Relays
There are four relays in the system that are activated directly by the Machine ECM. The relays are the ride control relay (if equipped), implement enable relay (if equipped), backup alarm relay, and the torque limiter relay.
Ride Control and Implement Enable Relay (if equipped)
Ride Control (if equipped)
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| Illustration 1 | g01230721 |
The Machine ECM activates the ride control when the ride control/load check switch is placed in the ON position. The activation is based on the machine ground speed in the AUTO position. The ride control system diminishes the effects of a loaded bucket when the machine moves at higher speeds.
Implement Enable (if equipped)
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| Illustration 2 | g01230721 |
The Machine ECM activates the implement function when the implement enable switch is placed in the ON position. If the hydraulic power for the machine is disrupted, the implements may still be lowered. In order to lower the implements, place the lift control lever in the LOWER position and depress the ride control/load check switch.
Parking Brake Alarm Relay
The parking brake alarm relay is used to alert the operator that the shift lever is placed in gear with the parking brake engaged. The Machine ECM activates the relay when the parking brake is engaged and the shift lever is in gear. The machine can drive through the parking brake when the relay is activated.
A single switch to ground signal will be provided to the Machine ECM to monitor the parking brake. The input signal will be grounded when the parking brake lever is in the position associated with engaging the parking brake. The signal switch is a single input switch there will not be any diagnostics performed on this input.
Note: The operator may drive through the parking brake using the following sequence: placing the direction switch in forward or reverse, then in neutral, and then back to the same direction of travel as the first request within 3 seconds. On this second attempt to move the machine with the parking brake engaged, the ECM will shift the transmission into the requested gear. When the machine goes into gear, the action alarm will sound until the directional switch is returned to neutral, or the parking brake is released. A level 2 event will be active when the transmission is not in neutral while the parking brake is engaged. The action lamp & action alarm should actuate right away but the event should not be logged until the machine is detected to be moving.
Backup Alarm Relay
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| Illustration 3 | g01230721 |
Backup alarm is active whenever the shift lever / shuttle handle is in REVERSE. Back up alarm is standard in NACD and optional in EAME
Torque Limiter Relay
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| Illustration 4 | g01230724 |
The Machine ECM activates the torque limiter function when the implement enable switch is placed in the ON position. If the hydraulic power for the machine is disrupted, the implements may still be lowered. In order to lower the implements, place the lift control lever in the LOWER position and depress the ride control/load check switch.
Solenoids
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| Illustration 5 | g01230727 |
The solenoid valves are an output of the Machine ECM. The solenoid is the proportional type. The ECM uses a pulse width modulated signal (PWM) to vary the current to the solenoid. The distance that is Traveled by the solenoid valve is proportional to the electrical current. The position of the valve opens or the position of the valve blocks the flow of oil to the hydraulic cylinder.
Solenoids control the oil flow to the clutches in the transmission. When a direction and gear are selected by the operator, the control module activates the appropriate solenoids. Two solenoids are activated in order to move the machine. One solenoid is activated for the direction and one solenoid is activated for the gear. When a solenoid is activated, a solenoid receives voltage from the control module. When the transmission is in neutral, no solenoids are activated.
The solenoids have a connector with two contacts. One contact receives power from the corresponding connector contact (signal) of the control module. The other contact returns to the control module. All of the solenoids have a return lead. The return leads join with the other return leads.
XMSN Forward Clutch 1
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| Illustration 6 | g01237053 |
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J1-50. The signal contact is connected to the ECM through contact J1-48.
XMSN Reverse Clutch 2
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| Illustration 7 | g01237053 |
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J1-50. The signal contact is connected to the ECM through contact J1-49.
Loader Auxiliary Valve 1
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J1-50. The signal contact is connected to the ECM through contact J1-51.
Loader Auxiliary Valve 2
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J1-50. The signal contact is connected to the ECM through contact J1-52.
Hoe Auxiliary Valve 1 Solenoid 1
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| Illustration 8 | g01237056 |
This feature provides the operator a means to control the hydraulic oil flow to the optional seventh valve section on the backhoe valve stack. Actuating the device located on the handle of the right backhoe control joystick activates the tool control. When the device is actuated up or down, the ECM scales the current according to a preset current map. The current that is output to the solenoid is proportional to the input. Certain requirements are necessary upon power-up of a machine to reduce the risk of unexpected movement of the machine and tools. The inputs to the system that directly control movement of the tools shall power up in the NEUTRAL state. The ECM will require all associated inputs be read in the NEUTRAL state upon power-up. For the proportional input, the neutral state will be 50% +/- 5% duty cycle from the handle. This 10% tolerance allows for variations from handle to handle. The outputs of the system shall power-up in the OFF state. For the proportional solenoid, the off state is where no electrical current is flowing through the solenoid coils.
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J1-60. The signal contact is connected to the ECM through contact J1-58.
Hoe Auxiliary Valve 1 Solenoid 2
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| Illustration 9 | g01237056 |
This feature provides the operator a means to control the hydraulic oil flow to the optional seventh valve section on the backhoe valve stack. The operator actuating the proportional device located on the handle of the right backhoe control joystick activates the tool control. When the proportional device is actuated up or down, the ECM scales the current according to a preset current map. The current that is output to the solenoid is proportional to the input. Certain requirements are necessary upon power-up of a machine to reduce the risk of unexpected movement of the machine and tools. The inputs to the system that directly control movement of the tools shall power up in the NEUTRAL state. The ECM will require all associated inputs be read in the NEUTRAL state upon power-up. For the proportional input, the neutral state will be 50% +/- 5% duty cycle from the handle. This 10% tolerance allows for variations from handle to handle. The outputs of the system shall power-up in the OFF state. For the proportional solenoid, the off state is where no electrical current is flowing through the solenoid coils.
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J1-60. The signal contact is connected to the ECM through contact J1-59.
Hoe Auxiliary Valve 2 Solenoid 1
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| Illustration 10 | g01237056 |
This feature provides control for the hydraulic oil flow to a tool attached to the eighth valve section of the valve stack. The tool control is activated by the operator actuating the device located on the handle of the left-hand control joystick. When the proportional device is actuated up or down, the ECM scales the current according to a preset current map. The current that is output to the solenoid is proportional to the input. Certain requirements are necessary upon power-up of a machine to reduce the risk of unexpected movement of the machine and tools. The inputs to the system that directly control movement of the tools shall power up in the NEUTRAL state. The ECM will require all associated inputs be read in the NEUTRAL state upon power-up. For the proportional input, the neutral state will be 50% +/- 5% duty cycle from the handle. This 10% tolerance allows for variations from handle to handle. The outputs of the system shall power-up in the OFF state. For the proportional solenoid, the off state is where no electrical current is flowing through the solenoid coils.
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J1-60. The signal contact is connected to the ECM through contact J1-61.
Hoe Auxiliary Valve 2 Solenoid 2
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| Illustration 11 | g01237056 |
This feature provides control for the hydraulic oil flow to a tool attached to the eighth valve section of the backhoe valve stack. The tool control is activated by the operator actuating the proportional device located on the handle of the left-hand backhoe control joystick. When the device is actuated up or down, the ECM scales according to a preset current map. Current is output to the solenoid that is proportional to the input. Certain requirements are necessary upon power-up of a machine to reduce the risk of unexpected movement of the machine and tools. The inputs to the system that directly control movement of the tools shall power up in the NEUTRAL state. The ECM will require all associated inputs be read in the NEUTRAL state upon power-up. For the proportional input, the neutral state will be 50% +/- 5% duty cycle from the handle. This 10% tolerance allows for variations from handle to handle. The outputs of the system shall power-up in the OFF state. For the proportional solenoid, the off state is where no electrical current is flowing through the solenoid coils.
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J1-60. The signal contact is connected to the ECM through contact J1-62.
Speed Clutch 1
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| Illustration 12 | g01237062 |
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J2-4. The signal contact is connected to the ECM through contact J2-5.
Speed Clutch 2
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J2-4. The signal contact is connected to the ECM through contact J2-6.
Speed Clutch 3
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| Illustration 13 | g01237064 |
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J2-4. The signal contact is connected to the ECM through contact J2-7.
Forward High
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| Illustration 14 | g01237064 |
The solenoid has a connector with two contacts. The sensor ground is connected to the ECM through contact J2-4. The signal contact is connected to the ECM through contact J2-2.
Gauge Cluster
The indicators for the relays are shown on the LED panel of the gauge cluster.
Other Outputs
The Machine ECM also sends information to the engine ECM via the CAN data link. The Machine ECM also sends information to the dash panel cluster and the service connector via the Cat Data Link.