SkyTrak 6036 Service Manual - Manual (Page 29)

Model 6036 S/N 9B0499 and Before 3-11
Section 3. Boom
Adjustment is accomplished using extend chain
adjustment locknuts, Fig. 3.14.
a. Chain Locknut Functions
Loosen extend chain locknuts to extend the inner
boom and increase extend chain sag.
Tighten outer boom retract chain locknut to retract
the inner boom and decrease extend chain sag.
b. Adjusting Procedure
1. Raise the boom to a horizontal (level) position.
Fully extend the boom, then retract it 2" which
is 1" per section (51 mm which is 25,5 mm per
section).
2. Measure sag in the extend boom chains
between the bottom of the chains and the top
of the inner boom at their closest point, Fig.
3.12. Acceptable boom extend chain sag is
between 3/4 and 1-3/4" (19 and 45 mm). If the
measurement is less than 3/4" (19 mm), adjust
the boom chains as described in the following
steps.
(a) Tighten the locknut, Fig. 3.15, on the
bottom of the outer boom. This retracts
the inner boom and takes up the sag in the
extend chains.
(b) Cycle the boom in and out; then, with the
boom horizontal (level), fully extend the
boom and retract it 2" which is 1" per
section (51 mm which is 25,5 mm per
section).
(c) Measure the chain sag, Fig. 3.12. Accept-
able boom extend chain sag is between 3/4
and 1-3/4" (19 and 45 mm). If the chain
sag is less than 3/4" (19 mm) repeat steps
(a) through (c).
3. If the distance measured in Step 1 is less than
2" but greater than 1-1/2" (less than 51 mm but
greater than 38 mm):
(a) Remove the rear cover from the outer
boom and adjust the top extend boom
chains.
(b) Tighten the locknuts, Fig. 3.14, for each
chain. Be sure each locknut is tightened
equally so that chain maintains the same
tension. Equal chain tension can be
checked by observing the position of the
yoke on the outer boom, Fig. 3.13. The
front of the yoke should be parallel with the
front edge of the boom.
(c) Cycle the boom in and out; then, with the
boom horizontal (level), fully extend the
boom and retract it 2" which is 1" per
section (51 mm which is 25,5 mm per
section).
(d) Measure the chain sag. Acceptable boom
chain sag is between 3/4 and 1-3/4" (19
and 45 mm). If chain sag is less than 3/4"
(19 mm), repeat steps (a) through (d).
(e) Replace the rear cover of the outer boom.
3.1.8 Wear Pad Replacement
After the first 50 hours of operation or when
severe wear is suspected
There are 26 wear pads (Fig's 3.3, 3.5, 3.6 and 3.8)
between the outer, intermediate, and inner booms.
Five are attached to the inner boom, thirteen to the
intermediate boom, and eight to the outer. Four
additional wear pads may be used in severe twist
applications.
The wear pads and wear pads with spacers are
shimmed to maintain a gap between the wear pads
and the booms of 0.07 to 0.13" (1,8 to 3,3 mm).
Fig. 3.15 Retract Chain Adjustment Locknut
3.1.7 Chain Tension Adjustment
1. Retract the boom completely to check the
position of the inner boom. If the distance
between the front edges of the intermediate and
inner booms is between 1-1/2 and 2-1/2" (38
and 64 mm) and the extend chain is no closer
than 3/4" (19 mm) from the inner boom,
proceed no further, the boom chains are
adjusted correctly.
2. If the distance between the front edges of the
intermediate and inner booms is 2" or more but
less than 2-1/2" (51 mm or more but less than
63 mm):
RETRACT CHAIN
LOCKNUT
EXTEND CYLINDER
OA0511