AXLE GP-FRONT 2608699 - Caterpillar

Introduction
Illustration 2 g03812446
Operators compartment
(35) Left joystick (stick and swing)
(36) Left travel lever
(37) Right travel lever
(38) Right joystick (boom and bucket)
(39) Blade control lever
Illustration 3 g03815027
(40) Hydraulic activation control lever Pilot Oil Circuit
Illustration 4 g03809861
Pilot manifold
(25) Hydraulic activation solenoid valve
(26) Travel speed solenoid valve
(27) Swing boom LH PRV
(28) Auxiliary extend drain PRV
(29) Auxiliary extend press PRV
(30) Swing boom RH PRV
(31) Pressure reducing valve
(32) Pilot manifold
(34) Pilot pressure solenoid
(41) Gauge port
(A1) Travel speed port
(A2) Swing boom LH port
(A3) Auxiliary extend drain port
(B1) Pilot pressure port
(B2) Swing Boom RH port
(B3) Auxiliary extend pressure port
(BRK) Swing Break port
(P) Supply port
(T) Drain port The pressure of the pilot system is limited by pressure reducing valve (31). Pressure reducing valve (31) is located in pilot manifold (32). The pressure reducing valve pressure setting is adjustable.Pilot oil performs the following functions:
Provide pilot oil pressure to the pilot control valves for implements, swing, and travel in order to perform machine operations.
Create pilot oil pressure in order to automatically operate the control devices.Note: Each pilot circuit performs one of the functions above.The pilot oil circuit is classified into the following circuits:
Pilot control valve circuit
Swing parking brake circuitPilot Control Valve Circuits
Oil from pump (23) flows to pilot manifold (32). Oil then flow through pressure reducing valve (31) to hydraulic activation solenoid valve (25). When hydraulic activation control lever (40) is shifted to the UNLOCKED position, hydraulic activation solenoid valve (25) is energized. The pilot oil then flows through hydraulic activation valve (25) and into pilot control valves (8), (9), (20), and (21). These pilot control valves control the implements, swing, and travel systems in order to perform machine operations. When the joysticks and/or travel levers/pedals are moved, the pilot oil flows to main control valve (10) in order to control the machine functions.
Illustration 5 g03844899
Table 1
Pilot line Control Valve Machine Operation
(42) Boom swing control valve BOOM SWING LEFT
(43) Boom swing control valve BOOM SWING RIGHT
(44) Swing control valve SWING RIGHT
(45) Swing control valve SWING LEFT
(46) Stick control valve STICK IN
(47) Stick control valve STICK OUT
(48) Bucket control valve BUCKET OPEN
(49) Bucket control valve BUCKET CLOSE
(50) Auxiliary control valve AUXILIARY DRAIN
(51) Auxiliary control valve AUXILIARY PRESSURE
(52) Boom control valve BOOM RAISE
(53) Boom control valve BOOM LOWER
(54) Blade control valve BLADE RAISE
(55) Blade control valve BLADE LOWER
(56) Travel (R) control valve RIGHT TRAVEL REVERSE
(57) Travel (R) control valve RIGHT TRAVEL FORWARD
(58) Travel (L) control valve LEFT TRAVEL REVERSE
(59) Travel (L) control valve LEFT TRAVEL FORWARD The following example is given for the BOOM LOWER operation and the BOOM RAISE operation. Machine operations for a stick operation, bucket operation, travel operation, and swing operation are accomplished in the same manner as the boom operation.When the joystick