TERMINAL AS-BLADE 2041297 - Caterpillar

Introduction
Proportional Hydraulic Modulation Valves (PHMV) control the oil flow from the drive pump and idler pump to the work tool. The bypass PHMV can be adjusted to control the maximum pressure of oil to a work tool. The advantages to adjusting the maximum pressure limit are reduced interference between multiple operations, and can reduce abnormal spikes in pump pressure during multiple operations.The following can have the pressure limit setting adjusted:
Attachment valve #1 drive pump pressure
Attachment valve #1 idler pump pressureNote: After adjusting the maximum pressure limit setting, do NOT touch any implement levers for 5 seconds.Machine Preparation
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
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.
Perform the main pump flow limit calibration. Refer to Testing and Adjusting, "Solenoid Valve (Proportional Reducing) - Calibrate (Main Pump Flow Limit)" 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 Pressure Limit Setting
Attachment #1 Pump #1 Maximum Pressure Limit Setting (Idler pump) 10
Attachment #1 Pump #2 Maximum Pressure Limit Setting (Drive pump)
Table 2
Pressure Limit Setting Amount
10 No amount of pressure bleed off (Bypass PHMV closed)
1 Highest amount of pressure bleed off (Bypass PHMV opened)
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 maximum pressure limit setting using the monitor.
Table 3
Pressure Limit Setting
Operation Monitor Setting
Attachment #1 Pump #1 Maximum Pressure Limit Setting (Idler pump) "Atch #1 Press Pump1"
Attachment #1 Pump #2 Maximum Pressure Limit Setting (Drive pump) "Atch #1 Press Pump2"
Illustration 1 g02293918
Enter the "Service" Menu in the monitor. Enter password "9992".
Illustration 2 g02294054
Select "Tool Programming" from the "Service" menu.
Illustration 3 g02294076
Select the appropriate Tool from the "Tool Programming" menu.
Illustration 4 g03648247
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 pressure limit setting between 1 and 10. Refer to Table 1 for the default values of the appropriate setting. Press the "OK" key.