M1A1 2

The 4.2-inch mortar and ammunition M1A1 cart (Fig. 220) is
desigened to carry the dismounted 4.2-inch mortar with either spare
parts and accessories or ammunition. It is a rubber-tired, two
-wheeled, man-drawn cart consisting of a chassis and a barrel rack.
when used for carrying ammunition the barrel rack is not used.

(1) The frame of the chassis is 26 inches wide and 37 inches long.
The axle is welded near the center and is fitted with motorcycle
wheels. The tires are 4.00 by 18 inches in size, with an outside
diameter of 26 inches. The cart has a tread of 33 3/4 inches and an
over-all length, including the pole, of 7 feet 3 1/2 inches.

(2) At the front end of the frame are padded pole braces to which
the detachable pole and handle fit at their junction. The pole braces
are at an angle so that besided strengthening the structure they
also act as wheel guards, deflecting any brush they encounter in
the field. they also serve as handles for lifting the cart on or off
trucks.

(3) In the center of the pull handle is a ring to which two lead chains
with handles may be attached when additional assistance is needed
in pulling the cart.

(4) A tool box is located between the pole braces at the front of the
chassis. Clips for the spade and pick-matock handle are welded to
the bottom of the chassis. On the rear of the chassis frame are
located clips for the spade, standard, base plate, and pick-mattock
handle. At the rear of the chassis is a steel tube extending the entire
width of the frame and projecting at either end to form guards for
the wheels. The tube also provides a handle for lifting the cart on or
off trucks.

(5) Tightening chains are attached near each corner of the chassis
frame for retaining the load. Theses chains are pulled taut by a
chain coupling operated by a screw.

b. Barrel Rack. The barrel rack is 40 3/8 inches long, 10 1/8 inches
wide, and 9 1/8 inches high. It is constructed to hold the barrel and
the aiming stakes. At each end are notches that hold the aiming
stakes. The rear channel has locking pins that enter holes drilled in
the aiming stakes, thus securely locking the stakes to the barrel
rack. Pins enter drilled holes in the base plate when the cart is
loaded, locating and preventing any movement of the rack on the
bottom of the barrel rack.

The disassembly and assembly described in the following
subparagraphs covers that authorized to be done by the using
organization. This disassembly and assembly is adequete to
maintain the cart under field conditions.

a. Pole Pin. To remove the pole pin (Fig.221), pull the pin from the
hole, and remove the screw at the end of the chain. This allows the
pole pin to fall free. To replace the pole pin, reverse this procedure.

b. Pull Handle. To remove the pull handl, pull the pole pin from its
hole and, with a twisting and pulling action on the handle, pull the
handle free from the cart