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|  MIL-T-62531(AT)
APPENDIX A
3.4.7 Gear train.
3.4.7.1 Transmission. The transmission shall have not less than ______ forward and
one reverse gear ranges and must have a gear range capable of meeting the performance
specification. The transmission shall be provided with power takeoff openings. Net torque
capacity of the transmission shall be not less than ______ N m and net input power rating shall
be not less than ______ HP.
Rationale
Insert in the first blank space the number of forward gear ranges for the transmission, the net
torque capacity to the second space, and the net input power rating for maintenance, repair parts,
supply and other logistic support for the vehicle. Durability and reliability shall be the maximum
attainable to minimize requirements for unscheduled maintenance. Scheduled and preventative
maintenance shall be minimized, wherever practicable, through utilization of designs reducing
the number of parts requiring servicing. The transmission and auxiliary components must be
readily serviceable and have a high degree of reliability and must be able to withstand operate
abuse. The transmission should have a relatively high mechanical efficiency and be as light in
weight and as compact as is practicable.
Guidance
Insert the required transmission data in the blank spaces. Verification of the transmission
installation and proper attachment of all related components must be ascertained to assure the
performance of the transmission and to preclude transmission failure because of fluid leaks or
failure to perform due to disconnection of linkages and components.
Verification Guidance
Preparation and use of an inspection check sheet, such as a FIR, citing all the accessories,
components, adjustments and connections will provide a documented record and assurance that
proper installation has been accomplished.
3.4.7.2 Power takeoff. The power takeoff(s) shall be of ______ HP rated capacity to operate
powered equipment. Controls to the power takeoff(s) shall be located in the cab accessible to the
seated driver. A caution plate reading, "DO NOT OPERATE VEHICLE AT HIGHWAY
SPEEDS WITH POWER TAKEOFF ENGAGED", shall be provided and installed in a location
readily visible to the seated driver.
Rationale
Insert in the blank space the horsepower rated capacity of the power takeoff. Design shall
include emphasis on reducing the need for maintenance, repair parts, supply and other logistic
support for the vehicle. Durability and reliability shall be the maximum attainable to minimize
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