Terex RT700 - Page 148

SERVICE & ADJUSTMENTS
6 - 10
Issued: August 2003RT700 Series
A
B
GAP
BOOM CHAIN ADJUSTMENT
- 4 SECTION BOOM -
BOOM CHAIN ADJUSTMENT: For proper operation and
boom life the extend and retract chains must be adjusted
properly. To adjust these chains use the following procedure.
THIRD SECTION EXTEND AND RETRACT CHAINS
(4 SECTION BOOMS):
1. Fully retract the boom.
2. Measure the gap between the front of second section and
the back of the third 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 ten-
sion on that nut. After extending the boom, adjust-
ment A will be under tension and B will be free.
After retracting the boom, adjustment B will be
under tension and A will be free.
4. If the gap is less than .25 inch, loosen adjustment B and
tighten adjustment A until the gap is within specifica-
tions.
5. If the gap is more than .38 inch, loosen adjustment A
and tighten adjustment B 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 second
boom section (the hole closer to the base section), mea-
sure the sag of the retract chain. This measurement must
be taken from the bottom of the second section to the
bottom of the chain. This dimension should be 2.25
inches to 2.50 inches.
9. If the dimension is greater than 2.50 inches, loosen
adjustments A and B equal amounts until the measure-
ment is within specifications.
10. If the dimension is less than 2.25 inches, tighten adjust-
ments A and B equal amounts until the measurement is
within specifications.
SAG