough for the mower to run smoothly without jumping.