Gradall 534B (9020-7317) Service Manual - Manual (Page 47)

This section highlights some common procedures
and discusses areas which may be new to even the
experienced operator.
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
Feather is a technique of control operation used for
smooth load handling. To feather controls, move
control lever very slowly until load begins to move,
then gradually move lever further until load 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
lowering engine speed at beginning and near end of
load movement.
Boom Control Lever
The boom control lever can be positioned to cause
individual boom movements or combinations of
boom movements as illustrated.
With boom raised above horizontal, forks can be
inserted under a load by moving boom control lever
forward and to the right until forks move forward
horizontally.
O P E R AT I N G P R O C E D U R E S & T E C H N I Q U E S
With boom raised above horizontal, forks can be
remove from a load by moving boom control level
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 lever
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 lever
forward and to the left until forks move rearward
horizontally.
The closer the boom to horizontal, the less boom
raise/lower movement required for inserting and
removing forks.
Carriage Tilt/Machine Level Lever
Move lever forward to tilt forks down and move
lever to rear to tilt forks up.
Move lever to left to tilt main frame to left and move
lever to right to tilt frame to right.
Always move boom to carry position
(horizontal or below) before leveling
frame. Attempting to level machine with
boom raised may cause it to tip over.
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