RAMMER 255E, Operator'S Manual

Page: 56 / 68

COPYRIGHT © 2020 SANDVIK MINING AND CONSTRUCTION OY Page 56 - Maintenance
Troubleshooting 255E
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 27.
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.
FAILURE IN HAMMER VALVE OPERATION
The hammer must be serviced in an authorized Rammer service shop.
4.3 THE HAMMER OPERATES IRREGULARLY AND BLOW HAS NO POWER
THE WORKING METHOD IS NOT CORRECT
Refer to the correct working methods. See “Daily operation” on page 27.
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.
PRESSURE ADJUSTING VALVE SETTING IS INCORRECT
The hammer must be serviced in an authorized Rammer service shop.
PRESSURE LOSS IN PRESSURE ACCUMULATOR
The hammer must be serviced in an authorized Rammer service shop.
FAILURE IN HAMMER VALVE OPERATION
The hammer must be serviced in an authorized Rammer service shop.
4.4 IMPACT RATE SLOWS DOWN
OIL HAS OVERHEATED (OVER +80 °C/+176 °F)
Check for a fault in the oil cooling system or an internal leak in the hammer. Check
the hydraulic circuit of the carrier. Check the relief valve operation in the carrier.
Check the line size. Assemble an extra oil cooler.
HYDRAULIC OIL VISCOSITY TOO LOW
Check hydraulic oil. See “Requirements for hydraulic oil” on page 41.
EXCESSIVE BACK PRESSURE IN RETURN LINE
Check the installation. Check the size of the return line.