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D i a g n o s t i c s
D i a g n o s t i c s
9.3
9.3.7 H
.7 Hoisti
oisti ng m
ng m echanism
echanism
Problem
Causes
Remedy
Problem
Causes
Remedy
Hook cannot be
Hook cannot be
lifted.
lifted.
Setting pressure of relief valve of main valve
Setting pressure of relief valve of main valve
is too low.
is too low.
Adjust
Adjust
Winch
Winch motor
motor defects.
defects.
Replace
Replace
Main
Main valve
valve defects.
defects.
Rectify
Rectify
Combination
Combination control
control valve
valve defects.
defects.
Rectify
Rectify
Winch
Winch brake
brake is
is not
not open.
open.
Rectify
Rectify
Hook cannot be
Hook cannot be
lowered.
lowered.
Setting pressure of relief valve of main valve
Setting pressure of relief valve of main valve
is too low.
is too low.
Adjust
Adjust
Winch
Winch motor
motor defects.
defects.
Rectify
Rectify
Main
Main valve
valve defects.
defects.
Rectify
Rectify
Combination
Combination control
control valve
valve defects.
defects.
Rectify
Rectify
Balance
Balance valve
valve defects.
defects.
Rectify
Rectify
Winch
Winch brake
brake is
is not
not activated.
activated.
Rectify
Rectify
Содержание QY30V
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