Boom Extend And Retract Chains - JLG Lull 1044C-54 II Series Service Manual

Boom and Transfer

Boom Extend and Retract Chains

Boom Chain Inspection
6-106
a. Bring auxiliary and front carriage tilt hoses (Items 7 and 8) from
inside the middle (rear) boom section (Item 9) up and around the
two (2) hose reels (Item 19) at the rear of the middle (forward)
boom section (Item 3).
b. Connect the hydraulic hoses to the hydraulic tubes (Items 1 and 2)
at the rear of the inner boom section. Torque swivel nut on
hydraulic hoses to 50–58 ft-lbs.
c. Install hose guard (Item 4) on rear of inner boom section with two
(2) each lockwashers (Item 5) and capscrews (Item 6). Torque
capscrews to 280 ft-lbs.
CAUTION: Make sure hose guard is installed in the same orientation as it
was before being removed. The hose guard may be different
from that shown above. If hose guard is reversed, equipment
damage may occur during operation of machine.
d. Bring auxiliary and front carriage tilt hoses (Items 14 and 15) from
inside the outer boom section (Item 18) up and around the hose
rollers (Item 20) at the rear of the middle (rear) boom section.
e. Connect the hydraulic hoses to the hydraulic tubes (Items 10 and
11) at the rear of the middle (rear) boom section. Torque swivel nut
on hydraulic hoses to 50–58 ft-lbs.
46. Install assembled 4-section boom on machine as described on
page 6-62.
WARNING: Worn pins, stretched or cracked links or cracked links or
corrosive enviroments can cause chain failure.A chain failure
could result in uncontrolled boom movement, loss of load or
machine instabiltity, and could cause death or serious injury
and/or property damage.
Under normal operating conditions the extend chains will need to be inspected
every 250 hours of operation. The retract chain will need to be exposed and
inspected every 1000 hours of operation. Environmental conditions and dynamic
impulse/shock loads can drastically affect normal operating conditions and require
more frequent inspection intervals.
a. Expose Extend Chains for Inspection
1. Park the machine on level ground. Place the travel select lever in (N)
NEUTRAL, engage the parking brake switch and raise the boom to a
horizontal (level) position.
2. Lower both outriggers completely
3. Fully extend the boom until both extend chains are taut. Shut the
engine OFF.
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