Komatsu WA270-8 Service Manual

PCS (PROPORTIONAL CONTROL SWITCH)
PCS (Proportional Control Switch) is used to operate the third
attachment.
The amount of the hydraulic oil discharged by the switch opera-
tion is in proportion to the stroke of the switch.
The switch has 2 control modes; They are the fixed oil flow
mode and the proportional oil flow mode.
The maximum flow rate at the switching operation and the con-
trol mode can be changed on the machine monitor.
Position (A): RETRACT
Position (B): NEUTRAL
However, this position is for HOLD when switch is operated to limit of position (C) to enable the detent control in
the fixed oil flow mode.
Position (C): EXTEND
Fixed oil flow mode
The maximum flow rate which has been set is held when the
switch is operated to the limit of position (C), and the third at-
tachment continues the operation even if the switch operation
is stopped. This action is called the detent control.
Use this control when the installed attachment requires contin-
uous hydraulic oil flow.
The detent control operation pilot lamp (D) lights up during the
detent control.
The detent control is canceled by any of the following opera-
tions.
• Operate the switch again.
• Turn the work equipment lock switch to ON position.
• Turn the starting switch key to OFF position.
• Stop the engine.
• Cancel the fixed oil flow mode on the machine monitor.
Proportional oil flow mode
This mode does not have the detent control function which the fixed oil flow mode has.
REMARK
The hydraulic oil discharged volume is in proportion to the stroke of the switch in both the fixed oil flow mode
and the proportional oil flow mode.
LCD UNIT
(1) Oil flow control mode pilot lamp (fixed oil flow mode/propor-
tional oil flow mode)
(2) Detent operation pilot lamp
(3) Attachment oil flow level
ATTACHMENTS AND OPTIONS PCS (PROPORTIONAL CONTROL SWITCH)
6-15

Komatsu WA270-8 Specifications

General

Brand	Komatsu
Model	WA270-8
Category	Compact Loader
Language	English