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B-81 Mack Tractor with Crane

B-81 Mack Tractor with Crane

Here is a Mack B-81 I built for the marine contractor on my layout It has a crane mounted behind the cab for loading piling and other heavy timber onto its trailer or another truck. Behind this is a fifth wheel with enough clearance for full turn of a square nose flat trailer with a 24” set back king pin. All the way back is a full width reinforced bumper for two purposes: first to allow for the front of an oil field type flat trailer to be winched up and then onto the ramp guides to the fifth wheel and second, to assist in anchoring the truck when using the large drag winch to pull boats out of the water and onto the land.
There is a heavy pipe front bumper rather than the stock Mack one that comes with the B-81s. This is also for anchoring the truck when pulling with the winch or lashing the truck down to the barge it occasionally works off of.
The fuel tanks were scratch built from styrene tubes with steps added, the side ladder type steps are from various etched brass parts from old kits. There’s a styrene tool box on the right side and the platforms where the crane or winch operator stands have gray non slip pads painted on (decals).
The crane swings and elevates bit does not extend because the cable must be glued to the sheaves on the end. The six mud flaps are made of 0.010” thick black Evergreen Scale styrene.
The trailer that was designed and custom built for this truck is 48 feet long overall with an eleven foot long front deck and a 36 foot lower level which is 39” off the ground. Both decks are wood planking between the steel framework. Of course it’s only 8’-0” wide because it was built back in the days when that was the legal width. The side sills are extend all the way to the rear so loads can be blocked over the tires. There are eight pockets for removable stakes to keep piling and timber from falling over the sides and a headboard to keep the load from shifting forward but allowing the winch cable from the tractor to pass through so it can assist in loading if necessary.
For more detailed photos please go to the web site and search for s/n 102115 for the truck or 102125 for the trailer. You can also search for “B-81”

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