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MIL-C-53057(ME)
APPENDIX
TEST METHOD NO. 6
LONGITUDINAL GRADEABILITY - EMERGENCY STOPPING - PARKING BRAKE
1. TEST course:
The length of the test course shall be not less than three times
the wheelbase of the crane, graded to the specified slope,
within 1 percent grade. Grade resistance shall be sufficient to
prevent significant wheel slip.
2. TEST APPARATUS:
Speed indicator.
3. TEST PROCEDURE:
a. Drive the crane forward up the slope, entering the course at
a speed of not lese than 2 mph, nor more than 4 mph. Continue
through the course, maintaining a speed of not less than 2
mph. Make a total of three such passes up the slope specified
for ascending operation.
b. Use the same procedure as described in a, moving forward down
the slope specified for descending operation.
c. Drive the crane forward onto the slope specified for brake
operation, then stop and hold the crane with the service
brakes for not less than 1 minute, with the crane in neutral
gear range. Set the parking brake, release the service brake,
and hold for not less than 1 minute.  Release the parking
brake, and continue up the slope off the course.
d. Use the same procedure as described in c, moving forward down
the slope at not less than 2 mph. Stop the crane within a
distance of 20 feet by applying the service brakes at a
pressure that prevents the rear wheels from leaving the
ground.
e. Position the crane at the top of and facing down the slope
specified for braking operation. Shut off the engine and
allow the crane to roll down the slope in neutral gear range,
until a speed of 2 mph is attained. Apply the emergency brake
provisions (parking or service brake as applicable) and bring
the crane to a stop. Release the brake, allow the crane to
begin to roll, and apply the brake again to stop the crane,
and repeat for a total of six dead engine stops.
69

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