VALVE GP-BANK 5 1048675 - Caterpillar

Illustration 1 g00335098
Component Location (Pilot Manifold) (1) Tilt linkage dump solenoid. (2) Lift linkage lower solenoid. (3) Auxiliary lever forward solenoid. (4) Pilot pressure supply (ON/OFF) solenoid. (5) Tilt linkage tilt back solenoid. (6) Lift linkage raise solenoid. (7) Auxiliary lever rearward solenoid. (8) Pilot pressure inlet screen.Note: System contamination may cause the pilot pressure inlet screen (8) to become plugged. If the screen is plugged all hydraulic functions are slower. This is not a regularly serviceable item.Note: System contamination may cause the pilot pressure inlet screen (8) to become plugged. If the screen is plugged all hydraulic functions are slower. This is not a regularly serviceable item.Solenoid Valve (Lift Linkage Raise)Solenoid Valve (Lift Linkage Lower)Solenoid Valve (Tilt Linkage Dump)Solenoid Valve (Tilt Linkage Tiltback)Solenoid Valve (Auxiliary Lever Forward)Solenoid Valve (Auxiliary Lever Rearward)
Illustration 2 g00348694
Proportional Solenoid Valves The solenoid valves are outputs of the implement ECM. The purpose of the solenoid valves is to direct pilot oil to the main control valves. The control valve spool shifts in order to allow pressure oil to the corresponding cylinder. When the operator moves a control lever the ECM activates the appropriate solenoid valves. The solenoid valves are energized with a PWM signal that is sent by the ECM. The PWM signal acts as a source of variable current to activate the solenoid. Do not check voltage across the solenoid. The maximum current that is available to the solenoids is 850 mA. A PWM signal of 100% duty cycle represents 2 amp of current. Therefore, a 50% duty cycle is 1 amp of current. The maximum duty cycle that will be provided to the solenoid valves is 42.5%.The solenoid valves have a connector with two contacts. One contact receives power from the corresponding connector contact of the ECM (J2-8, J2-1, J1-10, J1-4, J1-11 and J1-17). The other contact of all solenoid valves join together and return to connector contact J1-7 and J2-3 of the ECM.
Illustration 3 g00452286
Proportional Solenoid Input Current (Amps) vs Output Pilot Pressure Illustration 3 shows the relationship between the current going to the solenoid, and the resulting output pilot pressure. As the current increases, the pilot pressure increases. The dashed lines on each side of the solid line indicate the acceptable range. Values that fall outside of the acceptable range may indicate contamination in the hydraulic system. The pilot pressure can be monitored by attaching a pressure gauge to the pilot chamber in question. See Testing and Adjusting, "Pilot Control Valve Chamber Pressure - Check" for more information.
Solenoid coils will be damaged. Do NOT activate the solenoids with a voltage or signal that does not originate from the ECM.
Solenoid Valve (Pilot Pressure Supply)
Illustration 4 g00335122
Pilot Pressure Supply Solenoid ValveThe pilot pressure supply (ON/OFF) solenoid valve is an output of the implement ECM. The purpose of the pilot pressure supply solenoid valve is to disable the pilot hydraulics in failure mode conditions. The pilot pressure supply solenoid valve enables the pilot hydraulics when energized by a constant voltage from the ECM. The pilot solenoid