I have a Toro 11280XE Power Max, model 38650 with independent wheel clutches. The issue is the wheel clutches 'only work' when "both" are engaged, the unit stops moving. However when the clutches are engaged independently nothing happens, the unit continues to go forward?? I took off the back pan and examined the wheel clutch assembly and all looks good, clean (looks new) and seems to operate correctly. All PAWL/-Clutch keys seem to engage nicely into the Sprocket ASM. ..... Odd, not sure why the clutches don't work independently. ... Any advise is appreciated.