MAINTENANCE CD3340B/YB4411
5-20
Published 04/07/2015 Control # 569-00
Any cracking on V-belts is not acceptable. Replace any
V-
belt that has cracking. See Figure 5-32
Any ribbed belt or V-belt showing signs of wear or that has
material missing should be replaced. When a belt is
replaced, check its tension again after 30 minutes of
operation. New belts will stretch with use.
250 Hours of operation/Monthly
NOTE: You must read and understand the warnings and
basic safety rules, found in Section 1 of this
manual, before performing any operation or
maintenance procedures.
For additional engine maintenance guidelines, see
the engine manual furnished with this crane.
Inspecting the Boom Chains
1. Place the booms in the fully lowered position.
2. Extend the booms to expose all of the side access holes.
3. Visually inspect the chains through the access holes. A
light may be needed to see most of the chain. Look for
any damage to the chains.
NOTE: If chain damage is found during the inspection, DO
NOT USE THE CRANE. Cease operation and
replace the damaged chain before placing the
crane back in service. A damaged chain could
break, causing boom to not function properly.
Personal injury or property damage could result.
4. Damage could be any of the following:
a. A crack or complete break of a link plate, particularly
an outer plate on either side of the chain
(Figure 5-33).
b. Distortion or spreading of an outside link plate,
evidenced by increasing clearance between
overlapping link plates, or between the inner link
plates and the roller. This indicates a hidden break
in a pin (Figure 5-34).
c. Looseness between the riveted ends of a chain pin
and the outer link plates. If a pin is broken, the
normal rigid riveting may loosen, leaving a visible
clearance around the exposed ends of the pin
(Figure 5-35).
d. The pin head rivets should be examined to
determine if the V-flats are still in the correct
alignment. Chain with rotated or displaced heads or
abnormal protrusion (Figure 5-36) should be
replaced immediately.
a0589
FIGURE 5-32
V-Belt Inspection - General
Replace Belt
a0158
FIGURE 5-33
Cracked Plates
(Fatigue)
a0159
FIGURE 5-34
Link Plate Distortion
a0160
FIGURE 5-35
Clearance at
Riveted chain Pin
Reference Only
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