Boom
maintenance - Adjustments
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Boom dampers - H/D 20 + 24m only
The first fold rams attached to the
back frame are fastened through "Belleville" washers to
absorb shock loads. If these start to flatten out or crack, they must
be replaced immediately.
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Anti-yaw adjustment
The boom is fitted with an anti-yaw
device to damp out any yawing movements of the boom.
As the nylon wear plates begin to
wear the play will increase, replace as necessary.
There are also
"Belleville" washers inbetween the plates that the wear
pads are fastened to, again these must be replaced immediately if
they flatten out or start to crack. |
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Boom folding
If you do not have adequate
clearance between the booms and the front supports when folding the
booms, firstly ensure that the sliding frame and the anti-yaw device
are both adjusted correctly and then adjust the main fold rams as below.
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Main fold rams
The main boom fold rams should be
adjusted so that the booms just touch the front inner boom support
plates when the booms are in the fully closed position. If the booms
are forced too hard against these plates when you fold the booms,
damage will eventually be caused.
If adjustment is necessary check
there is no hydraulic pressure in the ram then slacken off the
lock-nut on the ram rod (fig. 31) and turn the ram rod with a
suitable spanner. |
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