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|  MIL-W-52125B
3.18.1 Surge hopper. The surge bin hopper shall be mounted on the plate feeder, shall have
a capacity of not less than 2 cubic yards, and shall be equipped with a demountable sloping bar
grizzly.
3.18.1.1 Hopper grizzly. The demountable grizzly shall be mounted on the top of the surge
hopper. The grizzly bars shall be high-carbon, heavy-duty bars spaced to provide 3- by 12-inch
openings.
3.18.2 Reciprocating plate feeder. The reciprocating plate feeder shall have a maximum
capacity of not less than 150 tph of dry material and shall discharge material without spillage
onto a belt 24 inches wide. The feeder shall be driven by 5-hp electric motor.
3.18.2.1 Feeder mechanism. The reciprocating plate shall be supported on rollers mounted
on antifriciton bearings. The reciprocating plate, rollers, shafts, bearings, and hoppers shall be
supported by structural members and connections. All bearings shall be antifriction with
labyrinth grease and dust seals; however, the eccentric bearings may be of the babbitt type. The
plate feeder may have an adjustable stroke.
3.18.2.2 Feeder bearings. All antifriction bearings shall be in accordance with FF-B-171,
FF-B-185, or FF-B-187, type and class as applicable. Mounting of the bearings in a manner
other than securing against a shoulder shall be subject to the approval of the contracting officer
for each specific application.
3.18.2.3 Adjustable gate. The feeder shall be provided with a gate having a height-adjusting
mechanism covering the range of capacity from 50 tph to 150 tph. Changing the feeder stroke to
assist feed-rate variation is permissible, but not less than 50 percent of the feed-rate variation
shall be provided by the gate mechanism. The gate shall rise automatically to permit passage of
oversize rock and shall then return to the adjusted setting.
3.18.3 Mounting. The feeder shall be provided with four legs which shall be detachable
from the feeder for transport. When assembled for discharge onto a portable conveyor, the
height of the discharge chute shall be not less than 48 inches from the ground.
3.19 Electromagnetic interference. The electromagnetic interference emission and
susceptability characteristics of the unit shall conform to MIL-STD-461, class IIB.
3.20 Lubrication. All surfaces requiring lubrication shall be provided with a means for
lubricating.
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