Pto has hydraulic clutch. Its powered from the dual hydraulic pump on the side of the trans. The low pressure portion of the hydraulic pump powers the pto clutch and the optional dual power clutch. SO... could be worn out low side of hydraulic pump, should be above 120 lbs when in off and when in on position. (Book says 160lbs new). Could be the plastic or metal line that crosses over the trans, from the pump, to the pto valve at the lever. This line can break or crack... Could be the hydraulic valve at the lever that turn on and off the pto circuit. Or could be the pto clutch or support. The support is a sacrificial mount and should be replace anytime you work on the pto clutch as it as sealing rings in it to allow the flow to the pto clutch shaft, and it and the rings/mount wear out badly. the pto clutch can have a bad oring and/or worn clutch plates in the clutch pack. Worn out pumps and plastic line cracks are a bit higher on the list. But a worn pump will usually show the high pressure side 2175 lbs is usually in the 1600 lbs range or even lower after warmup. SO the 3pt lift would be very weak as well.
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