TM 9-2330-381-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
HYDRAULIC SYSTEM - CONT
24.
GOOSENECK WILL NOT ADJUST OR ADJUSTMENTS ARE SLUGGISH
Step 1.
Check for general hydraulic failures.
Refer to symptom 16 for general hydraulic failures.
WARNING
Be sure all four support legs (para. 2-22 and 2-23) are lowered and supporting the
platform prior to checking the gooseneck isolation valve handles for proper
operation or injury to personnel may result.
Step 2.
Check linkage at gooseneck isolation valve for binding, missing parts, loose connections, and
improper linkage travel.
a. Linkage should be tight and adjusted so that all valve handles move the same distance and open
each valve equally. Adjust valve linkage as required (para. 4-84).
b. Check each valve handle to be sure both valves are being operated. Tighten or remove and
replace defective parts (para. 4-84).
CAUTION
External leakage in the gooseneck/suspension system may have caused one or
more line fracture valves to close. Further operation without resetting the line
fracture valve may cause component overload and premature failure.
Step 3.
Check for possible closed line fracture valve on a suspected gooseneck cylinder by checking both
hoses for equal pressure (stiffness) by bending and observing suspected hoses.
If unequal pressure is found in one of the hoses, one side of line fracture valve may have closed.
Check for external leaks in gooseneck cylinder and reset line fracture valve by lowering gooseneck to
lowest position and holding in downward position for a minimum of 15 seconds (para. 2-18). If line
fracture valve cannot be reset, remove and replace line fracture valve (para. 4-80).
4-41
