Komatsu Utility 395F6001, Operation & Maintenance Manual

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MAINTENANCE PLAN
220
4.7.8.h CHECKING THE CHAINS FOR OXIDATION (Only for the 3-section boom version)
DANGER
• This is a visual check and must be performed when the
chains are moving slowly. Keep your hands away from the
chains.
• At the end of this check, before using the machine, or in
any case before retracting the boom sections, reassemble
and fasten all the chain protection guards.
Failure to comply with these instructions can lead to se-
vere hazard.
• The presence of oxide or powder oxide in the lubricant in-
dicates that a chain is corroded and has therefore lost its
safety characteristics as defined by the manufacturer.
If this defect is noticed, contact your Komatsu Utility Dealer
immediately for a thorough inspection and, if necessary,
have the chain replaced.
Select the WORK operating mode and position the machine on
level ground, with boom sections fully retracted and lowered,
frame levelled (if the relevant device is provided), parking brake
applied and stabilizers (if provided) lowered to the ground.
NOTE
• If the machine is not equipped with stabilizers, place a
safety block in central position under the front part of the
frame.
This is a visual check and consists in spotting signs of oxidation
on the extension and retraction chains.
For the inspection, proceed as follows:
1 - Remove the screws and the rear cover (1) of the main boom
section (2).
2 - While the operator slowly extends the boom sections, inspect
the side links of the retraction chain (3) and the sides of the
rollers; the presence of lubricant with traces of oxide, or, even
worse, of oxide only, means that the chains need the mainte-
nance operations that must usually be performed EVERY
500 HOURS.
The same check must be carried out also on the boom extension
upper chains (4), by proceeding as follows:
1 - With boom sections completely extended, stop the engine.
2 - Remove the screws (5), the grease nipple (6) and the casing
(7).
3 - Remove the guard (8).
4 - Inspect the extension chains (9) for traces of oxidation;
the presence of lubricant with traces of oxide or of oxide only
means that the chains need the maintenance operations that
must usually be performed EVERY 500 HOURS.
ATTENTION
• Do not lubricate oxidized chains, as the lubricant promotes
the re-penetration of the ejected oxide and increases wear
on the driving rollers and the joint.
RKAA1522
1
2
RKAA1930
3
RKAA1612
5
7
6
RKAA1641
8
9