Hydraulic Pressure In P/S Circuit Check

Hydraulic Pressure in P/S Circuit Check





1) After cleaning joint of high pressure hose and P/S pump (3) thoroughly, disconnect hose from pump and install special tool (oil pressure gauge, attachment and hose). Tighten each flare nut to specified torque.

CAUTION: Take care not to causes damage to A/C condenser during service operation, if equipped.

Special tool
(A): 09915-77410 (Oil pressure gauge)
(B): 09915-77420 (Attachment and hose)
1) Check each connection for fluid leakage and bleed air.





2) With engine idling, turn steering wheel and warm up engine till temperature of fluid in tank rises to 50 - 60°C (122 - 140°F).





3) Check back pressure by measuring hydraulic pressure with engine idling and hands off steering wheel.
When back pressure is higher than specified values, check control valve and piping for clogging.
Back pressure
Lower than 1000 kPa (110 kgf/cm2, 142 psi)
4) Check relief pressure.





^ Increase engine speed to about 1,500 r/m inch(rpm). Close gauge valve (2) gradually while watching pressure increase indicated by gauge and take reading of relief pressure (maximum hydraulic pressure).
Relief pressure
For G16 engine: 7200 - 7900 kPa (72 - 79 kgf/cm2, 1024 - 1123 psi)
For J18 engine: 8200 - 8900 kPa (82 - 89 kgf/cm2, 1166 - 1265 psi)
^ When it is higher than specified values, possible cause is malfunction of relief valve.
^ When it is lower than specified values, possible cause is either failure of P/S pump or settling of relief valve spring.

CAUTION: Be sure not to close gauge valve for longer than 10 seconds.





^ Next, open gauge valve (2) fully and increase engine speed to about 1,500 r/min. Then turn steering wheel to the left or right fully and take reading of relief pressure.
Relief pressure
For G16 engine: 7200 - 7900 kPa (72 - 79 kgf/cm2, 1024 - 1123 psi)
For J18 engine: 8200 - 8900 kPa (82 - 89 kgf/cm2, 1166 - 1265 psi)
^ When it is higher than specified values, possible cause is malfunction of relief valve.
^ When it is lower than specified values, possible cause is failure in steering gear box. Replace gear box.

CAUTION: Be sure not to hold steering wheel at fully turned position for longer than 10 seconds.