MIL-C-53057(ME)
controlled by the same steering wheel or a tiller. The effort
required to turn the steering wheel shall not exceed 10 pounds pull
at the rim. The steering wheel shall require not more than 6 turns to
move the wheel from one stop to the opposite stop. In the two wheel
steering mode the steering wheel shall require not more than 10
seconds for the maximum range of movement at low idle engine speed
and shall require no less than 5 seconds at governed engine speed.
There shall be a minimum of 7 inches clearance measured vertically
between the lowest point on the steering wheel rim and a line
parallel to the floor and passing through the highest point of the
unoccupied seat cushion. There shall be a minimum of 3 inches between
the rim of the steering wheel and the directional control lever(s)
for all positions of the lever(s). The steering wheel shall be
capable of withstanding a minimum 300 pound force applied
perpendicular to the plane of the steering wheel, and a minimum 150
pound force applied tangentially to the rim of the steering wheel,
without permanent deformation or damage.
3.17.2 Emergency steering. Emergency steering conforming to SAE J53
shall be provided for retaining steering control in the event of
engine failure or steering power source failure when traveling at any
speed to the maximum speed.
3.18 Brake system. Service and parking brakes shall be provided and
shall be independently actuated systems. If a separate hydraulic
system for the brakes is utilized, the brake system shall be filled
with a fluid that is listed on the qualified product list of
MIL-B-46176. If air brakes are provided, air brake service and
emergency line coupling conforming to SAE J318 shall be provided on
the rear of the vehicle, a relay emergency valve and an air dryer
shall also be provided.
3.18.1 Service braking system. Unless otherwise specified herein,
controlled service brakes shall be provided and shall conform to SAE
J1152 for cranes. The brakes shall be capable of bringing the crane
with no load to a complete stop without any wheel leaving the ground
from maximum crane speed as follows:
a. Dry - within distances specified in table 7 of SAE J1152 with
fishtailing of no more than 1 foot when tested as specified in
4.6.2.14.
b. Fade - within distances specified in table 7 of SAE J1152 with
fishtailing of no more than 1 foot when tested as specified in
4.6.2.14.
c. Wet - Within 10 feet greater distances than those specified in
table 7 of SAE J1152 with fishtailing of no more than 1 foot
when tested as specified in 4.6.2.26.
Pedal force while making any stop shall not exceed 90 pounds. The
brake system shall provide for bleeding of air from hydraulic lines
and for draining of moisture from the compressed air system, as
applicable. Automatic or manual brake adjustment provisions shall be
provided. Automatic adjustment shall maintain correct lining to drum
or disk adjustment without looseness or lockup. Automatic adjusters
shall be enclosed or guarded for protection from environmental damage
or malfunction. The brake system shall withstand an operator's brake
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