7.5. LEVELLING OF THE BOOM ARM
1. First check the position of the levers on the arm shaft ( Fig. 24, page 28).
2. Close the barrier to put the arm in its horizontal position.
3. On the connecting rod ( Rep. 20, Chap. 5.1, page 9), loosen nuts (1) and (2).
One nut has a left-hand thread and the other one a right-hand thread.
4. Turn the connecting rod in the clockwise direction to make the arm rise and anti-clockwise to make it descend. Check the
arm’s horizontality by means of a spirit level.
5. Tighten the nuts.
3
1
20
2
3
Fig. 28 - Connecting rod assembly
32
BL 229
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