I don't know the specific weights but there was a reduced MTOW with the CLG retracted. There was a guarded selector switch below the landing gear lever in the cockpit that allowed the pilots to select the CLG OFF before putting the gear lever DOWN. This switch shut off the hydraulics to the CLG and rearranged the landing gear warning and indicating systems accordingly. Since this was all in the Flight Manual some airlines used this procedure to reduce landing fees at airports where full MTOW was not required on the subsequent TO. There was a Maintenance Manual procedure to lower and lock the CLG down on the ground if it was required after landing with it retracted. Also it could be retracted (by maintenance engineers) on the ground for a 2 engine ferry for example.
Douglas also offered a DC10-30 variant with the CLG removed for hot/high operations and I think Mexicana might have taken this model.