NOTE: Before attempting to turn one of the adjusting nuts, extend or retract
the boom slightly to relieve the tension on that nut. After extending the boom,
adjustment 5 will be under tension and 6 will be free. After retracting the boom,
adjustment 6 will be under tension and 5 will be free.
4. If the gap is less than .25 inch, loosen adjustment 6 and tighten adjustment 5
until the gap is within specifications.
5. If the gap is more than .38 inch, loosen adjustment 5 and tighten adjustment 6
until the gap is within specifications.
6. Fully retract the boom and recheck the gap. Repeat step 3 through 5 if necessary.
7. Fully extend the boom horizontal.
8. Through the first hole in the side plate of the third boom section (the hole closer
to the second section), measure the sag of the retract chain. This measurement
must be taken from the bottom of the third section to the bottom of the chain.
This dimension should be 2.75 inches to 3.00 inches.
9. If the dimension is greater than 3.00 inches, loosen adjustments 5 and 6 equal
amounts until the measurement is within specifications.
10. If the dimension is less than 2.75 inches, tighten adjustments 5 and 6 equal
amounts until the measurement is within specifications.
11. Under the same condition, the maximum sag in the extend chain should be
7.00 inches to 7.50 inches. This measurement is from the bottom of the third
boom section to the top of the extend chain.
261REVISED:
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