GEAR-PUMP DRIVE 9U8246 - Caterpillar

Illustration 1 g03701597
(1) Left travel motor
(2) Right travel motor
(3) Displacement change valve (Left travel motor)
(4) Displacement change valve (Right travel motor)
(5) Swing motor
(6) Swing parking brake
(7) Pilot control valve (Left joystick)
(8) Pilot control valve (Right joystick)
(9) Swivel
(10) Line (To to displacement change valves)
(11) Valve (Swing brake)
(12) Pilot control valve (Blade)
(13) Manifold (Pilot oil distribution)
(14) Solenoid (Pattern change valve)
(15) Pattern change valve
(16) Swing control valve
(17) Boom control valve
(18) Right travel control valve
(19) Left travel control valve
(20) Main control valve
(21) Bucket control valve
(22) Stick control valve
(23) Blade control valve
(24) Offset boom control valve
(25) Accumulator
(26) Solenoid (Hydraulic lockout)
(27) Solenoid (Two-speed travel)
(28) Line (To swing brake valve)
(29) Passage
(30) Pressure reducing valve
(31) In-line screen
(32) Pilot manifold
(33) Solenoid (Offset boom right)
(34) Solenoid (Offset boom left)
(35) Passage
(36) Slow return check valve
(37) Main pump
(38) Hydraulic tank
(39) Pilot control valve (Travel)
(40) Manifold
(41) Stick In PRV
(42) Boom Down PRV
(43) Boom Up PRV
(44) Stick Away PRV
(45) Stick Out PRV
(46) Pressure sensor (Boom up control)
(47) Center bypass Pilot Oil Circuit
Oil flow is supplied to the pilot system from main pump (37). The pilot system performs the following functions.
Reduce main system pressure to pilot pressure in order to operate the control devices.
Provide pilot oil pressure to travel