PANEL AS-LH 5632312 - Caterpillar

Hydraulic Schematic for the Pilot System
Illustration 1 g01950445
(1) Two speed control valve (left travel) (2) Two speed control valve (right travel) (3) Spool for the swing brake (4) Pilot control valve (boom and bucket) (5) Pilot control valve (stick and swing) (6) Main control valve (7) Pilot control valve (right travel) (8) Pilot control valve (left travel) (9) Pilot pump (10) Pilot manifold (11) Pilot control valve (blade) (12) Pilot relief valve
Illustration 2 g01157268
Operator's compartment (13) Right joystick (boom and bucket) (14) Left joystick (stick and swing) (15) Right travel lever (16) Left travel lever (17) Blade control leverThe flow rate of the pilot pump does not vary as the pump directs oil under pressure to the main control valve. The pressure of the pilot system is regulated by pilot relief valve (12) .Pilot oil has the following functions:Operation of the main control valve - When joysticks (13) and (14) and travel levers (15) and (16) are operated, pilot oil is sent to main control valve (6) via pilot control valves (4), (5), (7), and (8). See Illustration 1. The blade is activated through pilot control valve (11) .Generation of signal pressure - The following operations are carried out by the signal pressure that is generated in the pilot circuit:
Provide pilot oil pressure to the pilot control valves for implements, swing, and travel in order to perform machine operations.
The swing parking brake is released.
When the implement system is activated during machine travel, the straight travel control valve is activated. This enables the machine to maintain straight travel.