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Pressure Test

  1. With engine idling, record flow reading on analyzer gauge. If minimum flow is less than 1.6 gallon per minute (6.1L per minute) on Explorer and Ranger, OR less than 2 gallons per minute (7.6L per minute) on Bronco, Pickup and Van, pump may require repair or replacement. Continue test.
  2. At idle, if pressure is greater than 150 psi (11 kg/cm2 ), check hoses for restrictions. Replace as required. Partially close analyzer gate valve to build up pressure to 740 psi (52 kg/cm2 ) for C-II pump or 620 psi (44 kg/cm2 ) on Saginaw pump (Van).
  3. If flow drops below specification, disassemble pump and replace cam pack assembly. If pressure plates are cracked or worn, replace.
  4. DO NOT  close analyzer gate valve for more than 5 seconds. Completely close and partially open gate valve 3 times. Record highest reading each time. If pressure is higher or lower than specified, repair or replace flow control valve or pump. Refer to appropriate PRESSURE TEST SPECIFICATIONS table.
    PRESSURE TEST SPECIFICATIONS

    Application Idle Pressure (1) psi (kg/cm2 ) Relief Pressure psi (kg/cm2 )
    Ford C-II Pump
    Model HBC-KC 740 (52) 1050-1230 (74-86)
    (1) Engine idle RPM must be set to engine decal specification to obtain idle pressure.
    PRESSURE TEST SPECIFICATIONS

    Application Idle Pressure (1) psi (kg/cm2 ) Relief Pressure psi (kg/cm2 )
    Ford C-II Pump 740 (52) 1300-1480 (91-104)
    (1) Engine idle RPM must be set to engine decal specification to obtain idle pressure.
    PRESSURE TEST SPECIFICATIONS

    Application Idle Pressure (1) psi (kg/cm2 ) Relief Pressure psi (kg/cm2 )
    Saginaw Pump
    Model HBA-HA/HB 620 (44) 1250-1450 (88-102)
    Ford C-II Pump
    Model HBC-JX 740 (52) 1300-1530 (91-108)
    Ford C-II Pump
    Model HBC-JY 740 (52) 1350-1530 (95-108)
    (1) Engine idle RPM must be set to engine decal specification to obtain idle pressure.
  5. Set engine speed at 1500 RPM. Record flow. If flow varies more than 1 gallon (3.8L) per minute from pressure measured in step 1), flow control valve in pump must be repaired or replaced.
  6. Turn steering wheel to left and right stops, holding at each stop for 3 seconds. Pressure should be nearly the same as maximum relief pressure. See appropriate PRESSURE TEST SPECIFICATIONS table. Flow should drop below .5 gallon (1.9L) per minute.
  7. If pressure and flow are not as specified, steering gear is leaking internally. Remove steering gear unit. Remove flow control valve. Repair or replace damaged parts. Check control valve seals for damage. See STEERING GEAR UNIT  under OVERHAUL.
  8. If pressure and flow are good, turn steering wheel slightly in both directions and release quickly while watching pressure gauge. Needle should move from normal backpressure reading when steering wheel is turned, and needle should snap back as wheel is released. If gauge reacts slowly, or sticks, rotary valve sleeve assembly in steering gear is sticking. Repair or replace rotary valve sleeve assembly.
  9. Check fluid for signs of contamination. If system is severely contaminated, both hoses, control valve, and pump must be disassembled and cleaned. After reassembly, if problem still exists, check ball joints, linkage and other front suspension members.
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