Prior to adjusting gooseneck height, ensure that both gooseneck isolation and
suspension shut-off valve handles have been pulled outward to the ADJUST
position or injury to personnel from unexpected movement or damage to
equipment may result.
c. Make sure gooseneck isolation valve handle (1) and suspension shut-off valve handle (2) are pulled outward to
ADJUST position. Make sure valve handles are pulled out as far as they will go.
d. Pull up handle of gooseneck valve (3) to raise gooseneck. Once gooseneck reaches highest position and stops,
release handle of gooseneck valve (3).
e. Push down handle of gooseneck valve (3) to lower gooseneck. Once gooseneck reaches lowest position and
stops, release handle of gooseneck valve (3).
When the gooseneck is raised to an intermediate height, it may travel 1 to 3 inches
(2.5 to 7.6 cm) upward after the handle is released. This is caused by air trapped in
the cylinder and can be stopped immediately by momentarily moving the handle to
the down position. If this occurs, it may be minimized by operating the gooseneck
full up to full down for two full cycles.
f. Raise or lower gooseneck to any desired height.
g. If semitrailer is going to be parked, lower gooseneck by pushing handle of gooseneck valve (3) until gooseneck
reaches lowest position and stops; then, release handle.
h. After gooseneck adjustments are complete, shut down APU (para. 2-16).
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