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Richard: First thing to check is that the Auxiliary Service Control knob is in the proper position. Because the unit lifts when not under load, it most likely is but check to see that it is pushed ALL the way in. The ASC knob is facing forward and to the right just below the seat and to the left of the 3 pt lift lever/quadrant. If you push and pull the knob a couple times, then push it all the way in,,,, and still no lift under load: Then check the Qualitrol/Position control lever. This lever is located on the right side of the differential housing a bit below and further back from the ASC knob. Lever up is Position Control, Lever Down is Qualitrol.
If there is no difference in the hydraulic lift in either position, the linkages may be out of adjustment, but more likely the hydraulic lift ram piston is in need of an O ring seal kit. Finally, you could have a frozen or leaking lift cylinder safety valve. If the valve is frozen partially open, or the sealing washer is worn, broken or not seated correctly, enough hydraulic fluid may enter the lift ram to raise the lift arms without weight, but under load the
fluid by-pass is too much to allow the unit to lift.
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