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Section 5 - Problems-Causes-Solutions
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PROBLEMS
CAUSES
SOLUTIONS
Problems
The attachment locking cylinder
doesn't work (if any)
The forks cannot be pitched
perfectly
The boom extension system doesn't
work
12
Causes
Brake pump damaged.
Brakes damaged or worn out.
Attachment locking cylinder damaged.
Quick couplings damaged.
The hydraulic line between control block
and quick couplings is defective.
Fork cylinder damaged.
Fork cylinder block valve damaged.
The hydraulic line between control block
and block valve is defective.
Safety valves not well calibrated or
damaged.
Extension cylinder inside the boom
damaged (third telescope extension), only
GTH 4013 EX.
External extention boom cylinder damaged
(second telescope extension)
Block valve of the boom internal extension
cylinder damaged (only GTH 4013 EX).
Block valve of the boom external extension
cylinder damaged.
GTH-4017EX GTH-4514EX GTH-4013EX
November 2008
Solutions
Check the pump thoroughly.
Check the efficiency of the disks;
replace, if necessary.
Check the efficiency of the cylinder;
r e p l a c e t h e i n t e r n a l s e a l s , i f
necessary.
Check and replace, if necessary.
Check and replace any damaged or
clogged hose.
Change the seals and check the
tightness of the cylinder.
Remove and clean the valve; check its
seals and replace if necessary.
Check and replace any damaged or
clogged hose.
Check the efficiency of the safety valves
fitted on the main valve; re-calibrate or
replace.
Check the seals of cylinder, rod and re-
sequencing valve (located at the top of
the rod); replace any defective parts.
Check the seals of cylinder, rod and re-
sequencing valve (located at the top of
the rod); replace any defective parts.
Check the valve, clean or replace if
necessary.
Check the valve, clean or replace if
necessary.
Document 57.0009.0427
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