TM 9-2320-364-102-322 2-29. LOAD HANDLING SYSTEM (LHS) (CONT).Engine speed must be at idle before using hydraulic selectorswitch or damage to equipment may result.NOTEHydraulic selector switch must remain in MAN TRANSwhile truck is traveling.(16)Turn hydraulic selector switch (2) to MAN TRANS.NOTEIf load locks do not engage, raise flatrack slightly andlower again. Flatrack should seat completely and engageload locks.(17)Inspect that load locks (14) are engaged and flatrack is fully loaded ontruck.