MIL-T-14537 Truck, Lift, Wheel

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MIL-T-14537G

floor level (Floor level is defined as that plane upon which the casters rest. ) The

vertical distance, through which the lifting arms shall move the load from the floor

level, shall not be less than 4.25 inches. The lifting arms shall be designed to

facilitate freely rotating and positioning a wheel assembly prior to and during

assembly to vehicle. Means shall also be provided to rotate individual and dual

wheel assembly for correct alignment to splines and mounting bolts of vehicle axle.

The lifting arms shall incorporate needle or roller bearings to facilitate easy

rotation of each wheel of a dual wheel assembly as well as the entire dual wheel

assembly.

3.6.4 Lifting mechanism. The wheel lift truck shall incorporate a manually

operated mechanical or hydraulic lifting device, located at the rear of the lift,

and shall be actuated by a lever or handwheel which shall be accessible to the

operator. The actuating device shall be so located, and its operation shall be

such, that the resulting action of the lift is not hazardous to the operator. The

lifting mechanism shall possess a mechanical advantage which requires a physical

force of not more than 50 lbs to raise and lower the lifting arms in the manner

specified in 3.5.1, while loaded to the capacity as specified in 3.5.2. Unless

otherwise specified (see 6.2.1), the lifting mechanism shall be either a mechanical

or hydraulic operated unit at manufacturer's option. The lifting mechanism shall be

capable of raising, lowering, and retaining a 1875 pound bad as specified in 3.5.1

at any height within the range specified herein. When loaded as specified in 3.5.1,

to a capacity of 1875 lbs, the wheel lift truck shall be capable of withstanding

10 complete lifting and lowering cycles without damage or without permanent

deformation with the exception of the wheel lifting supports which shall not deform

permanently more than 0.03 inch in any direction at the support extremities.

3.6.4.1 Hydraulic lifting device. If a hydraulic mechanism is provided, it shall

be capable of maintaining the load capacity (1875 lbs) specified in 3.5.1 and 3.5.2

at heights within the specified range for a period of not less than 30 minutes

without leakage or a change in the height position in excess of 0.125 inch. The

height position change shall not exceed 0.021 inch for any five-minute interval.

The hydraulic unit shall consist essentially of a power ram, pump reservoir, and

valves. The reservoir shall be fitted with a filler plug or plugs.

3.6.4.1.1 Hydraulic fluid. Only hydraulic fluid conforming to MIL-F-17111 or

MIL-H-6083 shall be provided in each jack. The seals of the jack's hydraulic unit

shall be compatible with the hydraulic fluid chosen and used in the jack.

3.6.4.1.2 Valves. The hydraulic unit shall incorporate a control (release)

valve. The release valve shall permit lowering and stopping of the lifting arms at

any position along the descent and be controllable to a rate of descent of one inch

per minute. The release valve shall be mounted at a protected location or provided

with a locking device to prevent accidental lowering of the lifting arms. The

release valve shall be accessible and so located that the lowering of the lift shall

not be hazardous to the operator.

3.6.5 Wheel retaining device. The wheel lift truck shall incorporate a wheel

retaining device. The wheel retaining device shall be capable of securely holding

the wheel and tire assemblies in an upright position and prevent the wheel and tire

assembly from falling off the wheel lift truck during its functions as specified in

3.5.

3.7 Painting. Unless otherwise specified (see 6.2.1), painting and finishing of

the wheel lift truck shall be in accordance with the contractor's commercial

practice provided the following minimum criteria are met or exceeded: all surfaces