MUFFLER 2047401 - Caterpillar

Illustration 2 g00465629
Pilot control valve (attachment) (5) Pilot control valve (attachment) (6) Port (port to tank) (7) Port (port from hydraulic activation control valve) (8) Port (port to top of main control valve) (9) Port (port to bottom of main control valve)Pilot oil from the hydraulic activation control valve enters pilot control valve (5) through port (7) . Port (6) on the pilot control valve returns the pilot oil to the hydraulic tank when the hydraulic control pedal is not activated. Oil is directed to the top of the main control valve through port (8) . Oil is directed to the bottom of the main control valve through port (9) .Single Action Hydraulic Attachment
With a single action hydraulic attachment, the lock pin must be placed in the SINGLE ACTION position (A) . Supply oil is directed to the pilot control valve from the hydraulic activation control valve. The supply oil enters the pilot control valve through port (7) . Port (9) on the pilot valve is not used for single action hydraulic attachments. Port (8) sends pilot oil to the top of the main control valve. The pilot oil at the main control valve shifts the control valve stem downward.Double Action Hydraulic Attachment
With a double action hydraulic attachment, the lock pin must be placed in the DOUBLE ACTION position (C) . Supply oil is directed to the pilot control valve from the hydraulic activation control valve. The supply oil enters the pilot control valve through port (7) . Port (8) sends pilot oil to the top of the main control valve. The pilot oil at the main control valve shifts the control valve stem downward. Port (9) sends pilot oil to the bottom of the main control valve. The pilot oil at the main control valve shifts the control valve stem upward.One Pump and Two Pump Pilot Oil Lines
Illustration 3 g00465696
(10) Port (pilot line for two pump flow) (11) Ball valve (selector valve for either two pump or one pump flow) (12) Pilot valve (13) Pilot oil manifold (14) Main control valve (15) Port (pilot oil to hydraulic tank) (16) Port (pilot oil supply) (17) Port (pilot oil line) (18) Port (pilot oil to boom control valve) (19) Port (pilot oil to tank)The pilot oil lines control the front pump oil flow to the attachment circuit. When the attachment requires a large pump flow, the two pump flow control can be activated. Illustration 3 shows an auxiliary system with optional two pump flow or one pump flow. Ball valve (11) is a selector valve. Two pump flow and one pump flow can be selected by ball valve (11) . Without ball valve (11) , the operator can operate in two pump flow with pilot valve (12) . Pilot valve (12) provides two pump flow to the boom cylinders. When an increase in hydraulic oil is needed for boom operation, pilot valve (12) allows pilot oil to control additional pump oil to