PLUG 2818029 - Caterpillar

Solenoid Valve (Pump Pressure Proportional Reducing) - Test and Adjust
Record the main pump PRV pressure for Mode I in Table 6.
Record the main pump PRV pressure for Mode II in Table 6.
Record the main pump PRV pressure for Mode III in Table 6.Note: Correct PRV pressures are needed in order to regulate the main pump.
Table 6
Main Pump PRV Pressure (No Load)    
   Specification    Initial Measurement
(Prior to any Adjustment)    After Calibration    
PRV (Mode I)    
1600 to 1700 kPa (230 to 245 psi)            
PRV (Mode II)    
1900 to 2000 kPa (275 to 290 psi)            
PRV (Mode III)    
2500 to 2600 kPa (360 to 375 psi)            Main Pump (Destroke Pressure) - Test and Adjust
Record the main pump destroke pressure in Table 7.
If necessary, adjust the main pump destroke pressure.Note: If the main pump destrokes too early, hydraulic horsepower will be lost. If the main pump destrokes too late, additional load will be required from the engine.
Table 7
Main Pump Destroke Pressure    
   Specification    Initial Measurement
(Prior to any Adjustment)    After Calibration    
Destroke Pressure (Mode II)    
13500 to 15500 kPa (1950 to 2250 psi)            Engine Speed - Adjust (Load)
Record the PRV pressure for Mode I in Table 8.
Record the PRV pressure for Mode II in Table 8.
Record the engine rpm for Mode III in Table 8.
If necessary, adjust the parameters.Note: Refer to Testing and Adjusting, "Engine Speed - Adjust (Load)".The values must be correct to maintain the balance between the available engine horsepower and the demand for hydraulic power. The engine load speed is stored in the controller.When the actual engine operating speed approaches the "Loaded" engine speed, the controller begins to destroke the main pump in order to maintain the ideal engine speed. Refer to Table 8.Deviations from the "Loaded" engine speed are called the load shift rpm. This adjustment is typically needed after the main pump or the engine has been replaced.
Table 8
Main Pump PRV at High Idle (Load)    
    Specification     Initial Measurement
(Prior to any Adjustment)     After Calibration    
Main Pump PRV at High Idle (Load)     Mode I    
1420 to 1520 kPa (205 to 220 psi)            
Main Pump PRV at High Idle (Load)     Mode II    
1750 to 1850 kPa (245 to 268 psi)            
Main Pump PRV at High Idle (Load)     Mode III     1950 to 2000 rpm            
Illustration 3 g00541045
Load rpm shift (Mode III) (C) Load rpm shift (3) "Loaded" engine speed (4) "No Load" engine speed
Record the rpm difference in the "After Setting the Engine Speed" column in Table 2.Note: The "RPM Difference" is a function under the "PROC" option on the PDT.Swing Pump PRV
Record the swing pump PRV pressure for Mode I in Table 9.
Record the PRV pressure for Mode II in Table