In essence, this puts the tracks of the trencher into {TAIL ~ a neutral gear} and releases {HEAD ~ the forward pressure} on the cutting wheel 
In essence , this puts the tracks of the trencher into { TAIL ~ a neutral gear } and releases { HEAD ~ the forward pressure } on the cutting wheel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH