Hydraulic System Testing

With engine not running, disconnect pressure hose from pump. Install Gauge (J-29877 ) and shut-off valve in hose using extra hose. Gauge capacity should exceed 1250 psi (88 kg/cm² ). Pressure gauge must be connected between valve and pump.
Bleed system by holding gauge beneath fluid reservoir with shut-off valve open. Check fluid level in reservoir with engine idling. Refill if necessary. Turn steering wheel from lock-to-lock several times until thermometer indicates that hydraulic fluid has reached a temperature of 122°-140° F (50°-60° C).
When checked with engine running at 1500 RPM and valve closed, fluid pressure must be 1085-1210 psi (77-85 kg/cm² ). If fluid is not at specified pressure, oil pump is malfunctioning.
NOTE: DO NOT leave shut-off valve fully closed more than 15 seconds or pump may be damaged internally.
If step 3) indicates that pump pressure is to specifications, open valve fully to test steering gear assembly. With engine running, turn steering gear lock-to-lock and note oil pressure. If steering gear assembly is okay, pressure will be 1085-1210 psi (77-85 kg/cm² ). If pressure is not to specification, steering gear may require repair.

NOTE: Avoid holding steering wheel at lock position more than 5 seconds or fluid temperature will increase sharply.