Snorkel MB20J, Operator'S Manual

Page: 14 / 32

2. Operation & Specifications
2 - 4
Figure 4: Lower Control Panel
1. Emergency Stop
2. KeySwitch - Platform Controls
- OFF
- Lower Controls
3. Analogue Rocker
4. Selector Switch - Jib
- Mast
- Mast Rotate
5. Enable Switch
6. Ez 230 Display
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.
!
!
Over-tensioning of either lifting chain will result in unnecessary lifting of
the mast.
This will lead to a subsequent increase in machine stowed height.
C A U T I O N
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