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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
9.3.5 De
.5 Derrick
rrick ing
ing mechanism
mechanism
Problem
Causes
Remedy
Problem
Causes
Remedy
Oil cylinder cannot
Oil cylinder cannot
be extended.
be extended.
Setting pressure of main relief valve is too
Setting pressure of main relief valve is too
low.
low.
Adjust
Adjust
Main
Main valve
valve has
has inner
inner oil
oil leakage.
leakage.
Rectify
Rectify
Oil
Oil cylinder
cylinder has
has inner
inner oil
oil leakage.
leakage.
Rectify
Rectify
Oil cylinder cannot
Oil cylinder cannot
be retracted.
be retracted.
Derricking-control
Derricking-control balance
balance valve
valve defects.
defects.
Rectify
Rectify or
or replace
replace
Setting pressure of relief valve of main valve
Setting pressure of relief valve of main valve
is too low.
is too low.
Adjust
Adjust
Oil cylinder
Oil cylinder
retracts
retracts
automatically.
automatically.
Oil
Oil cylinder
cylinder has
has inner
inner oil
oil leakage.
leakage.
Rectify
Rectify
Derricking-control
Derricking-control balance
balance valve
valve defects.
defects.
Rectify
Rectify
Содержание QY30V
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