FAN AR-VARIABLE 3599383 - Caterpillar

Introduction
Proportional Hydraulic Modulation Valves (PHMV) control the oil flow from the front pump and rear pump to the work tool. The C-T PHMV can be adjusted to control the amount of back pressure to a work tool or implement. The advantages to adjusting the back pressure are improved controllability when a heavy work tool is installed, can reduce cylinder speed for better controllability, and can help avoid a vacuum condition in the cylinder.The following can have the back pressure setting adjusted:
Boom DOWN
Stick IN
Bucket CLOSE/OPEN
Attachment Valve #1 EXTEND
Attachment Valve #1 RETRACT (If work tool is two-way flow)Note: After setting the back pressure, do NOT touch any implement levers for 5 seconds.Machine Preparation
The following procedures must be completed before performing the calibration.
Perform the main control valve calibration. Refer to Testing and Adjusting, "Main Control Valve - Calibrate" for the machine.
Perform the attachment #1 valve calibration. Refer to Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Attachment Valve #1)" for the machine.
Perform the Variable relief valve calibration. Refer to Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Variable Relief Valves)" for the tool control system for the machine.
Start the engine.
Increase the hydraulic oil temperature to 55° 5°C (131° 9°F). Calibration Procedure
Table 1
Default Back Pressure Values
Boom DOWN 10
Stick IN
Bucket CLOSE/OPEN
Attachment Valve #1 EXTEND
Attachment Valve #1 RETRACT(1) 6
(1) If work tool is two-way flow
Table 2
Back Pressure Setting Amount
10 Lowest amount of back pressure
1 Highest amount of back pressure Use any of the following control inputs (A) shown in Illustration 1 to calibrate the PHMV.
Illustration 1 g03366023
Electric Control Inputs for extension of the attachment control valve
(LJ) Left-hand joystick
(RJ) Right-hand joystick
(A) Thumb wheel (Forward)
(A) Switch
Select the work tool that will be attached to the machine. Reference: Refer to Testing and Adjusting, "Work Tool - Select" for the Tool Control System.Reference: Refer to Testing and Adjusting, "Work Tool Parameter - Program" for the Tool Control System.Monitor Procedure
The following procedure will allow the user to adjust the back pressure setting using the monitor.
Table 3
Back Pressure Setting
Operation Monitor Setting
Boom DOWN "BM Back Press Setting"
Stick IN "ST Back Press Setting"
Bucket CLOSE/OPEN "BKT Back Press Setting"
Attachment Valve #1 EXTEND "ATCH #1 Back Press EXT"
Attachment Valve #1 RETRACT(1) "ATCH #1 Back Press RET"(1)
(1) If work tool is two-way flow
Illustration 2 g02293918
Enter the "Service" Menu in the monitor. Enter password "9992".
Illustration 3 g02294054
Select "Tool Programming" from the "Service" menu.
Illustration 4 g02294076
Select the appropriate Tool from the "Tool Programming" menu.
Illustration 5 g03647842
Press the arrow keys on the monitor until the appropriate setting is selected. Refer to Table 3 for the operation. Press the "OK" key.
Using the arrow keys, adjust the back pressure setting between 1 and 10. Refer to Table 1 for the default values of the appropriate setting. Press the "OK" key. Do not touch any implement levers for 5 seconds.
After 5 seconds, operate the function to ensure that the desired cylinder or work tool speed is met.
If the desired speed is not met, repeat Steps 4 through 6 until desired cylinder or work tool speed is met.
Once the desired cylinder or work tool speed