Unloading Boat and Boat Cradle

TM-5-2090-200-12P Cradle Boat 27 FT: Bridge Erection Boat NSN 2090-00-348-8138 Manual
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TM 5-2090-200-12&P 2-5. Unloading Boat and Boat Cradle The rear winch and boom of the transporter can be used to unload the boat cradle onto a hardstand. a. Prepare the transporter for unloading. Refer to paragraphs 2-3 e and f. b. Push the boom and winch hydraulic control levers to elevate the boom cable so that the boat cradle rolls downward over the rear support inboard rollers. c. After the center of gravity passes the inboard rollers, adjust the boom elevation as needed to maintain alignment with the boat cradle and so that the bow of the boat does not contact the ground. Continue to pay out the boom cable and allow the boat cradle to descent toward the hardstand. d. Allow the end of the boat cradle to come to rest on the hardstand. Use an assistant to pay out the boom cable as needed. Release the brake and slowly move the transporter forward as the assistant pays out the boom cable, so that the transporter rolls beneath the boat cradle until the forward cradle stop pins engage the stop brackets on the rear support inboard rollers. The transporter can be pushed forward on level ground by raising the boom. e. The assistant will perform the following procedures: (1) Elevate the boom to a vertical position, adjusting the boom cable as needed. (2) Rewind the boom cable slightly, so that the dolly end of the boat cradle is raised enough to allow the stop pins to clear the stop brackets. f. Move the transporter, place the transmission in neutral, and lock the service brakes. g. Extend the boom to maximum, so that the end of the boat cradle will clear the rear support of the transporter. h. Pay out the boom cable until the dolly end of the boat cradle rests on the hardstand. Pay out enough slack so that the boom cable can be disconnected from the boat cradle. i. Lift and secure the latch hook in the unlatched position. Remove the bridge pin retainer from the latch block retaining screw. Remove the screw and latch block. j. Disengage the hook from the dolly, pull the cable and hook through the hole in the folly beam, and lift the cable off of the sheave. k. Reinstall the latch block, retaining screw, and bridge pin retainer. Release and relatch the latch hook. l. Rewind the boom cable, retract the boom, disengage the hand throttle, depress the clutch, lift the control lever to disengage the power take-off, select the proper range for the transfer case, and move the transporter to the next worksite as described in TM 9-2320-260-10. Section II. OPERATION UNDER UNSUAL CONDITIONS 2-6. Operation in Extreme Cold a. Extra care should be taken in loading, unloading, launching and retrieving the Boat Cradle in snow or icy conditions. Remove ice and snow from the Cradle before operation. b. Lubricate the cradle for cold weather conditions in accordance with LO 5-2090-200-12. 2-7. Operation in Extreme Heat Lubricate the cradle for hot weather conditions in accordance with LO 5-2090-200-12. 2-8. Operation in Salt Water Areas a. General. Operation in salt water requires special precautions due to the extremely corrosive actions that are encounter. Rust and corrosion formation are greatly accelerated in a salt water environment. The cradle should be hosed down with fresh water when removed from salt water. Signs of corrosion and bare spots in painted surfaces should be corrected and repainted as soon as practicable. b. Lubrication. Lubricate the cradle for operation in salt water in accordance with LO 5-2090-200-12. Change 2 2-16

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