TEST OR INSPECTION
HYDRAULIC SYSTEM - CONT
b. If relief valve R1 is not leaking or defective, or steering pressure indicator stays lit while adjusting
steering with steering control valve or comes on immediately when handle is released, using
multimeter (item 17, appx. B), check which pressure switch closes first. If pressure switch PS5
closes first, check valve P01 may be defective or leaking. If pressure switch PS6 closes first
check valve P02 may be defective or leaking. If pressure switch PS7 closes first, check valve
P03 may be defective or leaking. If pressure switch PS8 closes first, check valve P04 may be
defective or leaking. Refer to paragraph 4-78 and repair or replace parts as required.
SEMITRAILER STEERING DOES NOT TRACK PROPERLY
Check for hydraulic leaks at steering cylinder, fittings, joints, and hoses.
If steering pressure indicator was not on, check indicator light for proper operation.
Check for excessive air in hydraulic system.
Bleed steering system (para. 4-19) and test for proper tracking.
If steering pressure indicator still comes on.
Refer to symptom 27 and troubleshoot indicator light and pressure switches.
If steering pressure indicator stays off and semitrailer still does not track the tractor properly, check
platform steering installation.
Refer to paragraph 4-16 and check platform steering installation for loose, misalined, or broken parts
and perform platform steering alinement as required.
Check steering cylinders for leaks.
Refer to symptom 27 and check steering hydraulic cylinders for leaks.