4-13. TROUBLESHOOTING (CONT)
TEST OR INSPECTION
HYDRAULIC SYSTEM - CONT
GOOSENECK WILL NOT ADJUST OR ADJUSTMENTS ARE SLUGGISH - CONT
Check that system pressure gage reads less than 1000 psi (6895 kPa) while trying to lower
Check gooseneck control valve section of 4-way directional control valve for internal leaks or
contamination. Remove, clean, and repair or replace parts as necessary (para. 4-77).
Check that system pressure does not exceed 1500 psi (10342 kPa) while trying to raise gooseneck
Check for mechanical obstructions or damage to gooseneck cylinders or gooseneck pivot.
defective, notify DS maintenance.
GOOSENECK DRIFTS DOWN, DROPS OR WILL NOT SUPPORT ITSELF
Check for evidence of leakage at gooseneck cylinder, line fracture valves, gooseneck control valve,
and gooseneck isolation valve.
Repair or replace parts found defective as required. If gooseneck cylinder is leaking, notify DS
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.
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