M313C, M315C, M316C, M318C, M318C MH, M322C and M322C MH Excavators Electronic System Auxiliary Hydraulic System Caterpillar

The auxiliary hydraulic system on the machine provides the ability to configure and control the operation of the work tools. The multifunction valve enables unidirectional or bidirectional hydraulic control of the work tool. Seven possible tools can be configured and stored in memory. The tools can be configured or selected using the Monitor or the AVSpare Electronic Technician (Cat ET). When no tool is selected, the machine ECM will assume that a bucket has been attached to the end of the stick. The seven possible tools that are available are listed below:

• "Tool #1"

• "Tool #2"

• "Tool #3"

• "Tool #4"

• "Tool #5"

• "Generator"

• "Hammer"

• "No Tool"

Each tool has eight parameters:

The active tool can be selected by using AVSpare Electronic Technician or the monitor. See Systems Operation, "Tool Select Menu".

Note: The components that are involved in the auxiliary hydraulic system have changed on machines in the following serial number ranges: BDR2001-UP, BDM2001-UP, BDX2001-UP, BCZ2001-UP, BDK2001-UP, BDY2001-UP,, BEB2001-UP, H2A1-UP, H2B1-UP, H2C1-UP, H2D1-UP, H2E1-UP, H2F1-UP and H2G1-UP. Most of the functionality remains the same as far as operation and configuration of the tools for the auxiliary hydraulic system. The changes are noted in the following text.

Illustration 1	g01151443
Auxiliary hydraulics effective for machines in the following serial number ranges: BDR1-2000, BDM1-2000, BDX1-2000, BCZ1-2000, BDK1-2000, BDY1-2000 and BEB1-2000.

Illustration 2	g01151445
Auxiliary hydraulics effective for machines in the following serial number ranges: BDR1-2000, BDM1-2000, BDX1-2000, BCZ1-2000, BDK1-2000, BDY1-2000, and BEB1-2000.

The following explanation of the left auxiliary pedal forward pressure switch and the auxiliary pedal reverse pressure switch applies to machines with serial numbers in the following serial number ranges: BDR1-2000, BDM2001-UP, BDX1-2000, BCZ1-2000, BDK1-2000, BDY1-2000 and BEB1-2000.

In order to control the selected work tool, the operator uses the left auxiliary pedal. This pedal is attached to the pilot hydraulic lines. Two pressure switches are installed in these lines. The forward pressure switch or the reverse pressure switch will inform the ECM which position the pedal is in. If neither switch is actuated, the machine ECM determines that the pedal is not being pressed. If both switches are actuated at the same time, the machine ECM determines that there is a malfunction.

Auxiliary Pedal Forward Pressure Switch Operation

When the operator presses on the forward section of the left auxiliary pedal, the pilot hydraulic pressure will close the forward pressure switch to ECM ground which inputs + battery power to contact J2-30 (wire M745-BU). The ECM then outputs a defined output current for the proportional flow solenoid at contact J2-41 (wire M748-GN) in order to control the flow in the forward direction. If the tool has been programmed for one direction, the ECM will energize the directional solenoid at contact J2-63 (wire M746-GY). If the tool has been programmed for two directions, the ECM will disable the directional solenoid. The ECM also sends a defined output current for the proportional pressure solenoid at contact J2-40 (wire M744-PU) in order to control the pressure in the forward direction. The current output for these solenoids can be programmed in the Monitor menu or by using Cat ET. The solenoid for flow in the forward direction is set to the value that has been programmed or 420 milliamperes (mA). The greater value is used. The current value for the pressure solenoid is set to the maximum value that has been programmed (defined) for the forward direction.

The current output for these solenoids can be programmed in the Monitor menu or by using Cat ET. The defined current range is 0 Amps to 65.5 Amps.

If the active tool is the generator and the generator enable switch is open, the generator solenoid is de-energized.

The total operating hours of the tool will begin counting when the ECM sends output current to either proportional solenoid.

Auxiliary Pedal Reverse Pressure Switch Operation

When operator presses on the rear section of the left auxiliary pedal, the pilot hydraulic pressure will close the reverse pressure switch to ECM ground which inputs + battery power to contact J2-31 (wire M747-OR). The ECM then outputs an output current for the proportional flow solenoid at contact J2-41 (wire M748-GN) in order to control the flow in the reverse direction. The solenoid for flow in the reverse direction is set to the value that has been defined or 420 mA. The greater value is used. If the tool has been programmed for one direction, the ECM will energize the directional solenoid at contact J2-63 (wire M746-GY). The ECM also sends a defined output current for the proportional pressure solenoid at contact J2-40 (wire M744-PU) in order to control the pressure in the reverse direction. The solenoid for pressure in the reverse direction is set to the maximum value that has been programmed for the reverse direction.

The current output for these solenoids can be programmed in the Monitor menu or by using Cat ET. The defined current range is 0 Amps to 65.5 Amps.

If the active tool is the generator and the generator enable switch is open, the generator solenoid is de-energized.

The total operating hours of the tool will begin counting.

Operation With No Switches Actuated

When no switches are actuated, the machine ECM still sends commands to the solenoids in the multifunction valve. The solenoids for flow are set to the value that has been programmed or 420 mA. The smaller value is used. The solenoid for pressure is set to the maximum value that has been programmed. If the tool has been programmed for one direction, the solenoid for direction is energized. If the tool has been programmed for two directions, the solenoid for direction is de-energized.

If the active tool is the generator and the generator enable switch is open, the generator solenoid is de-energized.

The total operating hours of the tool will stop counting.

Operation With Both Switches Actuated

When both switches are actuated, a problem exists. The machine ECM still sends commands to the solenoids in the multifunction valve. The solenoids for flow are set to 420 (mA). The solenoid for pressure is set to 0 milliamperes. If the tool has been programmed for one direction, the solenoid for direction is energized. If the tool has been programmed for two directions, the solenoid for direction is de-energized.

If the active tool is the generator and the generator enable switch is open, the generator solenoid is de-energized.

The total operating hours of the tool will stop counting.

Auxiliary Pedal Position Sensor

Illustration 3	g01151474
Auxiliary hydraulics effective for machines in the following serial number ranges: BDR2001-UP, BDM2001-UP, BDX2001-UP, BCZ2001-UP, BDK2001-UP, BDY2001-UP,, BEB2001-UP, H2A1-UP, H2B1-UP, H2C1-UP, H2D1-UP, H2E1-UP, H2F1-UP and H2G1-UP.

Illustration 4	g01151476
Auxiliary hydraulics effective for machines in the following serial number ranges: BDR2001-UP, BDM2001-UP, BDX2001-UP, BCZ2001-UP, BDK2001-UP, BDY2001-UP,, BEB2001-UP, H2A1-UP, H2B1-UP, H2C1-UP, H2D1-UP, H2E1-UP, H2F1-UP and H2G1-UP.

The left auxiliary pedal position sensor is equipped on machines in the following serial number ranges: BDR2001-UP, BDM2001-UP, BDX2001-UP, BCZ2001-UP, BDK2001-UP, BDY2001-UP,, BEB2001-UP, H2A1-UP, H2B1-UP, H2C1-UP, H2D1-UP, H2E1-UP, H2F1-UP and H2G1-UP

For machines in the serial number range that is listed above, a position sensor is installed on the left auxiliary pedal. The position sensor indicates to the ECM whether the auxiliary pedal is depressed in the forward direction or the rearward direction. Then, the ECM controls the auxiliary hydraulics by outputting a defined current value to the proportional solenoids and to the directional solenoid when required. The ECM automatically calibrates the position sensor when the key switch is moved to the ON position.

When the operator presses on the forward section of the left auxiliary pedal, the ECM outputs a defined output current for the proportional flow solenoid at contact J2-41 (wire M748-GN) in order to set the maximum flow in the forward direction. If the tool has been programmed for one direction, the ECM will energize the directional solenoid at contact J2-63 (wire M746-GY). If the tool has been programmed for two directions, the ECM will disable the directional solenoid. The ECM also sends a defined output current for the proportional pressure solenoid at contact J2-40 (wire M744-PU) in order to set the maximum pressure in the forward direction. The current output for these solenoids can be programmed in the Monitor menu or by using Cat ET. The solenoid for flow in the forward direction is set to the value that has been programmed or 180 milliamperes (mA). The greater value is used. The current value for the pressure solenoid is set to the selected tool's maximum value that has been programmed (defined) for the forward direction.

The current output for these solenoids can be programmed in the Monitor menu or by using Cat ET. The defined current range is 0 Amps to 65.5 Amps.

If the active tool is the generator and the generator enable switch is open, the generator solenoid is de-energized.

The total operating hours of the tool will begin counting when the ECM sends output current to either proportional solenoid.

When the operator presses on the rearward section of the left auxiliary pedal, the ECM will respond in the same manner as detailed above. If the tool has been programmed for one direction, the ECM will energize the directional solenoid at contact J2-63 (wire M746-GY). If the tool has been programmed for two directions, the ECM will disable the directional solenoid.

Operation With The Active Tool As "Hammer" or "Generator" or "No Tool"

When the active tool is set to "Hammer", the machine ECM energizes the hammer solenoid. When the active tool is set to "No Tool" the machine ECM assumes that a bucket is mounted. See Systems Operation, "Generator Function" for more information on the generator. For these three functions, the values for all of the parameters are preprogrammed in the monitor. The values are in the following table:

Note: When a Generator, Hammer or "No Tool" is active, the defined current value for the maximum flow solenoid should be 0 mA. The minimum value of 180 mA is only applied when one of the configurable auxiliary tools is active.

For more information on selecting and configuring active tools, refer to Systems Operation, "Service Options PW Menu".

The multi-function auxiliary hydraulic system or the hammer can be installed or uninstalled in the Cat ET configuration screen. The two functions can not be installed at the same time.