Coach Exterior 2-17
PA-1628 Operator's Manual H3-45 COACH
2. The trailer coupling attachments must meet
the following minimum static test load
requirements. Use the indicated Gross Trailer
Weight Rating (GTWR) of your trailer and
multiply by the indicated value below.
l Longitudinal tension and compression: (1.5 x
GTWR)
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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