Troubleshooting - Atlas Copco LH 11 Instrucciones De Seguridad Y De Funcionamiento

LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E

troubleshooting

Problem
Breaker does not work.
Pressure is not built
up when trigger is
activated
Breaker does not
work. Pressure is built
up when trigger is
activated
Breaker runs weakly or
irregularly
Hoses pulsate
Oil leaking from breaker Seals defective
Working tool falls out
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Cause
No or incorrect flow/pressure
P and T hoses interchanged
Insufficient activation of trigger valve Adjust trigger lever (if adjustable) or
Seals defect in spool channel of
valve housing
Back pressure too high
Quick-release coupling in return line
defective
Striking piston sticks, possibly due to
thickening of cylinder
Spool/reversing spool or auxiliary
spool sticking
Seals defective
Insufficient flow
Seals defective
Wear, internal leakage
Accumulator defective
Worn latch
Worn chisel bushing or tool
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No. 3392 5010 83 f
Safety and operating instructions
Solution
Check flow/pressure by means of test
equipment
Check connection. Standard connection
has oil flowing from male quick-release
coupling (i.e. the tail-hose of the breaker P
connection is fitted with female coupling)
replace defective parts
Dismount, check and replace seals
Make direct tank connection. Max.
back pressure 10-15 bar (150-200 psi)
measured at breaker
Locate and replace defective coupling
Push the breaker hard against the
working tool
Chamfer/polish the edge slightly at the
cylinder dashpot (where the cylinder bore
changes size)
Check oil viscosity. Thin oil increases the
risk of thickening
Dismount and check that all parts move
easily. Polish slightly if necessary
Dismount, check and replace
Check flow/pressure
Replace seals
Dismantle, check and replace defective or
worn parts
Check impurity of oil and oil viscosity at
working temperature
Thin oil = increased internal leakage
Replace accumulator diaphragm and
charge with nitrogen
Replace seals
Replace latch and roll pins
Replace bushing or tool
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2007-03-06 17