TH220B, TH330B and TH340B Telehandlers Hydraulic System Electrical Input Components Caterpillar


Electrical Input Components
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TH220B, TH330B and TH340B Telehandlers Hydraulic System [RENR7707]
ELECTRICAL AND STARTING SYSTEM
SENSOR GP
TH220B, TH330B and TH340B Telehandlers Hydraulic System Electrical Input Components
1.1. Switches
2.2. Joystick Control
3.2. Auxiliary Switches
4.2. Thumb Slider
5.2. Boom Critical Angle Switch
6.2. Frame Leveling Switch
7.2. Boom Retracted Switch.
8.2. Quick Coupler Switch
9.2. Continuous Flow Switch
10.2. Implement Lockout Switch
11.2. Boom Lowered Switch



Illustration 1g00997548

Input components.

Switches

Switches provide information to the ECM (15). Switches are two state devices. The switches are either open or the switches are closed. This is true for each of the terminals on the switch. The terminals are inverse of each other when a switch has two terminals that are connected. The implement disable switch is an example of this type of switch.

Closed - The switch closes the circuit to ground or the switch closes the circuit to the battery.

Open - The switch opens a circuit to the ECM input.

Joystick Control




Illustration 2g00900916

The three auxiliary switches and the thumb slider are located in the joystick control.

Auxiliary Switches

The auxiliary select switch (7) allows the operator to choose the auxiliary one circuit or the auxiliary two circuit. The auxiliary plus switch (2) controls the circuit in a positive direction and uses port A flow. The auxiliary negative switch (4) controls the circuit in a negative direction and port B for flow.

Thumb Slider

The thumb slider (6) can be configured in one of two modes.

The thumb slider sensor is configured in the North American Construction configuration. Then, the thumb slider sensor is configured for the coupler tilt. The telescope in and the telescope out is configured for the side-to-side movement of the joystick.

The thumb slider sensor is configured in the Bucket mode configuration. The thumb slider sensor is configured for the telescope in and the telescope out. Then, the side to side motion of the joystick is for the coupler tilt.

Boom Critical Angle Switch

If equipped, the boom critical angle switch (3) will signal the ECM when the angle of the boom is above the critical angle of 40 degrees. The signal from the boom critical angle switch is required in order to actuate the rear axle lock.

Note: If the critical angle switch fails, a diagnostic code will be generated and the rear axle will be locked. When this situation occurs, the function for the boom raise is still operational provided that the parking brake is applied. The transmission will also be in the disabled mode.

Frame Leveling Switch




Illustration 3g00939831

The frame leveling switch (12) sends a signal to the machine ECM. There are two solenoids for the frame leveling cylinder. One solenoid pushes the valve spool and one solenoid pulls the valve spool. The machine ECM energizes the solenoid. This is dependent on the position of the frame leveling switch.

Boom Retracted Switch.

The switch (5) signals the machine ECM when the boom is retracted. In order for the machine to be roaded, the boom must be retracted.

Quick Coupler Switch




Illustration 4g00900999

The quick coupler switch (13) allows the operator to operate the pins of the coupler in order to change the work tools that are attached to the coupler. This operation is performed remotely by the operator without the need to exit the machine.

Continuous Flow Switch




Illustration 5g00903130

The continuous flow switch (13) signals the ECM that a continuous flow of hydraulic oil is required for the actuators of the work tools. This is done on the auxiliary circuit only.

Implement Lockout Switch




Illustration 6g00903419

The implement lockout switch (16) disables the PHS functions. The switch signals to the machine ECM. The machine ECM de-energizes the pilot shutoff solenoid and the ET implement status screen will indicate if the implement lockout switch has locked out the functionality of the hydraulic system.

Boom Lowered Switch

Table 1
Boom Lowered Switch    
Pin     Description    
1     Power    
2     Normally Open    
3     Normally Closed    
4     Ground    

The boom lowered switch (10) signals the machine ECM that the boom is in the store or the travel position.

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