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| Illustration 1 | g00791568 |
The Illustration above shows the Frame Leveling System when the Machine is Tilted to the Left. (1) Diverter valve (2) Coupler cylinder (quick coupler) (3) Load control valve for coupler cylinder (4) Bank valve (5) Signal relief valve (6) Line (load sensing) (7) Work tool cylinder (8) Rear section of stabilizer control valve (9) Front section of stabilizer control valve (10) Stabilizer control valve (11) Stabilizer cylinder (right side) (12) Stabilizer cylinder (left side) (13) Load control valve for left side stabilizer cylinder (14) Load control valve for right side stabilizer cylinder (15) End section of bank valve (16) Joystick (17) Implement section of bank valve (frame leveling) (18) Dual stage relief valve (19) Relief valve (coupler tilt) (20) Implement section of bank valve (boom extend/retract) (21) Pilot control valve (22) Solenoid valve (23) Solenoid valve (24) Solenoid valve (25) Solenoid valve (26) Pressure reducing valve (27) Brake reservoir (28) Hydraulic tank (29) Piston pump (30) Filter (31) Line (load sensing) (32) Inlet section of bank valve (33) Metering pump (34) Compensating cylinders (35) Valve (quick coupler pins) (36) Implement section of bank valve (boom raise/lower) (37) Load control valve for telescoping cylinder (38) Boom cylinder (boom raise/lower) (39) Implement section of bank valve (coupler tilt) (40) Load control valve for boom cylinder (41) Relief valve (coupler tilt) (42) Relief valve (43) Telescoping cylinder (boom extend/retract) (44) Implement section of bank valve (auxiliary section) (45) Valve (46) Load control valve for frame leveling cylinder (47) Frame leveling cylinder (48) Load control valve for tilt cylinder (49) Tilt cylinder (coupler tilt) (PP) Pump delivery (CP1) Frame leveling cylinder (pressure oil) (R) Return oil (S) suction oil (LS) Load sensing oil | |
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| Illustration 2 | g00791569 |
Frame Leveling Cylinder (46) Load control valve for frame leveling (47) Frame leveling cylinder | |
Frame leveling cylinder (47) is installed between the machine frame and the front axle. The frame leveling cylinder is attached to the machine frame, and the piston rod is attached to the front axle. The frame leveling cylinder is extended in order to tilt the frame to the left, and the frame leveling cylinder is retracted in order to tilt the frame to the right.
The frame leveling cylinder is equipped with a load control valve (46) that controls the flow of oil into the cylinder and out of the cylinder. Both sides of the frame leveling cylinder are closed by the load control valve when the switch for frame leveling control is in the HOLD position or if the supply of oil to the frame leveling cylinder fails for any reason during operation.
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| Illustration 3 | g00791570 |
(50) Switch (Frame Leveling) | |
The frame leveling cylinder is controlled by implement section (17) of bank valve (4) which is operated by switch (50). The spool in the implement section is spring centered and the spool is operated by solenoids.
When the machine is tilted to the left, oil (CP1) flows from the implement section to the piston side of the frame leveling cylinder. As the frame leveling cylinder extends, oil (R) flows from the rod side through bank valve (4), and through filter (30) to hydraulic tank (28) .
When the machine is tilted to the right, oil flows from the implement section to the rod side of the frame leveling cylinder. As the frame leveling cylinder retracts, oil flows from the piston side through the bank valve, and through the filter to the hydraulic tank.