Operation
IMPORTANT: Before attempting to lift, ensure the hook is directly above the point
of lift, and the point of lift is directly above the centre of gravity on the load.
Select the required jib arm length according to the load to be lifted and access
available. Always use the shortest jib length possible to give the greatest safety
margin and stability. Lock the jib extension into position with the link pin ( Item 13),
and ‘R’ clip (Item 20).
To raise the jib arm, screw the large valve knob (Item B), on the hydraulic ram, fully
clockwise to close the control valve. Pump the hydraulic handle slowly to take
the weight, check the stability of the load before pumping the jib up to the desired
height.
To lower the jib, slowly unscrew the valve knob (item B), the more the valve is
released, the faster the load will lower.
T
ake care when lowering heavy loads
Maintenance
1.
Always inspect the crane before use for visible signs of damage, leaking
hydraulic fluid, loose, worn or missing parts.
2. Periodically check the crane for any damage, such as bent, loose or missing
bolts and pins. Do not use a damaged crane. The bolts and pins used in the
crane are specially designed for use, at the cranes’ rated capacity. If
replacements arerequired, contact CLARKE International Spares Department.
Do not use substitute components.
3. Lubricate all the moving parts monthly with a general purpose oil or grease as
appropriate. Keep a light film of oil on the ram to prevent rust.
4. If the jib does not reach its full height, check the ram hydraulic oil level as
follows:
a. Raise the jib to the horizontal position and support the end.
b. Remove the ram to jib link pin (item 11).
c. Lower the ram fully by unscrewing the large valve knob (Item B). With the ram
in the fully retracted position, the oil should reach the level of the vent plug.
Top up if necessary with Clarke hydraulic oil (part number 3050830).
NOTE: We recommend that the hydraulic oil is changed after every 100 hours
of operation.
5. Replace the vent plug and re-attach the ram to the jib.
NOTE: When not in use, the crane should be stored with the jib in its lowest
position so there is no load on the ram, and the ram is not xposed to
the elements.
If the crane is to be stored, or transported horizontally, the transit plug must
be fitted to avoid leakage.
