EDGE-CUTTING 3599670 - Caterpillar

Piston Motor Group (Two-Speed) for Multi-Terrain and Compact Track Loader Machines
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(1) Case drain (port)
(3) Brake release (port)
(4) Port for the "A" or "B" high-pressure loop
(5) Speed sensor connection
(7) Port for the two speed control
(8) Port for the "A" or "B" high-pressure loop
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(2) Flushing valve
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(9) Swashplate
(10) Pistons
(11) Passage from speed selector valve (6) to piston (10)
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Hydraulic schematic for the two speed
(3) Brake release
(4) High-pressure line for the "A" or "B" high-pressure loop
(6) Speed selector valve
(8) High-pressure line for the "A" or "B" high-pressure loop
(10) Piston that controls the swashplate angle
(11) Passage from speed selector valve (6) to piston (10)
( 12) Piston motor (hydrostatic left side)
(13) Solenoid valve (two-speed control)
(14) Line to the return manifold
(15) Piston motor (hydrostatic right side)
(16) Charge oil supplyIf the piston motor (two-speed) is not in the rabbit mode, the motor operates in the same manner as the standard piston motor.
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Travel control lever
(17) Travel control lever
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Two-speed control switch
(17) Travel control lever
(18) Two-speed control switch
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Left-hand console
(19) Multifunction switch for the left-hand triggerWhen the machine is equipped with two-speed capability, the machine can be switched to rabbit mode. A control switch is mounted on the travel control lever (17) which activates the two speed function.The two speed control switch (18) is a momentary switch. With the multifunction switch (19) in the TWO SPEED position, press the button once in order to activate the rabbit mode. Press the switch again in order to deactivate the rabbit mode and return to the normal mode. When the machine is in the normal mode, the hydrostatic system functions in the same manner as the machines that are equipped with the standard piston motors. Refer to the Operation and Maintenance Manual, "Operator Controls (Joystick Controls)" for a complete description of the two speed operation.When the operator presses the two speed control switch (18) in order to activate the rabbit mode, the switch sends an electrical signal to the solenoid valve (two-speed control) (13). Since the solenoid in the solenoid valve (two-speed control) is now energized the spool that is part of the solenoid valve (two-speed control) shifts to the left. When the spool is shifted to the left the spool will allow charge oil to flow to the port (7) that is for the two speed control. The oil then flows to the speed selector valve (6) that is a part of the piston motor (hydrostatic left side) (12) and the speed selector valve (6) that is a part of the piston motor (hydrostatic right side) (15).The normal angle of the swashplate (9) is at the maximum angle. When the swashplate is at the maximum angle, the piston motor is at maximum displacement. When the piston motor is at maximum displacement, the piston motors are at high torque and the piston motor is at low speed.When the charge oil pressure is greater than the force of the spring that is positioning the speed