LINES GP-PILOT 4645070 - Caterpillar

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(1) Bank valve (2) Tilt left solenoid (3) Blade lower solenoid (4) Tilt right solenoid (5) Blade raise solenoid (6) Pilot lockout solenoidBank valve (1) for the AccuGrade System consists of five solenoids. Four of the five solenoids send pilot oil to the main control valves in order to actuate the control valve spools. The fifth solenoid acts as a pilot lockout solenoid.
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(1) Bank valveBank valve (1) for the AccuGrade System is located on the front of the main control behind the access door on the right fender.
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The bank valve in auto grade mode (2) Tilt left solenoid (3) Blade lower solenoid (4) Tilt right solenoid (5) Blade raise solenoid (6) Pilot lockout solenoid (7) Signal to pump compensatorWhen the auto grade mode is active, pilot lockout solenoid (6) is energized. This allows pilot oil to flow to each of the four solenoids in the bank valve. When blade movement is necessary, the corresponding solenoid is energized. Pilot oil is then sent to the main control valve. Load sensing signal (7) sends the pilot oil for the AccuGrade bank valve to the pump compensator. The additional pilot pressure from the bank valve combines with the margin pressure which makes the standby pressure higher in the hold position. The higher standby pressure allows the AccuGrade system to make fine corrections easier because the pump is already pre-stroked. For more information regarding low pressure standby, see the System Operation, "Hydraulic Pump - Piston".Blade Lift
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The bank valve in blade lift (1) Bank valve (2) Tilt left solenoid (3) Blade lower solenoid (4) Tilt right solenoid (5) Blade raise solenoid (6) Pilot lockout solenoid (8) Resolver (9) Lift control valve (10) Pilot Valve (11) Resolvers (12) Pressure Sensor (13) Tilt control valveWhen the AccuGrade System commands the blade to be raised, pilot valve (10) remains in the neutral position. The blade raise solenoid (5) in bank valve (1) sends pilot signal to the side for lift on the lift control valve (9). Pump oil is then sent to the lift cylinders in order to raise the blade.Signal oil from bank valve (1) is directed to resolver (8). Resolver (8) determines the highest pressure between pilot valve (10) and bank valve (1). The highest pressure is then directed to the resolver network in the main control valve. Refer to System Operation, "Signal Resolver Network" for more information on this subject.Manual Blade Lower In Auto Grade Mode
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Bank valve in manual lower of the blade (1) Bank valve (2) Tilt left solenoid (3) Blade lower solenoid (4) Tilt right solenoid (5) Blade raise solenoid (6) Pilot lockout solenoid (8) Resolver (9) Lift control valve (10) Pilot Valve (11) Resolvers (12) Pressure sensor (13) Tilt control valveIf pilot valve (10) is activated and the AccuGrade System is in the auto grade mode, resolvers (11) will only allow the highest oil pressure to pass to the main control valve. The higher pressure from the pilot valves can override the AccuGrade System.If the