| |
| Illustration 1 | g01146881 |
Blade Control Lever (Single Tilt)
| |
| Illustration 2 | g01113637 |
|
Blade control handle (single tilt) | |
The blade control handle contains a sensor that is designed to detect the movement of the handle in the X axis (tilt) and the Y axis (height). The sensor tells the ECM the position of the blade control handle continuously. The sensor is connected to the handle mechanically within the blade control handle. The center position of the handle is the HOLD position. The X axis is a handle movement of left to right. Moving the handle to the left will select the TILT LEFT and moving the handle to the right will select the TILT RIGHT position. The ECM will select the BLADE FLOAT position, the LOWER position, or the RAISE position, when the blade control handle is moved to the forward position and to the rearward position. The operator selects the position and the sensor tells the ECM. The sensor is a pulse width modulated sensor (PWM). The sensor has a tilt output and a raise/lower output. Each output of the sensor is an input to the ECM. The sensor generates a PWM signal continuously. The duty cycle of the signal will vary in proportion to the position of the blade control handle. The ECM receives the PWM signal. Then, the ECM will measure the duty cycle in order to determine the position of the handle. The frequency of this signal is constant at 500 Hz. The machine electrical system provides +battery voltage to the sensor for operating power. The sensor can be calibrated by using the Caterpillar Electronic Technician service tool. For more information, see the topic Testing and Adjusting, "Calibration". The ECM will detect diagnostic codes that occur to the sensor signal circuits. The CID that is associated with the blade tilt signal is CID 1079. The CID that is associated with the blade raise/lower signal is CID 1078.
Blade Control Lever (Dual Tilt)
| |
| Illustration 3 | g01105319 |
|
(13) Manual Button Switch (Auto Blade Assist)
(14) Auto Button Switch (Auto Blade Assist) (15) Sensor B (16) Thumb Switch (Blade Pitch) (17) Sensor A (18) Blade Control Handle Position Sensor (Thumb Rocker) | |
| |
| Illustration 4 | g01450239 |
|
(If Equipped) (13) Manual Button Switch (Auto Blade Assist) (14) Auto Button Switch (Auto Blade Assist) | |
Each of the switches in Illustration 3 are a momentary switch. Each switch has a normally closed input and a normally closed input to the ECM. The normally closed circuit is closed and the normally open circuit is open, when the switch is in the released position. The normally closed circuit opens momentarily and the normally open circuit closes momentarily, when the switch is pressed and then released. The floating voltage from the ECM that is present at an open switch circuit is 12 DCV. Each switch has two circuits. One of the circuits is normally closed and the other circuit is normally open. These circuits are used for diagnostic purposes. The ECM will detect a failure if the two circuits of the switch are ever in the same state. A diagnostic code for the related switch will be recorded. For more information, see the topic Troubleshooting, "Diagnostic Code List".
Manual button switch (13) is designed to instruct the ECM to change from the auto pitch control to the manual control. This change will deactivate auto pitch control. To reactivate auto pitch control, the operator presses auto button switch (14). The diagnostic code that is associated with the manual select switch is CID 0875.
Mode button switch (14) is designed to instruct the ECM to activate the different modes during the operation of auto pitch. The operator selects the mode by pressing the mode select switch. The diagnostic code that is associated with the mode select switch is CID 0874.
The blade control handle position sensor (18) is designed to instruct the ECM to move the blade to the position of pitch back. The use of this switch will override the auto pitch function. The diagnostic code that is associated with the pitch back switch is CID 1870.
Trigger switch (16) is designed to switch the hydraulics between single tilt and dual tilt. The operator selects the mode by depressing the switch. The diagnostic code that is associated with the pitch back switch is CID 2114.
The blade control lever contains sensor (A) and sensor (B). These sensors are designed to detect the movement of the lever in the X axis (tilt) and the Y axis (height). The sensor tells the ECM the position of the blade control lever continuously. The sensor is connected to the lever mechanically within the blade control lever. The center position of the lever is the HOLD position. The X axis is a lever movement of left to right. Moving the lever to the left will select the TILT LEFT position and moving the lever to the right will select the TILT RIGHT position. The ECM will select the BLADE FLOAT position, the LOWER position, or the RAISE position, when the blade control lever is moved to the forward position and to the rearward position. The operator selects the position and the sensor tells the ECM. Sensor (A) and sensor (B) are a pulse width modulated sensor (PWM). The sensor has a tilt output and a raise/lower output. Each output of the sensor is an input to the ECM. The sensor generates a PWM signal continuously. The duty cycle of the signal will vary in proportion to the position of the blade control lever. The ECM receives the PWM signal. Then, the ECM will measure the duty cycle in order to determine the position of the lever. The frequency of this signal is constant at 500 Hz. The machine electrical system provides +battery voltage to the sensor for operating power. The sensor can be calibrated by using the Caterpillar Electronic Technician service tool. For more information, see the topic Testing and Adjusting, "Calibration". The ECM will detect diagnostic codes that occur to the sensor signal circuits. The CID that is associated with the blade tilt signal is CID 0353. The CID that is associated with the blade raise/lower signal is CID 0352.
| |
| Illustration 5 | g00635449 |
|
Ripper control handle (1) Ripper lift lever (2) Ripper auto stow switch (3) Ripper shank in/out sensor (4) Ripper raise/lower sensor (5) Ripper shank lever | |
The ripper shank in/out sensor (3), the ripper raise/lower sensor (4) and the ripper auto stow switch (2) are components of the ripper control handle. Each of these components are activated by the operator.
| |
| Illustration 6 | g00334076 |
|
Ripper Shank In/Out Sensor | |
The ripper shank in/out sensor (3) is designed to tell the ECM the position of the ripper shank lever (5) continuously. The sensor is connected to the ripper shank lever mechanically. The ripper shank lever has three ranges: SHANK OUT, HOLD and SHANK IN. The operator selects the range and the sensor tells the ECM. The sensor is a pulse width modulated sensor (PWM). The sensor is an input of the ECM. The sensor generates a PWM signal continuously. The duty cycle of this signal varies in proportion to the position of the ripper shank lever. The ECM receives the PWM signal. Then, the ECM measures the duty cycle in order to determine the position of the ripper shank lever. The frequency of this signal is constant at approximately 500 Hz. The machine electrical system provides +battery voltage to the sensor for operating power. The sensor can be calibrated by using the Caterpillar Electronic Technician service tool. The Advisor can also be used to calibrate the sensor. For more information, see the topic Testing and Adjusting, "Calibration". The ECM diagnoses diagnostic codes that occur to the sensor signal circuit. The diagnostic code that is associated with the ripper shank in/out sensor is CID 0879.
| |
| Illustration 7 | g00635500 |
|
Ripper raise/lower sensor | |
The ripper raise/lower sensor (4) is designed to tell the ECM the position of the ripper lift lever (1) continuously. The sensor is connected to the ripper lift lever mechanically. The ripper lift lever has three ranges: RAISE, HOLD and LOWER. The operator selects the range and the sensor tells the ECM. The sensor is a pulse width modulated sensor (PWM) and the sensor is an input of the ECM. The sensor generates a PWM signal continuously. The duty cycle of the signal varies in proportion to the position of the ripper lift lever. The ECM receives the PWM signal. Then, the ECM measures the duty cycle in order to determine the position of the ripper lift lever. The frequency of this signal is approximately 500 Hz. The machine electrical system provides +battery voltage to the sensor for operating power. The sensor can be calibrated by using the Caterpillar Electronic Technician service tool. The Advisor can also be used to calibrate the sensor. For more information, see the topic Testing and Adjusting, "Calibration". The ECM diagnoses diagnostic codes that occur to the sensor signal circuit.
| |
| Illustration 8 | g00635504 |
|
Ripper auto stow switch | |
The ripper auto stow switch (2) is designed to inform the ECM about the request of the operator. The switch is a momentary push button. The switch has a normally closed input and normally open input to the ECM. The normally closed circuit is closed and the normally open circuit is open, when the switch is placed in the released position. The normally closed circuit opens momentarily and the normally open circuit closes momentarily, when the switch is pressed and then released by the operator. The floating voltage from the ECM that is present at an open switch circuit is 12 DCV. Each switch has two circuits. One of the circuits is normally closed and the other circuit is normally open. These circuits are used for diagnostic purposes. The ECM will detect a failed circuit, if the two circuits of the switch are ever in the same state. A diagnostic code will be logged. The diagnostic code that is associated with the ripper auto stow switch is CID 0881.
| |
| Illustration 9 | g01114222 |
The reel in function will be accomplished by moving the winch control handle forward. As the lever is moved, the control will supply the implement ECM with a PWM signal. The ECM will then output a signal to the Reel-In Solenoid. The diagnostic code that is associated with the spool position sensor is CID 1881.
The Pay Out function will be accomplished by moving the winch control handle rearward. As the lever is moved, the control will supply the implement ECM with a PWM signal. The ECM will then output a signal to the Pay-Out Solenoid. The diagnostic code that is associated with the spool position sensor is CID 1881.
The Drum Clutch Release function will be accomplished by pushing the centered winch control handle directly away from the operator on the Winch Control Handle. As the lever is moved, the lever will supply the implement ECM with a PWM signal. The ECM will use the PWM signal from the control handle to turn ON the Clutch Release Solenoid. The diagnostic code that is associated with the position sensor for the drum is CID 1882.
The Low Speed Lock Switch is a momentary push-button single pole double throw switch. The switch will perform a two stage toggle function. When the switch is pushed once, the winch will be in low speed lock. When the switch is pushed again, the winch will be in high range. When the switch is in the low speed lock state, a signal is sent to energize an ON/OFF solenoid. When the system is in low speed lock, the system operates at low speed and high torque in order to be able to reel in heavy loads. The diagnostic code that is associated with the low speed lock switch is CID 1883.
| |
| Illustration 10 | g01113796 |
|
Implement Lockout Switch | |
The implement lockout switch is designed to de-energize the implement lockout solenoid. The ECM will provide power to the solenoid through the implement lockout switch. The circuit is open and the implement lockout solenoid is de-energized, when the switch is placed in the LOCKED position. The switch should be in the LOCKED position before any of the following conditions occur:
- The operator exits the machine.
- The machine is serviced.
- The machine is left unattended.
The switch affects the system in the following manner:
LOCKED - The implement lockout solenoid is de-energized. The implement system is no longer operable.
UNLOCKED - The implement lockout solenoid is energized. The implement system is enabled.
The switch is a single-pole rocker switch. The switch has a normally closed contact and a normally open contact. One contact connects to the switch input of the ECM. The other contact connects to the feedback input of the ECM and to the lockout solenoid. The pole of the switch connects to the output of the ECM for the implement lockout solenoid. The ECM can always determine whether the switch is in the LOCKED position or the UNLOCKED position. The two input circuits are used for diagnostic purposes. The ECM will detect a failure in the circuit if the two circuits of the switch are ever in the same state. The ECM will also record a diagnostic code. The diagnostic code that is associated with the implement lockout switch is CID 0490.
| |
| Illustration 11 | g01114306 |
When the Winch Lockout switch is activated, the solenoids that are responsible for providing winch functions are disabled. The normally closed and normally open contacts will be wired to the winch disable switch feedback inputs. The switch common is shared by both the Winch lockout and the Low Speed Lock switches. If the Winch Lockout Switch fails, all functions of the winch will be disabled. The ECM will also record a diagnostic code. The diagnostic code that is associated with the winch lockout switch is CID 1874.
Implement Pump Pressure Sensor
| |
| Illustration 12 | g01113832 |
|
Main pump pressure sensor | |
The main pump pressure sensor is designed to inform the ECM about the discharge pressure of the main pump. The ECM uses this information for the ripper auto stow function. The sensor is located in the man hole and to the right side of the machine and next to the accumulator. The sensor analog voltage and the sensor is an input of the ECM. The ECM receives the analog voltage and the ECM measures the duty cycle in order to determine the pressure. The frequency of this signal is between 0.5V and 4.5V. The ECM provides +8 DCV to the sensor for operating power. The ECM diagnoses diagnostic codes that occur to the signal circuit of the sensor.
The diagnostic code that is associated with the main pump pressure sensor is CID 1450.
Hydraulic Oil Temperature Sensor
| |
| Illustration 13 | g02581296 |
The sender outputs a voltage signal that corresponds to the temperature of the hydraulic oil. The voltage signal is input to the Implement ECM. This voltage signal will vary representing changes in the hydraulic oil temperatures. As the hydraulic oil temperature changes, the resistance of the sender changes. As the resistance of the sender changes, the hydraulic oil temperature gauge in the instrument cluster will change.
| Temperature | Resistance (Ohms) |
|---|---|
| |
248.7 |
| |
91.7 |
| |
68.0 |