GREASE-5 PCT 5113294 - Caterpillar

HOLD Position
Illustration 1 g03161976
(1) Spool (2) Passage (3) SpringIn the HOLD position, the spring (3) holds spool (1) in the centered position. The spool (1) blocks the flow of pump supply oil in passage (2) .Passage (2) is common to all control valves in the bank valve. The spool blocks the flow of pump supply oil until the operator moves the mechanical backhoe controls.STICK OUT Position
Illustration 2 g03164476
(1) Spool (2) Port for head end (3) Load check valve (4) Chamber (5) Pressure compensator valve (6) Load check valve (7) Port for rod end (8) Spring (9) Passage (10) Passage (11) Passage (12) Passage (13) Passage (14) Passage (15) PassageWhen the stick circuit is the only hydraulic circuit in operation, the stick circuit will have the highest signal oil pressure in the hydraulic system. When the backhoe control lever on the left side is moved to the STICK OUT position, spool (1) moves up.When the spool moves up, pump supply oil flows from passage (12) around the spool and into passage (13) .The hydraulic oil in passage (13) flows to pressure compensator valve (5). In the pressure compensator valve, the hydraulic oil flows into internal passages. The pressure compensator valve (5) moves out. As the pressure compensator valve moves out, the cross drilled passage is opened to an internal passage that is in the valve. Some of the hydraulic oil flows inside the pressure compensator valve (5) to chamber (4). The hydraulic oil that flows to chamber (4) is signal oil. The signal oil balances the pressure compensator valve against the hydraulic oil pressure in passage (13). This controls the flow across spool (1) .The signal