SkyTrak 6036 Service Manual - Manual (Page 27)

Section 3 Boom
3-9 6036/6036T S/N 9B0500 thru 14833
3.1.4 Chain Replacement
Two chains extend the inner boom and one chain
retracts it.
Extend Chains
IMPORTANT: Replace extend chains in pairs or
sets ONLY.
a. Removal
1. Fully retract the boom.
2. Remove the rear boom cover.
3. Refer to Fig. 3.11 and remove the extend chain
locknut and flat washer securing each chain
clevis to a block at the upper rear of the inner
boom.
4. Remove the locknut and shoulder screw that
attaches each extend chain to the yoke at the
front of the boom.
5. Pull the chains out the front of the boom.
6. Remove a chain clevis at both ends of each
chain.
b. Installation
1. Be sure the boom is fully retracted.
2. Install a chain clevis on both ends of each
chain.
3. Working from the rear boom cover opening,
remove both top intermediate boom wear pads
to gain access to rear boom chain connection.
4. Using a long rod or other suitable tool, route the
chains between the upper plates of the inner
and intermediate booms to the front boom
opening. Make sure chains are not twisted.
5. Route the chains over the chain sheave and
attach the chains to the front yoke with a
shoulder screw and locknut. Tighten the
locknut completely, then back off 1/4 turn.
6. Secure the rear of the chain to a block at the
upper rear of the inner boom with a flat washer
and locknut. The elastic collar on the locknut
must engage the chain clevis by at least one
full thread. Be sure locknuts are tightened
equally.
7. Check the position of the chain yoke at the
front of the outer boom. The front of the yoke
must be parallel to the front face of the outer
boom. If not, adjust the locknuts accordingly.
8. Refer to paragraph 3.1.5 and lubricate the
chain.
9. Refer to paragraphs 3.1.6 and 3.1.7 and check
and adjust the chains.
Retract Chain
a. Removal
1. Fully retract the boom.
2. Remove the rear boom cover.
3. On the underside of the outer boom, remove
the outer boom retract chain locknut and flat
washer, Fig. 3.11, securing the retract chain to
a chain support plate at the underside of the
outer boom.
4. Remove the inner boom retract chain locknut
and flat washer (S/N 2515 & Before) attaching
the retract chain clevis to a block at the lower
rear of the inner boom. For S/N 2516 & After
remove the shoulder screw and locknut from
the mount plates.
5. From the rear outer boom cover opening, pull
the retract chain from the space between the
outer and intermediate booms.
6. Remove a chain clevis from each end of the
chain.
b. Installation
1. Be sure the boom is fully retracted.
2. Install a chain clevis on each end of the chain.
3. Refer to paragraph 3.1.5 and lubricate the
chain.
4. Secure the rear of the chain to a block at the
lower rear of the inner boom with a flat washer
and locknut (S/N 2515 & Before). Route the
chain around the chain sheave. The elastic
collar on the locknut must engage the chain
clevis by at least one full thread. For S/N 2516
& After secure the chain clevis to the mount
plates with a shoulder screw and a locknut.
5. Using a long rod or other suitable tool, route the
chain between the lower plates of the outer and
intermediate booms to the chain support plate
opening, Fig. 3.11, on the bottom of the outer
boom.
6. Secure chain clevis to the chain support plate
using a flat washer and locknut. Torque the
locknut to 35 to 40 lb-ft (47,5 to 54,2 Nm).
7. Refer to paragraphs 3.1.6 and 3.1.7 and check
and adjust the chain.