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catmastertech
catmastertech, Technician
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Experience:  19 years Cat, 3 years Case
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How do I calibrate governor actuator for a CAT 312 backhoe

Resolved Question:

How do I calibrate governor actuator for a CAT 312 backhoe S/N 7DK6687?
Submitted: 7 years ago.
Category: Heavy Equipment
Expert:  catmastertech replied 7 years ago.

-Could you explain your situation a little more?
The serial number does not work, is this the engine?

Look for the PIN serial number, it may begin with a 6GK.

Is this a "Gray Market" machine?

Is this a 312 or 312B?

Can you describe the display, what color is it?

Is it in good working order?

Customer: replied 7 years ago.

The serial number we have is the correct one for the machine. In searching, I ran across someone else who had a similar situation and he said it was a grey market machine. Your answer to that question was very informative - the diagram of the dash was the same. The only thing we need to know is how to start calibration mode and how to stop. All other directions were included in your answer to that question. It is a 312 in working order.

Expert:  catmastertech replied 7 years ago.

I hope these images will go through, the site has had problems the past week.

 

graphic

 

 

Electronic Monitor Panel
(1) Engine coolant temperature gauge. (2) Fuel gauge. (3) Action lamp. (4) Character display. (5) Monitor panel. (6) Hydraulic oil temperature gauge. (7) Work mode selector switch. (8) Air heater indicator. (9) Charge alarm indicator. (10) Engine coolant temperature alarm indicator. (11) Hydraulic oil temperature alarm indicator. (12) Engine oil pressure alarm indicator. (13) Controller alarm indicator. (14) Monitor alarm indicator. (15) Work mode BOOM PRIORITY indicator. (16) Work mode SWING PRIORITY indicator. (17) Power mode selector switch. (18) Power mode III indicator. (19) Power mode II indicator. (20) Power mode I indicator. (21) Work mode FINE CONTROL indicator. (22) Light switch. (23) Light 1 indicator. (24) Light 2 indicator. (25) Wiper 2 indicator. (26) Travel speed HIGH (rabbit) indicator. (27) Travel speed LOW (tortoise) indicator. (28) Travel speed control switch. (29) AEC indicator. (30) Switch panel. (31) AEC switch. (32) Wiper 1 indicator. (33) Washer indicator. (34) Washer switch. (35) Wiper switch. (36) Alarm cancel switch. (37) Service switch. (38) Alarm cancel indicator.

Introduction
The Electronic Monitor Panel activates and displays the output received from the Electronic Controller. The Electronic Controller is divided into two service program modes. Each program mode has a particular function as follows:

1. Data Mode:
This program mode contains eight function modes and provides the necessary information for the mechanic to easily determine the machine condition.

2. Calibration Mode:
This program mode contains ten function modes and provides information which should be used to adjust and confirm system/component functions after replacement of electronic control system components. This program mode is also used to help the mechanic troubleshoot the machine problems.

To activate the program mode functions use the control switches provided on the electronic monitor panel.

NOTE: Unexpected character display readings due to random operation of switches should be disregarded.

To select a desired function mode, first start the proper service program mode (see the section "Data Mode Start-up" and/or "Calibration Mode Start-up"). Then operate the control switch(es) as specified, until the desired information is indicated on the character display.

When the selected service program function is no longer needed, use the proper procedure (see the section "Data Mode Stop Procedure" and/or "Calibration Mode Stop Procedure") to cancel.

Calibration Mode
NOTE: The procedures for each function in "Calibration Mode" are independent of each other. The engine does not need to be running for all the functions listed in the following chart. The following chart lists the functions in "Calibration Mode" and whether the engine must be running for each of the functions:


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Calibration Mode Start-up

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Electronic Monitor Panel (Calibration Mode Start-up)
(1) Engine coolant temperature gauge. (2) Fuel gauge. (3) Action lamp. (4) Character display. (6) Hydraulic oil temperature gauge. (8) Air heater indicator. (9) Charge alarm indicator. (10) Engine coolant temperature alarm indicator. (11) Hydraulic oil temperature alarm indicator. (12) Engine oil pressure alarm indicator. (13) Controller alarm indicator. (14) Monitor alarm indicator. (37) Service switch.


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NOTICE

Before to starting the Calibration Mode, the engine speed dial switch should be set at dial position "1" and the engine start switch must be in the OFF position.


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1. Depress service switch (37) and start the engine. As shown in the chart above, the engine does not need to be started to obtain information for certain functions in the "Calibration Mode".

2. Continue to depress service switch (37) until action lamp (3) comes ON and character display (4) displays [12H] or [11H]. All the alarm indicators except character display (4) will turn OFF.

3. The "Calibration Mode" is now accessed and character display (4) displays the first of the 10 functions (machine and engine model numbers) as shown in the chart above. Action lamp (3) remains ON during all calibration function modes.

NOTE: Activation of the "Calibration Mode" overrides the AEC function and keeps the power shift pressure constant at a pressure level equivalent to a no-load condition. The engine speed dial switch works normally.

NOTE: Activation of the "Calibration Mode" overrides the function of engine coolant temperature gauge (1), fuel gauge (2), action lamp (3), hydraulic oil temperature gauge (6), air heater indicator (8), charge alarm indicator (9), engine coolant temperature alarm indicator (10), hydraulic oil temperature alarm indicator (11), engine oil pressure alarm indicator (12), controller alarm indicator (13), and monitor alarm indicator (14).


Calibration Mode Function Selection

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Electronic Monitor Panel (Function Selection)
(3) Action lamp. (4) Character display. (17) Power mode selector switch. (22) Light switch. (28) Travel speed control switch. (31) AEC switch. (35) Wiper switch.
Power mode selector switch (17), light switch (22), AEC switch (31), wiper switch (35), and travel speed control switch (28) are pushed each time to obtain one of the following ten function modes:



Automatic Governor Actuator (G/A) Calibration


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NOTICE

The hydraulic oil temperature must be at the normal operating temperature before this calibration procedure is performed.


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NOTE: This procedure must be performed any time the governor actuator or controller has been replaced or reinstalled.


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Electronic Monitor Panel (Automatic Governor Actuator Calibration)
(4) Character display. (26) Travel speed HIGH (Rabbit) indicator. (28) Travel speed control switch. (31) AEC switch. (34) Washer switch. (36) Alarm cancel switch.
1. Start "Calibration Mode". See the section, "Calibration Mode Start-up".

2. Depress travel speed control switch (28) until travel speed HIGH (Rabbit) indicator (26) comes ON.

3. Depress and hold AEC switch (31) then depress and hold washer switch (34). Character display (4) displays [AC] in a flashing mode.

4. While still depressing AEC switch (31) and washer switch (34), depress alarm cancel switch (36) until character display (4) stops flashing and changes to [ACP]. The automatic calibration mode is now started and the governor actuator motor has moved to the initial high idle stop position. The governor actuator is now calibrated to the factory engine rpm setting designated for position "10" of the engine speed dial switch.

5. Once character display (4) displays [ACt], the calibration procedure can be completed.

6. Depress AEC switch (31) and washer switch (34) in sequence until character display (4) displays [AC1]. The calibration procedure for the factory engine rpm setting designated for positions "1" through "10" of the engine speed dial switch is now started. The calibration procedure from this point takes approximately two minutes. Character display (4) will change as follows:

* [AC1]
* [AC2]
* [AC3]
* [AC4]
* [AC5]
* [AC6]
* [AC7]
* [AC8]
* [AC9]
* [AC0]
When [AC0] appears in character display (4), the calibration procedure is complete.

NOTE: If the data is not correct or within specified limits, character display (4) will indicate an error code as shown in the following chart:


graphic





NOTE: If the error code [- 1], [- 2], [- 3], [-15], or [-16] is indicated on character display (4), readjust the accelerator/decelerator cables. See the section "Adjustment After Replacement Of Major Components".

NOTE: If the error code [- 4] through [-12] or [-14] is indicated on character display (4), check the corresponding checking procedure in the section "Checking Procedures (Electronic Control System)".

NOTE: The character display reading [-52] will change to another code as a guidance to adjust the accelerator cable screw. When the code [ 10] is displayed, the "1" position represents the number of turns to rotate the adjusting screw to tighten the accelerator cable.

NOTE: The character display reading [-53] will change to another code as a guidance to adjust the accelerator cable screw. When the code [ 10] is displayed, the "1" position represents the number of turns to rotate the adjusting screw to tighten the accelerator cable.

7. Stop "Calibration Mode" (unless another function selection is desired). See the section, "Calibration Mode Stop Procedure".

 

Let me know if the images are wrong, I will try to clear up any questions you have.

The switches could be different on gray market but, the service switch is the key.

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