GEAR 7G8134 - Caterpillar

Line Relief Valve (Makeup Valve In Operation) (Typical Illustration)
(1) Passage. (2) Valve. (3) Valve. (4) Spring chamber. (8) Orifice. (9) Return passage. (13) Shoulder.When oil is lost through operation of the line relief valve for the rod end of a cylinder, the oil has to be made up (replaced) in the head end to prevent a vacuum condition.When oil is lost through operation of the line relief valve for the head end of a cylinder, the oil has to be made up (replaced) in the rod end to prevent a vacuum condition.Because passage (1) is connected to spring chamber (4) through orifice (8), a vacuum can occur in passage (1) and spring chamber (4). Oil pressure from return passage (9) acts on shoulder (13) of valve (2). The back side of shoulder (13) receives the negative pressure occurred in spring chamber (4). Valve (2) moves to the right. Now the oil from return passage (9) goes to passage (1) as makeup oil, removing the vacuum condition in passage (1).Five Valve Bank Oil Flow
320, 325, And 330 Feller Buncher Five Valve Bank Hydraulic schematic.
(1) Port. (2) Port. (3) Port. (4) Port. (5) Port. (6) Port. (7) Port. (8) Port. (9) Port. (10) Port. (11) Port. (12) Port. (13) Port.
322 Feller Buncher Five Valve Bank Hydraulic schematic.
(1) Port. (2) Port. (3) Port. (4) Port. (5) Port. (6) Port. (7) Port. (8) Port. (9) Port. (10) Port. (11) Port. (12) Port. (13) Port.
320, 325, And 330 Feller Five Valve Bank.
(1) Port. (2) Port. (3) Port. (4) Port. (5) Port. (6) Port. (7) Port. (8) Port. (9) Port. (10) Port. (11) Port. (12) Port. (13) Port.
322 Feller Buncher Five Valve Bank.
(1) Port. (2) Port. (3) Port. (4) Port. (5) Port. (6) Port. (7) Port. (8) Port. (9) Port. (10) Port. (11) Port. (12) Port. (13) Port.For the saw circuit, the main oil flow from the auxiliary pump flows into port (11). When the spool in the saw valve is shifted to start saw operation, the oil flows out port (1) to the saw motor and back to port (2). The return oil flows out port (12) and on to tank.For the other circuits, the oil flow is similar, but the main oil comes from the main pump through the auxiliary spool of the main control valves and into port (13).
(14) Stroke limiters.The side tilt circuit has stroke limiters (14) that are used to limit the movement of the spool in the side tilt valve. As the stroke limiter is turned clockwise, the side tilt movement is slower. As the stroke limiter is turned counter-clockwise, the side tilt movement becomes more rapid.Log Loader Auxiliary Hydraulic System
Introduction
The main components of the Log Loader auxiliary hydraulic system are fixed displacement auxiliary pump, a solenoid valve group with relief valve, a solenoid valve group for the grapple circuit, control handles and various lines. The solenoid valve group with relief valve controls the rotator circuit. This valve gets oil from the auxiliary pump. The other solenoid valve