MEASURING & ADJUSTING PRESSURES 2.7 LOWPRESSURE CIRCUIT A. LowPressureRelief Valve Pressure Measurement
WARNING ¯ WHENPERFORMING THIS TEST, DO NOT OPERATEANY HYDRAULICCONTROLSl ¯ ANY MOVEMENT OF HYDRAULICCONTROLS WILL CAUSEEXTENSIVE DAMAGE TO GAUGES! 1. Performmachinepreparation proceduresas described in 2.1 MACHINE PREPARATION 2 (1500 psi) PressureGauges using 105kg/cm in al and a2 Test Ports on P1 and P2 Main Pumps. 2. Movethrottle control to "HI-IDLE,"PlaceKPSS ModeSwitch in "H"-ModeSeeFigure 2.33. DO NOT TOUCHHYDRAULICCONTROLS. ~ (1500 psi) 3. Recordreading from 105kg/cm PressureGauges at al anda2 test ports on P1 and P2 Main Pumps.Reduceengine RPM to "LO"idle. 4. Place KPSSModeSwitch in "D"-Modeand movethrottle to "HI-IDLE".SeeFigure2.33. DO NOT TOUCHHYDRAULICCONTROLS. 5. Recordreading from PressureGaugesat al and a2 test ports on P1 and P2 MainPumps. 6. Compare readingsto properchart for specific machinebeing tested. B. LowPressureRelief Valve Pressure Adjustment 1. Shouldadjustmentof the LowPressureRelief Valvesbe necessary,refer to the ShopManual for the Specific Machine being adjusted.
FIGURE2.33
SK300ILLUSTRATED
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liIi
P2
I
LOW PRESSURE
I~ t L~
REUEFVA’VE ..........
FIGURE2.34
NOTE TheLowPressureRelief Valvesare not adjustableexternally. Theyare adjustedusing intemalShims. 2. TheLowPressureRelief Valvesare located in the endsectionsof the MainConb’olValve.See Figure 2.34 for SK200~460 and Performance InspectionSpecificationchartsandillustraUons for specific model.
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