the distance measures 10.31” (262 mm), the chain
should be discarded. DO NOT repair sections of a
chain. Replace the complete chain.
Chain anchors and sheaves also require inspection for
wear or broken fingers and worn flanges. If a chain has
been replaced, operate under load conditions and re-
check the torque. Adjust the chains per the following
procedure.
Extend the boom straight out to its maximum length.
Then retract the boom slowly until the chain slack
allows the chain to rest on the top of the boom. Torque
the chains on the front of the boom to 25 ft-lb (34 Nm).
Lubricate with 80/90 W oil.
CHECK BOOM SLIDE PADS
WEAR AND CLEARANCE
This boom is equipped with special nylon low friction
slide pads between the telescopic sections (see illustra-
tion). These are pre-greased and initially worn-in at the
factory. Normally greasing is not required, except for
itive jumper cable to the jumper battery positive (+)
terminal.
3. Connect one end of the negative (-) jumper cable
to the jumper battery negative (-) terminal.
4. Make the final negative (-) jumper cable connec-
tion to the disabled Telescopic Forklift’s engine block
or frame (ground) - NOT to the disabled battery nega-
tive post. If making the connection to the engine, keep
the jumper clamp away from the battery, fuel lines, or
moving parts.
NOTE: Twist the jumper cable clamps on the
battery terminals to insure a good electrical con-
nection.
5. Proceed to start the machine. If it does not start
immediately, start the jumper vehicle engine to avoid
excessive drain on the booster battery.
6. After the machine is started and running smoothly,
have the second person remove the jumper cables
(negative (-) jumper cable, first) from the jumper vehi-
cle battery, and then from the disabled machine while
insuring NOT to short the two cables together.
Allow sufficient time for the alternator to build-up a
charge in the battery before attempting to operate the
machine or shut the engine off.
NOTE: If the battery frequently becomes dis-
charged, have the battery checked for possible
dead cell(s), or troubleshoot the entire electrical
system for possible short circuits or damaged wire
insulation.
CHECK ALTERNATOR AND
FAN BELT TENSION
Refer to the engine manual for proper belt tension
adjustment and replacement procedures. If the belt
shows wear or cuts, it should be replaced. Order
replacement belt from your engine dealer.
CHECK BOOM LEAF CHAINS
AND SHEAVES
Inspect the leaf chains for wear and proper tension
(Model 553 only). Two of the chains and sheaves are
on the top of the boom. A third is accessible from
inside the rear of the boom (see illustration). Run the
boom out slowly to inspect. Conditions to look for
include cracked or broken plates, protruding or turned
pins, and excessive wear. With a steel tape, measure 16
links of the strand that flexes over the sheaves. When
Slide Pad Detail
Rear Inner
Shim
Pad
Front
Outer
908424/AP500 50 PRINTED IN U.S.A.
Chain Hookup Detail
Rear Chain Front Chain
Sheave Sheaves
Inner Section
Outer Intermediate
Section Section
Courtesy of Crane.Market
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