Upright MB20N/26 Betriebsanleitung Seite 11

6. Prior to operating the functions, check that the upper and lower emergency stop
buttons on each control station are retracted; turn clockwise if necessary. Carry out the
following function from the Lower Control Station.
NOTE: DO NOT enter the platform at this stage.
7. Check jib operation by extending the jib to its fully elevated position. Check for correct
routing of the hoses and cables. Check the Emergency Lowering feature of the jib.
Ensure that when the Emergency Lowering lever/button is disengaged, the jib no
longer descends. Return the jib to its rest position using the normal Lower Control
Station.
8. Check mast chains by elevating the masts approximately 30cm above the rest
position. Check for correct routing of the energy chain. Raise the masts to full height
and check for correct adjustment of each lifting chain as follows. Each chain in the pair
should bear load. Use a hand held spring balance or tensiometer apply a nominal load
(approximately 10kgf.) to either chain in the pair. Apply the load about half way up the
chain. Record the approximate deflection i.e. the offset distance from the mast.
Repeat the measurement on the adjacent chain at the same location. Chains bearing
equal load will deflect equal amounts. Carefully adjust the slack chain until the
deflections are approximately equal. Torque up the locknuts to 70 Nm.
NOTE: Apply a thin layer of grease to the lifting chains with a small paintbrush.
C A U T I O N
!
Over-tensioning of either lifting chain will result in unnecessary
lifting of the mast and a subsequent increase in machine stowed
height.
The function of the mast straps is to ensure that masts descend in the correct order
and more importantly, that masts cannot continue to descend if the jib or platform
meets an external obstacle. Raise the masts about 30cm. Check the external mast
clamp screws for tightness. Pull on the short length of each strap and check that they
are secure. Refer to the maintenance manual for instructions on more stringent
periodic checks on these straps.
Check the Emergency Lowering feature of the mast. The lever is located in the upper
mast over. Open the left hand battery inspection hatch and locate the 'Emergency
Lowering' decal label. Check the wear pads for damage or heavy scoring. Replace as
necessary.
9. Elevate the jib fully. Using the Lower Control Station, turn the mast assembly through
about 90 degrees. Check the correct routing of the hoses and cables and the correct
smooth operation of the energy chain in its chassis base slide. Continue rotating
through 180 degrees in both directions. Confirm that the rotation stops are intact.
10. STANDARD PLATFORM CONTROLS Repeat the mast, jib and rotate functions from
the Upper Control Station in the platform. Check that pressing the emergency stop
button prevents subsequent operation of the joystick.
3 S
AFETY
!
I
NSPECTION
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