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Hydrodynamic powershift transmission. |
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|  MIL-C-53057(ME)
tested as specified herein. The axle manufacturer's rating for torque
input, gearing and beam loading shall be equal to or exceed the
actual maximum loads imposed under all operating conditions.
3.11.1 Transmission. The crane shall be provided with a
hydrodynamic power shift transmission as defined in SAE J645. The
crane shall be capable of accel rating from a standstill to maximum
e
speed under continuous full engine throttle on level ground and this
shall be accomplished without damaging the transmission. The
transmission shall be protected from damage when the operator moves
or attempts to move the directional control to the opposite direction
while the crane is in motion. The transmission oil shall conform to
MIL-L-2104, Grade 10, or MIL-L-46167. The fill tube shall be
functionally labeled. All transmission component material shall be
compatible with these oils. The transmission fluid shall be filtered
by filter(s) having replaceable elements in accordance with the
transmission manufacturer's recommendations. The transmission
controls shall include a disconnect valve.
3.11.1.1 Hydrodynamic powershift transmission. The transmission
shall provide controlled application of the clutches to provide
smooth shifting, limiting slippage which would damage the clutches.
All transmission gears shall be constant mesh. Oil pressure for
actuation of the transmission clutches, for torque converter supply,
and for transmission lubrication shall be supplied by a mechanically
driven pump. The transmission shall be capable of withstanding
maximum stall operation for a minimum of 30 seconds without damage or
permanent deformation and without exceeding the fluid temperature
limit of 250 F with an initial fluid temperature of not less than
157 F in an ambient temperature of not lower than 25 F.
3.11.2 Rear axle oscillation. The rear axle shall oscillate freely
such that the total vertical travel of each rear wheel shall be a
minimum of 12 inches (six inches above and six inches below the
horizontal axle centerline.)
3.12 Hydraulic system. The hydraulic system shall consist of all
fluidpower components necessary for the operation of the crane,
including the steering system but does not include the brakes or the
hydrodynamic type power train. The hydraulic system shall provide for
a simultaneous swing and load hoist. All filler tubes shall be
labeled. The working hydraulic system (boom lift, winches, boom
extension, slewing and steering) maximum operating pressure (relief
valve setting) shall not exceed 3000 psi. The system fluid shall
conform to MIL-L-2104, Grade 10 or MIL-L-46167. All hydraulic system
component material shall be compatible with these fluids. The
temperature of the hydraulic fluid shall not exceed 100 F above the
ambient during all operations and tests specified herein. Hydraulic
fittings on pumps, valves and cylinders shall be either the O ring,
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straight thread type or 37 degree flare swivel type, as specified in
SAE J514 or the 4-bolt flange type as specified in SAE J518. When
37 degree flare fittings are used on a hydraulic line, the mating
connection on the components shall also be a 37 degree flare type.
The hydraulic system shall be flushed free of foreign matter
including weld slag and spatter. The connection ports of the
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