SPINDLE 1920724 - Caterpillar

Illustration 1 g00376612
(A) SINGLE ACTION position (B) STOP position (C) DOUBLE ACTION position (1) Cab floor (2) Pedal assembly (3) Lock pin (4) Spring pin (5) Pilot control valveThe hydraulic controls are bolted to cab floor (1) on the left side of the travel pedal. The hydraulic controls consist of pedal assembly (2) and pilot control valve (5) . The pilot control valve is identical to the travel control valve.Install pin (3) into DOUBLE ACTION position (C) in order to use double action. Lock pin (3) into position with spring pin (4) . With pin (3) in the DOUBLE ACTION position, the pedal can be depressed forward and backward.
Illustration 2 g00462427
Pilot Lines (5) Pilot control valve (6) Hydraulic activation control valve (7) Main control valve
Illustration 3 g00379975
(8) Pedal (9) Rod (10) Seat (11) Spring (12) Spring (13) Spring (14) Stem (15) Stem (16) Return port (17) Passage (18) Passage (19) Pilot oil supply port (20) Port (21) Passage (22) Passage (23) PortWhen pedal assembly (2) is depressed forward, pilot oil is sent to main control valve (7) at the top of the attachment control valve. When the pedal assembly is depressed backward, pilot oil is sent to the bottom of the attachment control valve. The pilot oil moves the stem. The stem then sends pump oil to the attachment. Changing the position of the pedal will determine the oil flow to the two-way attachment.When pedal (8) is rotated forward the pedal pushes down on rod (9) and on seat (10) against the force of springs (11) and (12) . Stem (14) opens passage (17) to passage (22) .As passage (17) is opened, the pilot oil in passage (22) goes through the following passages: passage (17), the passage in stem (14) and out port (20) . The pilot oil goes to main control valve (7) at the top of the attachment control valve. The pilot oil pressure moves the stem. The stem then sends pump oil to the attachment.The pilot oil at the bottom of the stem is forced back to the pilot control valve and port (23) . The pilot oil pushes stem (15) and spring (13) . When the pressure is great enough, stem (15) moves up against the force of spring (13) and passage (18) opens to passage (21) . This allows pilot oil in port (23) to go through the drilled passage in stem (15) and out passage (18) to passage (21) . The pilot oil then flows out of port (16) to the hydraulic activation control valve and to the drain. Spring (13) moves the stem downward. This closes passage (18) to passage (21) when the pilot oil pressure decreases.The same operation occurs when the pedal is rotated in reverse order. The stem in