MANIFOLD GP-CONTROL 5260678 - Caterpillar

Illustration 5 g01158530Note: The values in Table 7 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 7
Rated Voltage 24 VDC
Coil Resistance 32.0 3.2Ω (T=20° C) Swing Brake Solenoid
The swing brake solenoid is an output of the Machine ECM. The swing brake solenoid is energized in order to release the swing brake. When the swing brake is released, the upper structure is free to rotate. The swing brake is released when the control levers are actuated. The swing brake solenoid is de-energized approximately 6.5 seconds after any lever is moved to NEUTRAL position.Travel Speed Solenoid
The travel speed solenoid is an output of the Machine ECM. When the travel speed solenoid is active, the machine can travel at high speed. The travel speed solenoid is active when the travel speed mode switch is set to "RABBIT (high)" mode. The travel speed also depends on the delivery pressure of the main pump. If the delivery pressure of the main pump is high, the travel speed solenoid is de-energized. When the delivery pressure of the main pump is low, the travel speed solenoid is energized.Straight Travel Solenoid
The straight travel solenoid is energized to maintain straight travel even though a swing operation or implement operation is performed during travel.Hydraulic Lock Solenoid
The hydraulic lock solenoid is an output of the Machine ECM. The hydraulic lock solenoid is energized in order to enable the primary hydraulic pressure. The hydraulic lock solenoid is de-energized in order to disable the primary hydraulic pressure.This solenoid is activated while the key switch is in the ON position and the hydraulic lock lever is in the UNLOCK position.Swing Priority Solenoid
When swing priority is activated, the output flow from the idler pump supplies hydraulic oil to the swing hydraulic circuit. Since swing priority increases the swing acceleration, swing priority is useful for loading operations. Swing priority is also useful for leveling operations and trenching operations when higher swing force is required.Proportional Reducing Solenoid Valve
Illustration 6 g02703776Note: The values in Table 8 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 8
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T=20° C) Power Shift Pressure PRV
The power shift pressure PRV is used to destroke the main pump under load to maintain engine speed. The main functions of the PRV, in conjunction with, the monitoring system, are listed below:
The PRV manages the transfer to engine power into hydraulic power as needed.
The system control the output of the pump according to the workload, improving fuel efficiency.Negative Flow Control 1 Limit PRV and Negative Flow Control 2 Limit PRV
Two proportional reducing valves for negative flow control are used to control the amount of NFC signal to the pump regulators. The machine ECM receives various input signals to control the flow limitation from the main hydraulic pumps. When the NFC valves are energized by the machine ECM, pilot oil pressure is directed to the main hydraulic pump regulators from the pilot manifold. The pilot