4-13. TROUBLESHOOTING (CONT)
TEST OR INSPECTION
HYDRAULIC SYSTEM - CONT
OIL OR AIR RELIEVING FROM GOOSENECK CYLINDER AIR RESERVOIR
Check for damaged gooseneck cylinder air reservoir.
If air reservoir is damaged, remove and replace air reservoir (para. 4-95).
Check that oil is dripping or running from relief valve or air breather/check valve at gooseneck
cylinder air reservoir.
a. Check reservoir for leaks. If fittings are leaking, remove and reinstall using pipe sealant (item 18,
b. If excessive oil relieves from air reservoir, it is possible that streetside gooseneck cylinder may be
leaking internally. Refer to symptom 25, step 3b and check streetside gooseneck cylinder for
STEERING WILL NOT ADJUST
Check for normal steering pressure at system gage for adjusting steering. Normal pressures should
read 1000 - 2500 psi (6895 -17238 kPa) when steering wedge is approximately straight ahead and
pressure should rise up to 3000 - 3900 psi (20685 - 26891 kPa) when positioned for an extreme turn.
a. If mechanical binding, damage, leaks, or misalinement is found, adjust, repair, or replace parts as
b. If system pressure gage reads normal but will not adjust when steering valve handle is operated,
refer to symptom 18, steps 3, 4, and 5 and check system ability to maintain proper operating
If system pressure is low and steering will not adjust but semitrailer tracks tractor steering, check
each steering cylinder for internal leakage.