ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-1(2)Command: Locks out.CAUTIONPersonnel are advised to use extreme caution during locking and unlocking of rollers. Once therollers are locked or unlocked, move hands and arms from between the bridge and adjustablesupports. Do not put hands or arms into that area more than necessary. Failure to stay alert whileoperating locks can result in injury.(3)Action: Personnel. Personnel on CRB roller locks will use the 19 mm ratchet wrench to operate bothrollers on each rocking roller to the full up position. When both rollers are up, both of the moveablebearing pads on each rocking roller will be pulled to the full out position, CRB personnel will report to theNCOIC that the CRB is ’unlocked’ once report is received, NCOIC, roller lock (FRB/RRB) personnel, andvehicle driver will follow steps a. (1) through (8) to unlock rollers and boom bridge to desired panel point.(4)Command: Locks in.(5)Action: NCOIC, roller lock (FRB/RRB) personnel, and vehicle operator will follow step a. (10) to lockrollers.(6)Action: Personnel. After the FRB/RRB are locked, the personnel on the CRB rollers will push bothmoveable bearing pads to the full in position. When both moveable bearing pads are in, the 19 mmratchet wrench will be used to operate both rollers on each rocking roller to the full down position, CRBpersonnel will report to the NCOIC that the CRB is ’locked’.(7)NCOIC. NCOIC will direct crews back to other duties.4-20.JACKINGAfter launching, it is necessary to lower the bridge down from the roller beam. Before disassembly, the bridge hasto be raised onto the roller beams. This is achieved by jacking, using a crane (para. 4-22) or davits (para. 4-21).a.General PrinciplesJacking down both ends of bridge together to save time is NOT allowed. The sequence to be followed isALWAYS:(1)Lower far end of bridge using jack in the landing roller pedestal (single story over 8 bays and all doublestory) or jack, jack post and packing (single story up to 8 bays).(2)Transfer weight of bridge from roller beam to two jacks on home bankseat beam.(3)Jack onto packing when second or third stage jacking is necessary.These general principles apply in the reverse when jacking up during disassembly.WARNINGNever jack at one end of a bridge unless the other end Is fixed on locked rollers, on the ground, orsecured to vehicle when on the capsill or forward roller beams.Always ensure that head of jack Is Inserted correctly In jack hood and does not rest on edge orrim.Never use Inner central bracket on bankseat beam for jacking up or down. Outer central bracketcan only be used on single story bridges up to 5 bays.4-71
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