HEAD GP-CYL -B 0R4144 - Caterpillar

Illustration 12 g00914657
(1) Lift Cylinder
(2) Angle Cylinder
(3) Ripper Cylinders
(4) Tilt Cylinder
(5) Cylinder Piston Bypass Valve
(6) Pump
(7) Float Detent
(8) Pump Signal
(9) Return Oil Restrictor
(10) Pump Case Drain
(11) Pump Suction Line
Illustration 13 g00914664
(18) Control valve spool
(19) Spring
(20) Signal passage
(21) Signal cavity
(23) Passage
(27) Drain passage
(31) Passage for angle left
(32) Passage for angle right In the ANGLE LEFT position, control valve spool (18) is shifted to the right. Oil from passage (23) now goes around the spool into the passage for angle left (31). Most of the oil goes to both the rod end of the left angle cylinder and the head end of the right angle cylinder. Some of the oil in the passage for angle left (31) goes through signal passage (20) to the resolver network in order to adjust the pump. Return oil is forced through the passage for angle right (32) and around control valve spool (18). The oil goes back to the tank through drain passage (27). In ANGLE LEFT position, pressure in signal cavity (21) is equal to the pressure in signal passage (20).Control valve spool (18) is shifted to the right in this position, which compresses spring (19). When the control lever is released, spring (19) returns to the normal position. This pushes the control lever back into the HOLD position.ANGLE RIGHT Position
Illustration 14 g00914665
(1) Lift Cylinder
(2) Angle Cylinder
(3) Ripper Cylinders
(4) Tilt Cylinder
(5) Cylinder Piston Bypass Valve
(6) Pump
(7) Float Detent
(8) Pump Signal
(9) Return Oil Restrictor
(10) Pump Case Drain
(11) Pump Suction Line
Illustration 15 g00914659
(18) Control valve spool
(19) Spring
(21) Signal cavity
(23) Passage
(26) Signal passage
(28) Drain passage
(31) Passage for angle left
(32) Passage for angle right In the ANGLE RIGHT position, control valve spool (18) is shifted to the left. Oil from passage (23) now goes around the control valve spool into the passage for angle right (32). Most of the oil goes to both the head end of the left angle cylinder and the rod end of the right angle cylinder. Some of the oil in the passage for angle right (32) goes through signal passage (26) to the resolver network in order to adjust the pump. Return oil is forced through the passage for angle left (31) and around control valve spool (18). The oil returns to the tank through drain passage (28). In the ANGLE RIGHT position, pressure in signal cavity (21) is equal to the pressure in signal passage (26).Control valve spool (18) is shifted to the right in this position, which compresses spring (19). When the control lever is released, spring (19) returns to the normal position. This pushes the control lever back into the HOLD position.Bulldozer Tilt Control Valve
The control valve for blade tilt is located between the control valve for the blade angle and the blade lift control valve .The function of the valve is nearly identical to the function of the bulldozer angle valve. When the blade is being tilted to the right, the oil flow through the valve is similar to the oil flow through the bulldozer angle valve for angling