TEST OR INSPECTION
HYDRAULIC SYSTEM - CONT
Check gooseneck drift, while in the ADJUST mode, by observing front suspension.
a. Lower front suspension (para. 2-19). If front suspension, streetside and/or curbside is two or
three times slower than normal cylinder speed, remove and inspect each respective side of
gooseneck isolation valve (para. 4-84) and replace parts as necessary.
b. If gooseneck drifts and front suspension does not, check gooseneck cylinder for internal leakage
as follows: couple tractor/semitrailer (para. 2-24), operate gooseneck isolation valve handle to
RUN position (para. 2-6), close hydraulic tank shut-off valve, remove lower hose from each
gooseneck cylinder and cap lines to prevent fluid loss, check cylinder port for fluid loss while
watching for platform drift down, remove cap from line, reconnect hoses to cylinder, open
hydraulic tank shut-off valve. If platform drifted and fluid loss from cylinder port was
approximately the same rate, cylinder(s) are leaking internally. Notify DS maintenance to repair
or replace gooseneck cylinder(s).
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