SERVICE MANUALAll three readings must be within the listedspecifications and must not vary more than 345kilopascals (50 PSI). If readings do not meetthis criteria, check for loose belt. If no problemexists with belt, replace pump flow control valve.7Increase engine speed to 1500 RPM and recordflow. Subtract this flow from the flow recorded inStep 2. Flow should not vary more than 3.81/MIN (1 GPM). If flow does vary more than 3.81/MIN (1 GPM), remove flow control valve andclean. Check oil condition. If oil is dirty,disassemble pump and gear, clean andreassemble.8.With engine idling, turn wheel slightly in bothdirections and observe pressure readings.Release wheel quickly; if pressure does not snapback, disassemble and clean gear hydrauliccontrol valve. If oil is dirty, disassemble andclean gear and pump.9With engine idling, turn and hold wheel againstwheel stops in both directions. A noticeable dropin pressure should occur as the wheel hits thestops. If no drop, or a rise in pressure occurs,adjust steering gear relief plungers (if soequipped) or replace steering gear relief valve (ifso equipped) to correct.Fig. 2 SE-2780 Power Steering AnalyzerEXTERNAL LEAKAGE DIAGNOSISThe adjacent diagram has been prepared to showthe potential areas of leakage. If leakage occurs in theareas shown, perform the operation described.When diagnosing external leakage, always check forthe possibility of system overheating. An indication ofoverheating is when the major-ity of the pump gaskets become hard and brittle within48,000 kilometers (30,000 miles) of vehicle operation.Some gaskets normally harden during routine operation,therefore it is important to determine if the majority of thegaskets are hard and brittle. Another indication ofoverheating is when the power steering fluid has de-composed and significantly darkened interior pumpsurfaces. Occasionally a "burnt" oil odor will benoticeable with overheated systems. Overheating isnormally caused by restricted lines causing excessiveback pressure or by severe operating conditions. Acomplete gasket overhaul and/or addition of a coolermay be required.Fig. 3 Suspected Leakage Areas1.Check oil level. An overfilled pump reservoir canbe a cause for leakage. The oil in the steeringsystem expands as heated during normal usage.If overfilled the excess is forced through thereservoir cap vent. Operate the engine andsteering system until nor-mal operatingtemperature is obtained. Remove the reservoircap and check level. Adjust the oil level asrequired. If leakage persists with the oil levelcorrect and the cap tight, replace the cap.CTS-4027 - Page 7SERVICE MANUAL
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