Note: The details that are listed below assume that the parking brake is released.
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| Illustration 1 | g03716095 |
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Hydraulic schematic of the winch for the Reel In position (1) Brake solenoid valve (2) Winch logic valve (4) Winch charge pump (5) Crossover relief valve (6) Winch pump (7) Brake pack (8) Winch arrangement (9) Displacement control valve (10) Shift actuator piston (11) Crossover relief valve (13) Servo valve (15) Winch motor (22) Implement ECM (23) Winch control lever (24) Winch drive away switch (25) Winch freespool switch (27) Winch pressure sensor (MC) Motor case drain (T) Tank (WD) Winch drain | |
When the control lever (23) is in the REEL IN position, a pulse width modulated signal is sent to the implement electronic control module (22). The duty cycle of the pulse width modulated signal varies with how far in the REEL IN position the control lever is pulled. The ECM interprets the signal as an operator request to reel in the winch. The ECM sends a pulse width modulated signal to the reel in solenoid at servo valve (13). The duty cycle of the pulse width modulated signal to the solenoid is proportional to the duty cycle sent from the control lever (23). A stronger request will energize the reel in solenoid further and cause a greater system response.
The hystat drive charge pump provides pilot oil pressure to the winch logic valve (2). Pilot oil originates from winch charge pump (4). The charge pump provides makeup loop oil pressure to crossover relief valves (5) and (11). The charge pump provides pressure to servo valve (13) signaling the winch pump (6) the direction to flow for reel in. The implement ECM receives a feedback signal from the winch pressure sensor (27).
Brake solenoid valve (1) is energized by the implement ECM. The brake valve will shift to the left allowing pilot oil to travel to brake pack (7), disengaging the winch brake.
Winch pump (6) provides high-pressure oil to winch motor (15) and two speed motor valve (9). two speed motor valve provides pressure to shift the actuator piston. The winch motor automatically shifts to a higher displacement when pressure goes high in the winch drive loop.
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| Illustration 2 | g03724129 |
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Hydraulic schematic of the winch for the Reel Out position (1) Brake solenoid valve (2) Winch logic valve (4) Winch charge pump (5) Crossover relief valve (6) Winch pump (7) Brake pack (8) Winch arrangement (9) Displacement control valve (10) Shift actuator piston (11) Crossover relief valve (13) Servo valve (15) Winch motor (22) Implement ECM (23) Winch control lever (24) Winch drive away switch (25) Winch freespool switch (27) Winch pressure sensor (MC) Motor case drain (T) Tank (WD) Winch drain | |
When the control lever (23) is in the REEL OUT position, a pulse width modulated signal is sent to the implement electronic control module (22). The duty cycle of the pulse width modulated signal varies with how far in the REEL OUT position the control lever is pulled. The ECM interprets the signal as an operator request to reel in the winch. The ECM sends a pulse width modulated signal to the reel out solenoid at servo valve (13). The duty cycle of the pulse width modulated signal to the solenoid is proportional to the duty cycle sent from the control lever (23). A stronger request will energize the reel out solenoid further and cause a greater system response.
Pilot oil originates from winch charge pump (4). The charge pump provides makeup loop oil pressure to crossover relief valves (5) and (11). The charge pump sends pilot oil pressure to winch logic valve (2). The charge pump provides pressure to servo valve (13) signaling the winch pump (6) the direction to flow for reel out. The implement ECM receives a feedback signal from winch pressure sensor (27).
Brake solenoid valve (1) is energized by the implement ECM. The brake valve will shift to the left allowing pilot oil to travel to brake pack (7), disengaging the winch brake.
Winch pump (6) provides high-pressure oil to winch motor (15) and two speed motor valve (9). two speed motor valve provides pressure to shift the actuator piston. The winch motor automatically shifts to a higher displacement when pressure goes high in the winch drive loop.
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| Illustration 3 | g03724133 |
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Hydraulic schematic of the winch for the Drive Away position (1) Brake solenoid valve (2) Winch logic valve (4) Winch charge pump (5) Crossover relief valve (6) Winch pump (7) Brake pack (8) Winch arrangement (9) Displacement control valve (10) Shift actuator piston (11) Crossover relief valve (13) Servo valve (15) Winch motor (16) Drive away solenoid (17) Drive away valve (18) Drive away flow throttling valve (22) Implement ECM (23) Winch control lever (24) Winch drive away switch (25) Winch freespool switch (27) Winch pressure sensor (MC) Motor case drain (T) Tank (WD) Winch drain | |
The momentary drive away switch (24) has a normally closed and a normally open contact. When the normally closed contact is connected to ground, and the normally open contact is open, the switch is not engaged. When the two positions are reversed, the switch is engaged. The implement ECM monitors the two contacts and detects when the drive away switch has been engaged. When the switch has been engaged, the implement ECM energizes the Drive Away solenoid (16).
The drive away solenoid (16) will produce pilot oil when drive away is selected. This selection will activate the normally closed drive away valve (17) which connects both sides of the hystat loop.
With the winch pump swashplate in the neutral position, oil is forced through the drive away flow throttling valve (18). Oil then circulates through the drive away flow throttling valve (18). Also, the oil bypasses the pump.
The drive away solenoid (16) and the brake solenoid valve (1) are energized. The brake (7) will now be disengaged.
After a load has been attached to the winch cable and the machine drives away with a stationary load, the winch motor acts as a pump.
As the machine speed increases, the motor speed will increase. As the motor speed increases, flow across the drive away throttling valve (18) will increase. As flow across the drive away valve increases, pressure drop across spool increases. This spool is actually a flow compensator spool. This restriction in turn slows down the drum from rotating. This rotation prevents the cable from tangling. This action prevents the operator from driving away too fast.
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| Illustration 4 | g03724192 |
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Hydraulic schematic of the winch for the Drive Away position (1) Brake solenoid valve (2) Winch logic valve (4) Winch charge pump (5) Crossover relief valve (6) Winch pump (7) Brake pack (8) Winch arrangement (9) Displacement control valve (10) Shift actuator piston (11) Crossover relief valve (12) Freespool actuator piston (13) Servo valve (14) Winch charge filter (15) Winch motor (16) Drive away solenoid (17) Drive away valve (18) Drive away flow throttling valve (19) Freespool solenoid (20) Winch drum (21) Freespool clutch (22) Implement ECM (23) Winch control lever (24) Winch drive away switch (25) Winch freespool switch (27) Winch pressure sensor (MC) Motor case drain (T) Tank (WD) Winch drain | |
The momentary freespool switch (25) has a normally closed and a normally open contact. When the normally closed contact is connected to ground, and the normally open contact is open, the switch is not engaged. When the two positions are reversed, the switch is engaged. The implement ECM monitors the two contacts and detects when the free spool switch has been engaged. When the switch has been engaged, the implement ECM energizes the Freespool solenoid (19).
The freespool solenoid (19) will produce pilot oil when FREESPOOL is selected. This selection will activate the normally closed freespool actuator piston (12) which opens the freespool clutch (21).
The free spool solenoid (19) is energized. This action also disengages the freespool clutch (21). Once the freespool clutch (21) is disengaged, the winch drum (20) is free to rotate and can be turned by hand. The motor and the pump are stationary.
There will be no flow in the loop during the free spool operation.
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| Illustration 5 | g03724214 |
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(1) Brake solenoid valve
(7) Brake pack (16) Drive away solenoid (17) Drive away valve (19) Freespool solenoid (20) Winch drum (21) Freespool clutch (22) Implement ECM (23) Winch control lever (24) Winch drive away switch (25) Winch freespool switch (MC) Motor case drain (T) Tank (WD) Winch drain | |
When the winch control lever (23) is in the HOLD position, a pulse width modulated signal is sent to the implement electronic control module (22).
The brake solenoid valve (1), the drive away solenoid (16), and the free spool solenoid (19) are not energized. Each valve is closed off from pilot flow. Each valve is then open to the tank (T).
The normally closed drive away valve (17) is closed.
The brake (7) is engaged and the free spool clutch (21) is engaged. The winch drum (20) will not turn.