MIL-T-52698A
3.7.1.1 Speed controller. The speed controller shall provide not less than two forward and two reverse speeds. The controller shall: (1) provide means to permit precision maneuvering in restricted areas, (2) provide smooth acceleration between each successive speed range, and (3) have automatic electrical or mechanical interlocks to prevent starting or reversing except through forward or reverse first speed, respectively. There shall be maximum interchangeability of parts between contractors on a given truck. Contractors shall operate on 12 volts dc or 24 volts dc and shall be replaceable. There shall be no evidence of failure in any part of the controller when the truck
is tested as specified in 4.4. When specified, the speed controller shall be the solid state type and shall provide stepless speed control in both forward and reverse directions.
3.7.2 Battery. The truck shall be furnished with industrial type battery(s) having a capacity of not less than 432 AH at 6-hour rate at 12 volts or 215 AH at the 6-hour rate at 24 volts. Battery shall meet the requirements of W-B-133.
3.7.3 Drive unit. All rotating parts shall be supported on anti-friction bearings. The drive shall be a gear reduction unit operating in a constant
oil bath. The drive gear housing shall be equipped with a magnetic drain plug and a filler plug. The motor reduction unit and drive wheel assembly shall be integrally mounted and shall revolve on antifriction bearings. The drive motor shall not fail when the truck is tested as specified in 4.3.2.
3.7.4 Hydraulic system. The hydraulic system shall consist of all hydraulic components necessary for operation of the forks and mast. Hydraulic fittings on pumps, valves, and cylinders shall be the 0-ring straight thread type as specified in SAE J514. The system shall provide for lowering of rated load at the rate specified in 3.10.3. A pipe tap or straight thread 0-ring
boss test point shall be located at the outlet of each pump or pressure inlet of each control valve for measuring pressure. All pressure hose fittings shall be 37-degree flare type female in accordance with SAE J516. The hose selected shall have a working pressure which is equal to or greater than the hydraulic system maximum relief valve setting. Pressure tube fittings shall conform to SAE J514, 37-degree two or three piece tube assembly. A system filter shall be furnished in either the suction or return line. Hose reels shall be mounted such that they are within the plan outline of the truck.
3.7.4.1 Hydraulic tubing, hoses, and fittings. All hydraulic tubing, hoses, and fittings shall meet the requirements of the applicable SAE recommended practices J514, J516, J517, J518, J524, and J525 and shall be routed to preclude kinking, chafing, and twisting.
3.8 Structure.
3.8.1. Chassis and frame. The frame and related structures shall be fabricated from structural steel and steel castings at least equal to the size and design of the supplier's standard commercial frame members and shall withstand 300 percent of rated load without permanent deformation. Frame members, bracings, and all their joints shall provide a rigid unit structure. The frame and related structure shall have sufficient depth to afford
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