SPRING 2004942 - Caterpillar

Illustration 1 g00940012
(11) Activation switch for the work tool (left joystick)
Illustration 2 g00940032
(12) Activation switch for the work tool (right joystick)
Illustration 3 g00995202
(1) Solenoid for the work tool (2) Solenoid for the work tool (3) Attachment control valve (4) Line relief valve (5) Line relief valve (6) Pilot manifold (7) Drive pump (8) Pilot pump (9) Hydraulic tank (10) Work tool pressure switch for the attachment control valvePilot pump (8) supplies oil to solenoid valve (1) and (2) . When the right activation switch for the work tool (12) is pressed, solenoid valve (1) is activated. Pilot oil flows to attachment control valve (3) . The pilot oil shifts the spool in attachment control valve (3) to the DOWNWARD position. Work tool pressure switch (10) cancels the swing brake. The engine returns to high idle if the AEC or the one touch low idle feature is active. Oil from the drive pump (7) flows through the valve. The pump oil flows to the work tool. Return oil flows back through the main control valve to hydraulic tank (9) .When the left activation switch for the work tool (11) is pressed, solenoid valve (2) is activated. Pilot oil flows to attachment control valve (3) . The pilot oil shifts the spool inattachment control valve (3) to the UPWARD position. Implement swing pressure switch (10) cancels the swing brake. The engine returns to high idle if the AEC or the one touch low idle feature is active. Oil from the drive pump (7) flows through the valve. The pump oil flows to the work tool. Return oil flows back through the main control valve to hydraulic tank (9) .Line relief valves (4) and (5) protect the work tool circuit from pressure spikes. These valves also provide makeup oil.