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Home >> Buick >> 1997 >> Regal GS >> Repair and Diagnosis >> Steering >> Power Steering >> Power Rack & Pinion Steering System >> Testing >> Pressure Test
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Pressure Test

  1. Disconnect high pressure line from power steering pump. Connect power steering pressure tester gauge between high pressure line and power steering pump, using appropriate adapters. Completely open tester valve.
  2. Run engine until fluid reaches operating temperature. Stop engine. Check fluid level. Add fluid if necessary. Start engine. Pressure should be less than 150 psi (10.5 kg/cm2 ). If pressure exceeds specification, stop engine and check for restriction in hose(s).
    CAUTION: To prevent pump damage, DO NOT hold gauge valve closed for more than 5 seconds.
  3. While observing pressure gauge, fully close valve for less than 5 seconds and then open it. Repeat process 2 more times, and record highest pressure displayed each time valve is closed. If readings are more than 1000 psi (70 kg/cm2 ) and within 50 psi (3.5 kg/cm2 ) of each other, go to step 6). If readings are as specified but not within 50 psi (3.5 kg/cm2 ) of each other, go to next step. If readings are not as specified but within 50 psi (3.5 kg/cm2 ) of each other, go to step 5).
  4. Check for sticking flow control valve. Remove valve but DO NOT disassemble. Clean valve using crocus cloth or fine hone. Flush system, if dirty. Install valve and retest system. If readings are now as specified, go to step 6). If reading are not as specified, go to next step.
  5. Replace flow control valve and retest system. If pressure readings are still low, check pump rotor and vanes for wear. Replace complete pump assembly if worn and flush power steering system. If pressure readings are as specified, go to step 7).
  6. With valve open, turn steering wheel from stop to stop. Record highest pressure with wheels at both stops. If highest pressure is not equal to highest pressure recorded in step 3), rack and pinion assembly is leaking internally. Repair or replace assembly. If pressures are equal, no problem exists. Go to next step.
  7. Turn engine off. Remove tester. Reconnect high pressure hose to pump. Check fluid level. Bleed hydraulic system. See HYDRAULIC SYSTEM BLEEDING  under LUBRICATION.
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