Gradall G6-42P (91404003_Before 0160004017) Operation Manual - Manual (Page 28)

Hydraulic Controls
All boom and attachment movements are governed by hydraulic controls. Rapid,
jerky operation of hydraulic controls will cause rapid, jerky movement of the
load. Such movements can cause the load to shift or fall or may cause the
machine to tip over.
Feathering
Feathering is a control operation technique used for smooth operation. To feather
controls, move control lever very slowly until function begins to move, then
gradually move lever further until function is moving at desired speed. Gradually
move lever toward “Neutral” as load approaches destination. Continue to reduce
load speed to bring load to a smooth stop. Feathering effect can be increased
by reducing engine speed at beginning and near end of load movement.
Boom Control Joystick
The boom control joystick can be positioned to activate individual boom
movements or combinations of boom movements as illustrated:
Figure 13-1
With boom raised above horizontal, forks can be inserted under a load by moving
boom control joystick forward and to the right until forks move forward
horizontally.
With boom raised above horizontal, forks can be removed from a load by moving
boom control joystick back and to the left until forks move rearward horizontally.
With boom lowered below horizontal, forks can be inserted under a load by
moving boom control joystick back and to the right until forks move forward
horizontally.
With boom lowered below horizontal, forks can be removed from a load by
moving boom control joystick forward and to the left until forks move rearward
horizontally.
The closer the boom is to horizontal, the less boom raise/lower movement
required for inserting and removing forks.
Carriage Tilt Controls
Figure 13-2
OPERATING PROCEDURE & TECHNIQUES 13.0
WARNING !
Do not permit lift cylinder to hit
the end of stroke. The jolt could
topple loads, causing a hazard to
personnel and equipment nearby.
WARNING !
Always move boom to carry
position (horizontal or below)
before leveling frame. Attempting
to level machine with boom raised
could cause it to tip over.
NOTE!
Much of the material in this
section may be new to even the
experienced operator.
LOWER
BOOM LOWER &
EXTEND
BOOM
EXTEND
BOOM
RAISE &
EXTEND
BOOM RAISE
BOOM
RAISE &
RETRACT
BOOM
RETRACT
BOOM
LOWER &
RETRACT
BOOM
TILT
FORKS
UP
TILT
FORKS
DOWN
TILT
FORKS
UP
TILT
FORKS
DOWN
TILT
FORKS
UP
TILT
FORKS
DOWN
STANDARD OPTIONAL OPTIONAL
FRONT OF
MACHINE