Hydraulic breaker operates too slowly
ByRemedyCause
Carrier driverCheck the engine speed and/or mode stage of the carrier
and the operation pressure and adjust.
Check the carrier's pressure and the size of the restrictor.
Insufficient hydraulic oil delivery volume.
Carrier driverCheck the valve and open.Valve in pressure and/or tank hoses partly
closed.
Carrier driverCheck the oil filter and oil cooler, clean or replace them.Flow resistance on oil filter or oil cooler too
high.
Carrier driverCorrect the direction of the carrier boom. The pressing force
must act in the axial direction of the hydraulic breaker.
Check the shaft of the working tool and deburr if required.
Use the right type, and amount of grease. Always use Atlas
Copco chisel paste.
Check the working tool and the wear bush for wear and
replace if necessary.
See section "Working tool".
Working tool jams in the lower breaker part.
WorkshopCheck the inside diameter and change if necessary.
Observe the minimum inside diameter!
See section "Hoses and connections".
Inside diameter of tank hose too small.
Atlas Copco Customer
Center/Dealer in your area
Check and lower the return pressure.Return pressure too high.
Carrier driverCheck the oil level in the hydraulic tank and top up if
necessary.
Check the oil flow. Too high oil flow leads to a higher working
pressure and temperature, and that the oil flows over the
pressure limiter.
Check the cooler function on the carrier.
See section "Preparation before breaking".
Hydraulic oil temperature in the tank higher
than 80°C (176°F).
WorkshopCheck the pressure, adjust as required. Fit new pressure
relief cartridges if necessary, on carrier and breaker.
Check the installation, check the restrictor, and check the
carrier's pressure.
See section "Pressure adjustment".
Hydraulic oil pressure too low.
Operating temperature too high
ByRemedyCause
Carrier driver or workshopCheck the oil level and top up oil.Oil level in tank too low.
Carrier driverCheck carrier engine speed and lower.Carrier's pump delivery too high, a constant
volume of oil is squirted out of the pressure
relief valve.
Atlas Copco Customer
Center/Dealer in your area
Check carrier settings and adjust.
Workshop or Atlas Copco
Customer Center/Dealer in
your area
Check oil temperature and install an oil cooler if necessary.Operation in high outside temperature
without oil cooler.
WorkshopFit new pressure relief cartridges.Pressure relief valve defective or valve with
poor characteristic.
25© 2015 Construction Tools PC AB | No. 9800 1273 01d | 2015-12-30
Original instructions
Safety and operating instructionsSB 702, 1102
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