SkyTrak 6036 Service Manual - Manual (Page 29)

Section 3 Boom
Model 6036/6036T S/N 9B0500 thru 14833 3-11
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 intermediate boom at their closest point,
Fig. 3.12. Acceptable boom extend chain sag
is between 1-1/2 & 2-1/2" (38 & 64 mm). If the
measurement is less than 1-1/2" (38 mm),
adjust the boom chains as described in the
following steps.
(c) Measure the chain sag, Fig. 3.12. Accept-
able boom extend chain sag is between
1-1/2 & 2-1/2" (38 & 64 mm). If the chain
sag is less than 1-1/2" (38 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 1-1/2 and 2-1/2" (38
and 64 mm). If chain sag is less than 1-1/
2" (38 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).
OA0511
RETRACT CHAIN
LOCKNUT
EXTEND CYLINDER
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, Fig. 3.11. If the
distance between the front edges of the
intermediate and inner booms is between
1-1/2 & 2-1/2" (38 & 64 mm) and the extend
chain is no closer than 1-1/2" (38 mm) from
the intermediate 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 64 mm):
(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).
Fig. 3.16 Boom Wear Pads
ANGLED
CUT
ANGLED
CUT
MA2070