EQUIPMENT DESCRIPTION AND DATA
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES
The Enhanced Container Handling Unit (E-CHU) consists of a lift frame, stowage unit, and rear slider assembly.
These 3 main assemblies are 100% common between the M1120, M1120A2, and M1120A4 HEMTT-LHS and
M1075 and M1075A1 PLS.
The lift frame is a separate structure that is equipped with a bail bar, upper locks, lower container pins,
and a bail bar lock. The LHS on the vehicle picks up the lift frame at the bail bar and positions the lift
frame on the end of an ISO container. The upper locks and lower container pins secure the lift frame to
the container. The bail bar lock prevents the lift frame from disengaging the hook. Use of the bail bar lock
is mandatory when the lift frame is loaded on the hook.
The stowage unit is mounted on the vehicle chassis in front of the compression frame. The stowage unit
secures the lift frame on the vehicle when a container is not loaded, prevents the lift frame from interfering
with loading, carrying, and unloading a flatrack, and releases the lift frame for retrieval in preparation for
loading a container.
The rear slider assembly is mounted to the rear of the chassis and is used for supporting a container
when it is loaded, carried, and unloaded. At the rear of the slider assembly is a twistlock unit for securing
the container during transit.
The E-CHU provides an interface between the load handling system (LHS) on the HEMTT and PLS and an ISO
standard container, flatrack, or shelter having a length of 20 ft (6,058 mm), width of 8 ft (2,438 mm), and a
minimum height of 8 ft (2,438 mm) to a maximum height of 8 ft 6 in. (2,591 mm).
The E-CHU automatically guides and centers a container when loading, and is capable of engaging a container in
the following circumstances:
When container is at a 0% to 10% yaw angle relative to vehicle.
When container is at a 0% to 10% roll angle relative to vehicle.
When container is on a 0% to 10% ground slope either uphill or downhill.
When container is resting on a surface that is between 12 in. below and 5 ft above ground level. For this
purpose, ground level is defined as the plane upon which the wheels of the vehicle are resting.
When the bottom corner castings of the container are submerged up to 6 in. above the top of the casting
in mud, unpacked snow or sand.
The rear slider assembly has two configurations, container and flatrack.
In container configuration, the front slider beds and twistlock assemblies are positioned to be on the same
horizontal plane as the rear slider beds.
In flatrack configuration, the front slider beds are at an angle to the rear slider beds and on the same
horizontal plane as the truck bed. On the HEMTT only, the rear twistlocks are folded under rear slider
beds to comply with departure angle requirements.
The E-CHU kit includes Automatic Mode Sensors to adjust the loci path during loading/unloading, and Lockout
Sensors to prevent the unloading operation from proceeding if the container locks are not removed and properly
The lift frame is equipped with supporting legs (stands) enabling the frame to be positioned in a freestanding
configuration. When carrying an empty 8 ft high container, with the truck s tires inflated to highway pressure, the
overall height on both vehicles is 14 ft 2 in. (4,318 mm). To maintain the vehicle s transportability profile (for rail
and air transport), the lift frame and stowage assembly can be lowered to the truck bed. Refer to Preparation for