Coach Exterior - 19
PA-1652 Operator's Manual H3-45 Coach
l Transverse thrust: (0.5 x GTWR)
l Vertical tension and compression: (0.5 x
GTWR)
Loads indicated must be applied without incurring
loss of attachments or distortion or failure which
could affect the safe towing of trailer.
3. The ball and trailer coupling must meet the
following minimum test load requirements without
incurring failure. Use the indicated Gross Weight
Rating (GTWR) of your trailer and multiply by the
indicated value below.
l Longitudinal tension and compression:
(GTWR x 3)
l Transverse thrust: (GTWR x 1)
l Vertical tension and compression: (GTWR x
1.3)
In this case, failure is identified as the point at
which the coupling or ball will accept no additional
test load without separation of the ball from the
coupling ball socket, or the occurrence of a metal
fracture of either coupling ball or coupling
assembly, which results in separation of the ball
from the coupling ball socket.
4. Two lengths of safety chain shall be used. The
strength rating (minimum breaking force) of each
individual chain and its connecting means shall be
equal to, or exceed the trailer's Gross Weight
Rating (GTWR).
5. Towing vehicle must be equipped with engine or
transmission retarder. The engine or the
transmission retarder on the vehicle must be
functional at all time (to be inspected frequently).
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