TH220B, TH330B and TH340B Telehandlers Hydraulic System Location of Electrical Components Caterpillar


Location of Electrical Components
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1.1. Switch (Lockout Control)
2.1. Joystick Control
3.2. Sensor (Boom Raise/Lower)
4.2. Sensor For Boom Extend And Boom Retract Or Boom Tilt Forward And Rackback.
5.2. Switch For Boom Extend and Boom Retract Or Boom Tilt Forward And Rackback.
6.2. Switch (Auxiliary Actuator in the + Direction)
7.2. Switch (Auxiliary Actuator in the - Direction)
8.2. Switch (Auxiliary Services 1 or 2)
9.1. Switch (Continuous Auxiliary Flow)
10.1. Switch (Quick Coupler)
11.1. Switch (Frame Level)
12.1. Switch (Fully Lowered Boom)
13.1. Switch (Critical Angle)
14.1. Switch (Fully Retracted Boom)
15.1. Switch (Reversing Fan (If Equipped))
16.1. Machine (ECM)
17.1. Main Control Valve (Implement)
18.2. Electronic Pilot Valve (Implement)
19.2. Valve ECM (Implement)
20.1. Solenoids (Frame Level)
21.1. Solenoid (Diverter Valve)
22.2. Solenoid (Diverter Valve for Auxiliary Services 1)
23.2. Solenoid (Diverter Valve for Auxiliary Services 2)
24.1. Relay (Frame Level)
25.1. Relays (Diverter Valve)
26.1. Relays (Quick Coupler)

The electronic system for the hydraulics consists of the following components:

  • Switch (Lockout Control)

  • Joystick Control

  • Switch (Continuous Auxiliary Flow)

  • Switch (Quick Coupler)

  • Switch (Fully Lowered Boom)

  • Switch (Frame Level)

  • Switch (Critical Angle)

  • Switch (Fully Retracted Boom)

  • Switch (Reversing Fan (If Equipped))

  • Machine ECM

  • Main Control Valve (Implement)

  • Solenoid (Frame Level)

  • Solenoid (Diverter Valve)

  • Relays (Frame Level)

  • Relays (Diverter Valve)

  • Relays (Quick Coupler)

Switch (Lockout Control)




Illustration 1g00996978

Switch (lockout control)

The switch is located at the right side of the seat.

The switch signals the ECM that the operator wants to disable the following functions:

  • Fork control

  • Boom raise/lower

  • Boom extend/retract

  • Quick coupler pins

  • Auxiliary actuators

Joystick Control




Illustration 2g00996991

Joystick control

The joystick is located at the right side of the seat.

The joystick controls the following operations:

  • Boom raise/lower

  • Boom extend/retract

  • Tilt forward and rackback

  • Auxiliary actuator + and - directions

  • Auxiliary services 1 and 2




Illustration 3g00942111

(1) Sensors for boom raise/lower

(2) Sensors for boom extend/retract or quick coupler tilt

(3) Switch for boom extend/retract or quick coupler tilt

(4) Switch for auxiliary actuator + direction

(5) Switch for auxiliary actuator - direction




Illustration 4g00942119

(6) Toggle switch for auxiliary services 1 or 2

The joystick control can be configured for the following two different operating arrangements.

First Arrangement - Sensor (2) controls the function for the coupler tilt. Switch (3) controls the function for the boom extend/retract.

Second Arrangement - Sensor (2) controls the function for the boom extend/retract. Switch (3) controls the function for the coupler tilt.

Both Arrangements - Sensor (1) controls the function for the boom raise/lower. Switch (4) controls the auxiliary actuator in the + direction. Switch (5) controls the auxiliary actuator in the - direction. Switch (6) selects either the auxiliary services 1 or 2 function.

Sensor (Boom Raise/Lower)

Sensor (1) is located in the base of the joystick control.

The sensor signals the ECM to operate the function for the boom raise or the boom lower.

Reference: See Systems Operation/Testing and Adjusting, "General Information" for more information.

Sensor For Boom Extend And Boom Retract Or Boom Tilt Forward And Rackback.

Sensor (2) is located in the base of the joystick control.

The sensor signals the ECM to operate the function for the boom extend/retract or the sensor signals the ECM to operate the function for tilt forward and for the tilt rackback.

Reference: See Systems Operation/Testing and Adjusting, "General Information" for more information.

Switch For Boom Extend and Boom Retract Or Boom Tilt Forward And Rackback.

Switch (3) is located on the top of the joystick control.

The switch signals the ECM to operate the function for the boom extend/retract or the tilt forward and for the tilt rackback.

Reference: See Systems Operation/Testing and Adjusting, "Electrical Input Components" for more information.

Switch (Auxiliary Actuator in the + Direction)

Switch (4) is located on the top of the joystick control.

The switch signals the ECM to operate the function for the auxiliary actuator in the + direction.

Reference: See Systems Operation/Testing and Adjusting, "Electrical Input Components" for more information.

Switch (Auxiliary Actuator in the - Direction)

Switch (5) is located on the top of the joystick control.

The switch signals the ECM to operate the function for the auxiliary actuator in the - direction.

Reference: See Systems Operation/Testing and Adjusting, "Electrical Input Components" for more information.

Switch (Auxiliary Services 1 or 2)

Switch (6) is located on the front of the joystick control.

The switch allows the operator to toggle between auxiliary services 1 and 2.

Reference: See Systems Operation/Testing and Adjusting, "Electrical Input Components" for more information.

Switch (Continuous Auxiliary Flow)




Illustration 5g00997095

Switch (continuous auxiliary flow)

The switch is located on the right side of the instrument cluster.

The switch signals the ECM that a continuous flow of hydraulic oil is required for the auxiliary services. The continuous flow switch will allow a maximum of 60 L/min (16 US gpm). 90 L/min (24 US gpm) is possible by pressing the switch for four or five seconds.

Reference: See Systems Operation/Testing and Adjusting, "Electronic Input Components" for more information.

Switch (Quick Coupler)




Illustration 6g00997104

Switch (quick coupler)

The switch is located on the left side of the instrument cluster.

The switch signals the ECM that the operator wants to actuate the locking pins for the quick coupler.

Reference: See Systems Operation/Testing and Adjusting, "Electronic Input Components" for more information.

Switch (Frame Level)




Illustration 7g00902794

Switch (frame level)

The switch is located on the right side of the instrument cluster.

The switch controls the solenoids in the frame leveling valve.

Switch (Fully Lowered Boom)




Illustration 8g00941761

Switch (fully lowered boom)

The switch is located inside the main frame at the rear of the boom on the right side.

The switch signals the machine ECM that the boom is in the stored position or the position for travelling the machine.

If the machine is equipped with an access platform, the boom must be in the stored position before travelling.

Switch (Critical Angle)




Illustration 9g00902789

Switch (critical angle)

The switch that detects the critical angle is located inside the main frame at the rear of the boom.

The switch signals the ECM when the angle of the boom is above 40 degrees. The ECM then sends a signal in order to activate the following:

  • Rear axle lock (if equipped)

  • Disable the frame leveling.

  • The transmission is neutralized.

Reference: See Systems Operation/Testing and Adjusting, "Rear Axle Lock" for further information.

Switch (Fully Retracted Boom)




Illustration 10g00941765

Switch (fully retracted boom)

The switch is located on the front left side of the fixed boom section.

The switch signals the ECM to lock out the following functions when the boom is extended:

  • Frame leveling

  • Rear axle lock after 40 degrees

Reference: See Systems Operation/Testing and Adjusting, "Electronic Input Components" for more information.

Switch (Reversing Fan (If Equipped))




Illustration 11g01171612

Switch (Reversing Fan)

The switch controls the fan in the reverse motion.

Note: Refer to Operation and Maintenance Manual, SEBU7708, "Operator Controls" for the proper operation of the switch.

Machine (ECM)




Illustration 12g00987318

Location of Machine ECM

The machine ECM is located on the inside of the engine enclosure.

The machine ECM receives information from switches, sensors and other electronic controls on the machine via the following electronic links.

  • AVS data link

  • CAN PHS data link

  • CAN data link (Machine)

The ECM then processes all of the information in order to activate the various outputs.

Main Control Valve (Implement)




Illustration 13g00902798

(7) Electronic Pilot Valve (Implement)

(8) Valve ECM (Implement)

Electronic Pilot Valve (Implement)

Electronic pilot valve (implement) (7) is attached to the bank valve 4 (implement). The main control valve is located inside the main frame at the rear of the machine.

Pilot valve (7) includes four pairs of pilot solenoids. Each pair of solenoids control one of the spools in the bank valve 4 (implement) that control the machine functions. The solenoids control the spools in the bank valve 4 (implement) in response to electronic signals from the pilot valve ECM's (8) .

Reference: See Systems Operation/Testing and Adjusting, "General Information" for more information.

Valve ECM (Implement)

The ECM's (8) for the pilot valve are connected to pilot valves (7) .

The ECM's for the pilot valve send a signal to the pilot solenoids in pilot valve (7), in order to control the pilot pressure to the pilot solenoids. The ECM for the pilot valve receives information from the machine ECM via the CAN (PHS) data link. The valve ECM also transmits diagnostic information back to the machine ECM.

Reference: See Systems Operation/Testing and Adjusting, "General Information" for more information.

Solenoids (Frame Level)




Illustration 14g00902804

Solenoids (frame level)

The solenoids are located on the lock valve for the frame leveling cylinder. The lock valve is attached to the frame leveling cylinder.

The machine ECM controls the state of the relays for the frame leveling valve. The solenoids are then energized or de-energized by the relays. The solenoids shift the spool in the control valve which sends pump oil to the frame leveling cylinder.

Solenoid (Diverter Valve)

Solenoid (Diverter Valve for Auxiliary Services 1)




Illustration 15g00941838

Solenoid (diverter valve for auxiliary services 1)

The solenoid is located in the diverter valve. The diverter valve is installed on the left side of the boom head. On standard machines, a single diverter valve is installed.

The machine ECM energizes the relays for the solenoid on the diverter valve. The relays then energize the solenoid on the diverter valve. The solenoid moves the spool in the diverter valve. The spool controls the flow of oil to either the auxiliary services 1, or to the hydraulic actuator for the quick coupler pins.

Solenoid (Diverter Valve for Auxiliary Services 2)




Illustration 16g00902806

Solenoid (auxiliary diverter valve for auxiliary services 2)

A second diverter valve is installed as an option to direct oil to a second auxiliary service.

The machine ECM energizes the relay for the solenoid on the diverter valve. The relay then energizes the solenoid on the diverter valve. The solenoid moves the spool in the diverter valve. The spool controls the flow of oil to an actuator for the auxiliary services 2.

Relay (Frame Level)




Illustration 17g00941811

Relay (frame level)

The relay is located in the fuse panel. The fuse panel is located behind an access cover in the left side of the cab arrangement.

The machine ECM energizes the relay for the solenoid in the frame leveling valve. The relay then energizes the solenoid on the lock valve for the frame leveling valve when the switch for the frame level on the instrument cluster is operated.

Relays (Diverter Valve)




Illustration 18g00941817

Relays (diverter valve)

The relays are located in the fuse panel. The fuse panel is located behind an access cover in the left side of the cab arrangement.

The machine ECM energizes the relays for the solenoid on the diverter valve. The relay then energizes the solenoid on the diverter valve.

The relay on the left is for the ground function. The relay on the right is for the power function.

Relays (Quick Coupler)




Illustration 19g00941818

Relays (quick coupler)

The relays are located in the fuse panel. The fuse panel is located behind an access cover in the left side of the cab arrangement.

The machine ECM energizes the relays for the solenoid on the quick coupler valve. The relay then energizes the solenoid on the quick coupler valve.

The relay on the left is for the ground function. The relay on the right is for the power function.

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