Service Port Speed Limit Control; Background And Concept Of Rd; Hand-Control System; Speed Limit Function New Feature - Kubota KX080-3 Workshop Manual

WSM KX080-3 Mechanism
b. Service port speed limit control
1. Background and concept of R D
The hydraulic service port is provided to move an attachment that is installed on the machine. Such
attachment was operated with a foot pedal on conventional machines. For finely maneuvering an attach-
ment and saving the space around the operator s feet, the hand-control system was developed. Kubota s
3-ton and higher-capacity export machines are now standard equipped with this system.
The top-end model KX080-3 is also equipped with the speed limit function (the world s first on mini-back-
hoes) to differentiate this model from our competition.

Hand-control system

The hydraulic control grip has a small angle sensor built in. Signals from this sensor activate the propor-
tional solenoid valve to control the flow rate at the hydraulic service port stepless.
(1)
2. Outline of new function

Speed limit function New Feature

According to maximum necessary flow rate of an attachment, the working speed limit can be preset in 10
steps. Just look at the electronic meter s LCD screen and press the button.
What s more, the control knob angle and the service port flow rate are in linear response to each other.
The attachment can now be easily controlled by moving the control knob over its full stroke.
(1)
(2)
(3)
(1) Control knob (small angle sensor)
(2) Engine rpm
(3) Control angle input
(4) Electronic meter (control unit)
(5) Proportional solenoid valve
(6) Attachment
(2)
(3)
V-M-5
Hand-control system
(4)
(1) Extend
(2) Control button
(3) Retract
V Electrical System
(6)
(5)