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SPOOL-VALVE 4Z9004 - Caterpillar



4Z9004 SPOOL-VALVE Caterpillar parts SPOOL
Rating:
21
Alternative (cross code) number:
CA4Z9004
4Z-9004
4Z9004
Caterpillar 4Z9004 SPOOL-VALVE

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The On/Off solenoids include:
Hydraulic lock solenoidHydraulic Lock Solenoid
The hydraulic lock solenoid is an output of the Machine ECU. 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.Proportional Reducing Solenoid Valve
Illustration 7 g03462498The values in Table 7 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 7
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T=20° C)
Illustration 8 g03462556
A - Port pressure (kPa) vs Current (mA)
The P-Port is blocked and does not allow pressure to the A-port. Therefore, the machine ECU must apply current to the PRV in order to sent pressure to the A-port of the PRV.The PRV's include:
Negative Flow Control 1 Limit PRV
Negative Flow Control 2 Limit PRV
Power Shift Pressure PRVNegative 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 ECU receives various input signals to control the flow limitation from the main hydraulic pumps. When the NFC valves are energized by the machine ECU, pilot oil pressure is directed to the main hydraulic pump regulators from the pilot manifold. The pilot oil pressure causes the hydraulic pumps to destroke which reduces hydraulic oil flow.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.Reverse Proportional Reducing Solenoid Valve
Illustration 9 g02304374
Valve cutaway, hydraulic schematic symbol, and electrical connector designation
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)
Illustration 10 g02304414Reverse PRV's have the P-port open to the A-port with no current applied. Therefore, the machine ECU applies current to the PRV in order to decrease the pressure at the A-port.The reverse PRV's include:
Boom Regeneration PRV
Boom Up Limit PRVBoom Regeneration PRV
The boom regeneration PRV is used in order to control the amount of regeneration oil in the boom circuit. The machine ECU receives an input signal from pressure sensor for boom down control and boom cylinder head end pressure sensor. When the boom cylinder head end pressure is high and the pressure sensor for boom down control detects pilot pressure, the boom regeneration PRV remains de-activated. Pilot oil is then directed through the boom regeneration PRV and to the boom regeneration valve allowing regeneration.When the boom cylinder head end pressure is low and the pressure sensor for boom down control detects pilot pressure, the boom regeneration


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