RAMMER 455, Original Instructions Manual

Page: 49 / 60

Maintenance - Page 49 COPYRIGHT © 2013 SANDVIK MINING AND CONSTRUCTION OY
Troubleshooting 455
4. TROUBLESHOOTING
4.1 THE HAMMER DOES NOT START
PRESSURE OR RETURN LINES CLOSED
Check the operation of quick couplings in hammer line. Open hammer line ball
valves if closed.
PRESSURE AND RETURN HOSES INSTALLED BACKWARDS
Swap the pressure and return hoses.
PISTON IS IN ITS LOWER HYDRAULIC BRAKE
Keep the hammer control valve open and force the tool against an object. The tool
head will push the piston out of its brake area. See “Daily operation” on page 23.
GREASE BETWEEN PISTON AND TOOL CONTACT AREA
Remove the tool and wipe excessive grease off. See “Manual greasing” on page 34.
HAMMER CONTROL VALVE DOES NOT OPEN
When operating the hammer control valve, check that the pressure line pulsates (this
indicates the hammer control valve is opening). If the valve does not operate, check
the operating means: mechanical connections, pilot pressure or electrical control.
RELIEF VALVE IN HYDRAULIC CIRCUIT OPENS AT A LOW PRESSURE. HAMMER OPERATING
PRESSURE IS NOT REACHED
Check the installation. Check the relief valve operation. Adjust the relief valve in
hydraulic circuit. Measure the high pressure in the hammer inlet line.
EXCESSIVE BACK PRESSURE IN RETURN LINE
Check the installation. Check the size of the return line.
LEAKAGE FROM PRESSURE TO RETURN IN EXCAVATOR HYDRAULIC CIRCUIT
Check the installation. Check the pump and the other hydraulic components.
FAILURE IN HAMMER VALVE OPERATION
The hammer must be serviced in an authorized Rammer service shop.
PISTON FAILURE
The hammer must be serviced in an authorized Rammer service shop.
4.2 THE HAMMER OPERATES IRREGULARLY BUT THE BLOW HAS
FULL POWER
NOT ENOUGH FEED FORCE FROM EXCAVATOR
Refer to the correct working methods. See “Daily operation” on page 23.