RAMMER 255E, Operator'S Manual

Page: 57 / 68

Maintenance - Page 57 COPYRIGHT © 2020 SANDVIK MINING AND CONSTRUCTION OY
Troubleshooting 255E
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. Contact your
local dealer for more information.
LEAKAGE FROM PRESSURE TO RETURN IN EXCAVATOR HYDRAULIC CIRCUIT
Check the installation. Check the pump and the other hydraulic components.
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.
4.5 THE HAMMER DOES NOT STOP OR HAS RUN-ON
FAILURE IN HAMMER CONTROL VALVE OPERATION
Check the hammer control valve in the carrier.
4.6 OIL OVERHEATS
APPLICATION NOT CORRECT FOR HAMMER
Refer to recommended use and to correct working methods. See “Daily operation”
on page 27.
COOLING CAPACITY OF THE OIL COOLER IS TOO SMALL
Assemble an extra oil cooler.
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. Contact your
local dealer for more information.
HYDRAULIC OIL VISCOSITY TOO LOW
Check hydraulic oil. See “Requirements for hydraulic oil” on page 41.
LEAKAGE FROM PRESSURE TO RETURN IN EXCAVATOR HYDRAULIC CIRCUIT
Check the installation. Check the pump and the other hydraulic components.
INTERNAL OIL LEAK IN THE HAMMER
The hammer must be serviced in an authorized Rammer service shop.
EXCESSIVE BACK PRESSURE IN RETURN LINE
Check the installation. Check the size of the return line.