FOREST CRANE PALMS 840
V 1.03 EN 2012 Palmse Mehaanikakoda LLC 22
6. OPERATING INSTRUCTIONS
6.1 Testing
Ensure that the control valve levers are in the middle position. Swich on the pump and let
oil flow through the valve for a while. Lower the support legs.
Ensure that there are no people or obstacles in the operating area. The
danger zone is 20 m!
Carefully drive crane movements one by one in the way, that all cylinders reach their
extreme positions and repeat this until all movements are smooth.
Be careful when getting air out of system. If you drive cylinder to its extreme
position at full force, the air pressure in the cylinder will damage the seals!
Be extremely careful, when there is air in the cylinders!
After testing forest crane, inspect connections and repair leaks if any appeared. Check the
mounting bolts of the crane and support leg, tighten them if necessary. Check the hydraulic
oil level, and fill up if necessary.
6.2 Practice runs
Forest crane should not be operated if temperature is below -25C. Note that
the hydraulic seals, hoses and steel structures may get damaged at low
temperature. When starting to work at cold temperature, first let the oil flow
freely through the valve for a couple of minutes. The maximum operating
temperature for hydraulic oil is +75C.
Drive through every movement with an unloaded crane, paying attention to the positions in
which the crane might hit surrounding obstacles.
Never move the boom to its extreme position at full speed!
Move the control levers smoothly and stoutly, avoiding quick and jerky movements.
Learn to use several functions simultaneously. Start at low engine speed to avoid sudden
movements. After you have become accustomed to the crane’s movements, choose
appropriate engine speed so, operations are smooth and efficient, but you still have the
movements under control. Loading big and heavy logs from distance, keep load close to
the ground. When reaching the trailer, lift it up to load. When unloading do vice versa.
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