SERVICE & ADJUSTMENTS
6 - 11
Issued: August 2003RT700 Series
C
D
GAP
BOOM CHAIN ADJUSTMENT
- 4 SECTION BOOM -
SAG
FOURTH SECTION EXTEND AND RETRACT
CHAINS (4 SECTION BOOMS):
1. Fully retract the boom.
2. Measure the gap between the front of third section and
the back of the tip section. This gap should be .25 inch
to .38 inch.
3. If adjustment is required, extend the boom approxi-
mately 1/2 way.
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 C will be under tension and D will be
free. After retracting the boom, adjustment D will
be under tension and C will be free.
4. If the gap is less than .25 inch, loosen adjustment D and
tighten adjustment C until the gap is within specifica-
tions.
5. If the gap is more than .38 inch, loosen adjustment C
and tighten adjustment D until the gap is within specifi-
cations.
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 C and D equal amounts until the measure-
ment is within specifications.
10. If the dimension is less than 2.75 inches, tighten adjust-
ments C and D 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 sec-
tion to the top of the extend chain.
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