Farmi Forest Corporation 4670 Operation, Maintenance And Spare Parts Manual page 18

PRESSURE MEASUREMENT
Always make the adjustments with the manometer in
place.
• The main pressure is measured from the measuring
point in the control valve's inlet section.
• Adjustments and inspections for each movement:
• Set the main pressure relief valve to 5 bar
above the value set for the protective valve.
• Perform the movement, and check and adjust
the pressure if necessary.
• Finish by adjusting the main pressure to the
set value.
• Pressure measurements are to be performed at
the normal operating temperature and at the
normal flow rate.
• The free flow pressure can be read from the
manometer when the flow of oil is directed through
the valve.
FARMI 4670
REPAIR WELDING
If welding is required for modifying or repairing the
crane, note the following:
• Have welding work always performed by qualified
personnel; class C. Class B is only required for wel-
ding joints which must withstand high stress.
• Remove paint and any oil from the location to be
welded.
• Connect the ground terminal directly to the piece
to be welded – there must be no joints in between.
• Use OK 48.00 or equivalent electrodes. The
electrodes must be dry.
• Improperly welded structures can get fractured.
18