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MIL-T-52843C
3.11 Drive assembly. The drivetrain assembly shall consist of all
components necessary to transmit power from the engine to all four
wheels. All gears shall operate in lubricant, and a standard pressure
grease lubrication system shall be provided for other friction parts.
Gear housing shall be equipped with filler plugs and magnetic
drainplugs. Differential ring and pinion gears shall be adjustable.
Drive shafts shall be provided with a minimum of two heavy-duty
universal joints and a nonbinding slip joint. Drivetrain components
shall conform to and shall be installed in accordance with each
component manufacturer's recommendations. The,drivetrain fluid and
lubricant temperatures shall not exceed 250 F and drivetrain
universal joints shall not exceed 180 F when the forklift is tested
as specified herein.
3.11.1 Transmission. The transmission gear ratios shall be
manually selected. All transmission gears shall be constant mesh. The
transmission shall provide for shifting under full engine power
through all successive forward and reverse transmission gear ratios.
The transmission shall be protected from damage when the operator
moves or attempts to move the directional control to the opposite
direction while the forklift is in motion. The transmission shall
provide controlled application of the clutches to provide smooth
shifting, limiting slippage which could damage the clutches. The
transmission oil shall conform to MIL-T-2104, grade 10, or MIL-L-
46167. All transmission component material shall be compatible with
these oils. 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 and
torque converter fluid shall be filtered by filter(s) having
replaceable elements in accordance with the transmission
manufacturer's recommendations. The torque converter and transmission
shall absorb 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. The transmission shall be provided with a disconnect control.
The disconnect control shall simultaneously disengage the
transmission and apply the service brakes while allowing the engine
to be operated throughout the entire speed range. The forklift shall
be capable of achieving specified lifting, lowering and tilting rates
of the rated load while the disconnect control is engaged and
transmission control is in forward without moving the truck.
3.11.1.1 Hydrodynamic powershift transmission. The transmission
shall provide controlled application of the clutches mto 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
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