Operating Levers/Pedals; General; Control Layouts; Excavator Arm Controls - jcb JS300 Service Manual

General

WARNING Make sure it is clear overhead before raising the boom. Keep an adequate safe distance from
all electrical power lines. Contact your local power company for safety procedures.
CAUTION Keep the machine controls clean and dry. Your hands and feet could slide off slippery controls.
If that happens you could lose control of the machine.

Control Layouts

WARNING Control lever/switch action may vary on machines, instructional labels near the levers/switches
show by symbols, which levers/switches cause what actions. Before operating control levers/switches check
the instructional label to make sure you select the desired action.
The control levers and switches may vary on machines.

Excavator Arm Controls

Introduction
NOTICE Do not excavate on hard or rocky ground with the boom positioned diagonally across the
undercarriage. The resulting rocking motion could cause damage to the track gearbox sprockets and tracks.
NOTICE When carrying out deep digging it is advisable to have the super structure swung in line with the
chassis. It is possible that part of the dig end may contact the machine. Take extra care when digging to
avoid damaging the machine.
The excavating is controlled mainly by the movements of the left and right excavator joystick controllers.
Many of the excavating movements are a combination of two (or more) movements at the same time, which
requires practice. Practice the movements singly at first and then in combination, until you are completely
familiar with the effects of all the controls.
Before you start to excavate, make sure that the controls isolation lever is down and the slew lock and isolator
switches are off.
Use the label on the front window to remind you of the operating patterns when you move the excavator joystick
controllers.
When the engine has stopped, there will be sufficient pressure available for a limited time to enable the boom/
dipper to be lowered to a safe position.
ISO/SAE Controls
This machine's operation conforms to the ISO operating method unless they have the ISO to SAE option
installed. With this option the machines excavating controls can be set to one of two operating patterns, ISO
or SAE.
These operating patterns are shown on a label on the front window. Use the DECU (Display Electronic Control
Unit) to select the different operating patterns.
ISO Pattern
Right Joystick
NOTICE In some instances it may be possible to hit the cab with the bucket or attachment. To prevent
damage care should be taken when operating with the bucket/attachment close to the cab.
The right hand joystick controls the movements of the boom and the bucket. When released, the joystick returns
to the neutral position.
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Operating Levers/Pedals

Refer to: Operation > Instruments > Instrument Panel (Page 65).
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Operation
Operating Levers/Pedals
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