Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1984SUBURBAN K2500, 5.7 M, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 9 (POWER STEERING GENERAL SERVICING)TESTINGPRESSURE TEST
1984 GMC Suburban K2500, 5.7 M, Standard
Pressure Test
1984 GMC Suburban K2500, 5.7 M, StandardSECTION Pressure Test
WARNING: This page does not describe the selected car, but rather 22 other vehicles, including the 1983 GMC Vandura Special, 1983 GMC Vandura, 1983 GMC Suburban, 1983 GMC S15 Pickup, and 1983 GMC S15 Jimmy. However, it is still accessible from the selected car via links, so may be relevant.
- With belt tension correct, disconnect power steering pump pressure hose, keeping hose end raised to prevent fluid loss. Connect pressure hose of gauge to power steering pump fitting and connect second hose from valve side of tester to steering gear inlet.
- Open valve and run engine until fluid reaches normal operating temperature of 170°F (77°C). Check fluid level and add if necessary.
- Note pressure reading with valve open and engine idling. Pressure shoule be 80-125 psi (5.6-8.8 kg/cm2 ).
- If pressure is above 200 psi (14 kg/cm2 ), check hoses for restrictions and poppet valve (Saginaw gears) for proper assembly.
- If flow drops below 1.8 gals./min. (6.8 L/min.) for Saginow pumps, disassemble pump and replace cam pack.
- 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, replace flow control valve. If within specifications, but readings are not within 50 psi (3.5 kg/cm2 ) of each other, remove flow control valve and clean or replace.
- If flow varies from step 5) reading by more that 1 gal./min. (3.8 L/min.), remove flow control valve and clean or replace.
- With valve open, turn steering wheel all the way from right-to-left stops and record pressure. DO NOT hold wheel against stops more than 5 seconds. Pressure should be the same as recorded in Pressure Test Specifications.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.