MIL-T-52864D
3.9.4 Hose reels. When hydraulic hose reels are used on the mast to maintain hose tension during mast extension, sheave wheels, guide rollers, guide blocks, or other means shall be provided to prevent the hose from becoming entangled around and riding over the reels or reel flanges. Hose reels shall be mounted such that they are within the plan outline of the truck for all positions of the forks.
3.10 Uprights and carriage assembly. Uprights shall be of the telescopic, roller type. The drive tires shall not interfere with the carriage assembly travel at any height or upright tilt angle. Chains shall be installed in such a manner that they cannot be displaced from the roller until they have been raised a minimum of 1/2 the chain side plate height. Crossmembers of the mast structure, when in a lowered position, shall not interfere with the operator's horizontal line of sight, ±10 degrees, to the front of the truck. Without leaving the seat, the operator shall be able to see the tip of at least one fork at any lift height when there is no load on the forks. Means shall be provided in the uprights to compensate by replacement or adjustment for wear which may develop between lateral rolling contacts. Positive means shall be provided to prevent overtravel of the carriage or channel in both upper and lower positions. Carriages shall be supplied with adjustable thrust bearings to resist thrust introduced by off center loading. Chains used in the lifting mechanism shall have a factor of safety of not less than 4.7 to 1 based on average ultimate strength. When nuclear safety is specified (see 6.2), load securing rings or eyes shall be provided on both left and right sides of carriage and located not more than 12 inches from top of carriage assembly. Safety factor for load securing devices shall be not less than 2.25 to 1,
based on yield strength, assuming that each device is loaded equally. Ring or eye openings shall be determined using MIL-STD-209. The load securing device, when not in use, shall not extend forward of any surface on front face of carriage. The carriage assembly/load securing device combination shall be capable of withstanding a horizontal force (at load securing devices) equal to the truck capacity without failure or permanent deformation of carriage assembly. Direction of force is forward. The mast shall have two lift cylinders, each located in the middle of the mast, except a free lift cylinder no higher than the top of the fork carriage is acceptable. Any hydraulic
hoses or chains located within this open area shall be located away from the center of the mast.
3.10.1 Forks. Forks shall conform to ASME B56.1 and the applicable specification sheet. The fork spacing detailed on the specification sheets shall be measured from the outside to outside surfaces of the forks. Fork thickness shall not exceed 1/2 inch at the tips and the end taper shall be not less than 14 inches long. Taper shall be on the underside of the forks. The top of the fork tips shall be chamfered or rounded to break corners and
provide smooth edges.
3.10.2 Fork positioner. Hydraulic powered fork positioners shall be furnished. Fork spacing shall be simultaneously hydraulically adjustable within the dimensions specified on the applicable specification sheet. The dimensions shall be measured from the outer edges of the forks.
3.10.3 Side shift. The truck shall be equipped with a hydraulically
powered side-shift mechanism. The side-shift mechanism shall side shift rated load a minimum of 6 inches each side of center (12 inches total travel).
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