PILOT 1T0519 - Caterpillar

Blade Tilt
The function of the blade tilt left and blade tilt right is nearly identical to the function of the blade raise. When the AccuGrade system commands the blade to be tilted right or tilted left, pilot valve (58) remains in the neutral position. Tilt left solenoid (53) and tilt right solenoid (51) for the blade in the bank valve (50) sends the pilot signal to the tilt control valve (60). Pump oil is then sent to the tilt cylinders in order to tilt the blade to the left or right.Bank Valve (Grade Control) (R Series)
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(65) Bank valve (66) Tilt right solenoid (67) Blade raise solenoid (68) Tilt left solenoid (69) Blade lower solenoid (70) Pilot lockout solenoidThe bank valve (65) 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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(50) Bank valveThe bank valve (65) 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 (66) Tilt left solenoid (67) Blade lower solenoid (68) Tilt right solenoid (69) Blade raise solenoid (70) Pilot lockout solenoid (71) Signal to pump compensatorWhen the auto grade mode is active, pilot lockout solenoid (70) 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 (71) 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, refer to the System Operation manual for your machine.Blade Lift
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The bank valve in blade lift (65) Bank valve (66) Blade raise solenoid (67) Tilt right solenoid (68) Blade lower solenoid (69) Tilt left solenoid (70) Pilot lockout solenoid (71) Resolver (72) Lift control valve (73) Pilot Valve (74) Resolvers (75) Tilt control valve (76) Pressure SensorWhen the AccuGrade system commands the blade to be raised, the pilot valve (73) remains in the neutral position. The blade raise solenoid (69) in the bank valve (65) sends the pilot signal to the side for lift on the lift control valve (72). Pump oil is then sent to the lift cylinders in order to raise the blade.Signal oil from the bank valve (65) is directed to the resolver (71). The resolver (71) determines the highest pressure between pilot valve (73) and bank valve (65). The highest pressure is then directed to the resolver network in the main control valve. Refer to the System Operation Manual for your machine.Manual