RETAINER 8G4963 - Caterpillar

Illustration 1 g03072197
Cab (1) Joystick (swing and stick) (2) Joystick (boom and bucket)Movement of joystick (1) or joystick (2) is converted to a pulse width modulated signal (PWM). The PWM signal is received by the machine ECM. The machine ECM communicates with the ACS valve ECM's via a CAN data link. The ACS valve ECM sends a PWM driver to the proportional solenoid valves that are mounted on the main control valve. The proportional solenoid valves control the pilot oil flow that shifts the main control valve spools. The main control valve spools direct the flow of hydraulic oil to the implements.Movement of the joysticks causes movement of the implements.
Illustration 2 g03465538
Right-hand joystick (3) Handle (4) Electronic controlHandle (3) is mounted to electronic control (4) . When handle (3) is moved from the neutral position, a PWM driver is sent to the machine ECM from electronic control (4) . The machine ECM detects the amount of movement of handle (3) . The machine ECM sends a signal via CAN data link to the ACS valve ECM. The ACS valve ECM then sends a PWM driver to the proportional solenoid valves on the main control valve. Implement speeds and directions are proportional to the amount of movement of the handle.
Table 1
Signal     Minimum Value     Maximum Value    
Frequency     450 Hz     550 Hz    
Duty Cycle     2 %     98 %    
Table 2
Voltage Output    
Position of Joystick     Voltage    Duty Cycle    
Full Forward     1.2 to 1.9 DCV     5%    
Full Rear     7.5 to 8.1 DCV     95%    
Neutral     4.3 to 4.9 DCV     50%    
Full Left     1.2 to 1.9 DCV     5%    
Full Right     7.5 to 8.1 DCV     95%