Pressure Test

Note pressure reading with valve open and engine idling. Pressure should be 80-125 psi (5.6-8.8 kg/cm² ).
If pressure is above 200 psi (14.1 kg/cm² ), check hoses for restrictions and poppet valve (Saginaw gears) for proper assembly.
Close gate valve completely and reopen 3 times. Record highest reading each time. DO NOT close valve for more than 5 seconds. If pressure is less than specification, clean or replace flow control valve in pump. If pressures are still low, replace pump.
If readings are within specifications and within 50 psi (3.5 kg/cm² ) of each other, pump is operating properly. Refer to the PRESSURE TEST SPECIFICATIONS table. If pressures are high, but do not repeat within 50 psi (3.5 kg/cm² ), flow control valve in pump is sticking. Remove flow control valve. Clean or replace flow control valve.
If pump is within specifications, open valve and turn steering wheel from right to left stops. Record pressure. DO NOT hold wheel against stops more than 5 seconds.
Pressure should be same as specified. Refer to the PRESSURE TEST SPECIFICATIONS table. If pressure is low, steering gear is leaking internally and must be overhauled.
Turn steering wheel from left to right with engine idling at 600-800 RPM. See PRESSURE TEST SPECIFICATIONS table.
If pressure is low, momentarily close valve. If pressure is less than specified, pump is faulty. If pressure is within specification but was low at previous reading, steering gear is faulty.

PRESSURE TEST SPECIFICATIONS