Maintenance -
Boom adjustments
Boom adjustments
Various areas of the boom may need
adjusting from time to time as wear naturally takes place. It is
important to keep the boom adjusted correctly to get the best life
and performance from it.
You should also thoroughly inspect
the boom from time to time for any signs of fatigue or cracking. It
is much easier to repair a cracked boom than it is a broken one.
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Height mast / slide frame
It is important that movement
between the sliding frame and the height mast should be kept to a
minimum. If the movement becomes too great the booms will not clear
the front supports by an adequate margin when you are folding them in There are nylon wear pads in between the height mast and slide frame, 4 at each side. Check that these are O.K. then adjust the slide frame with the two adjustable slides fitted to the offside of the frame, one at the top and one at the bottom (see right) |
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Adjust as follows:
1) Slacken off the
two set studs securing the top bracket to the frame.
2) Slacken off the locknut on the
adjusting bolt.
3) Turn the adjusting bolt to push
the slide bracket up to the height mast - do not over tighten.
4) Tighten the two securing studs
and the adjuster bolt locknut.
5) Repeat with the lower bracket.
6) With the booms open lift the
boom up and down to check that the carriage does not bind. If it does
slacken the slides off slightly and try again.
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Boom dampers.
The main boom sections are
suspended on damper units to absorb shock loads. After initial use
and from time to time afterwards the booms may start to sag.
If so slacken off the locknut shown
on fig. 25 and turn the damper to shorten the overall assembly
length. When set at the required level remember to tighten the locknut. These dampers should be checked regularly to ensure that they are working correctly by "bouncing" the boom up and down by hand and checking that the suspension action is still working. If it is not then the shock loads will be carried down the boom resulting in the booms cracking. Replacement units are available from your supplier or T.J. Frazier. |
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