128
MAINTENANCE
When Required
Replacing the Rubber Crawlers
WARNING
If you must work beneath the raised
machine or equipment, always use
wood blocks, jack-stands or other rigid
and stable supports. Never get under
the machine or raised dump body if
they are not sufficiently supported.
If maintenance must be performed
with the engine running, always work
as a two-person team with one person
sitting in the operator’s seat while the
other works on the machine.
• When performing maintenance, be
sure to keep your body and clothing
away from moving parts.
Take great care in handling rubber
crawlers, because they are very heavy.
Stop the engine and allow the machine
to cool down before performing
maintenance.
• When disconnecting hoses, stand to
the side and loosen slowly to gradually
release the internal pressure before
removing.
Removal
If the tension of the rubber crawler cannot
be loosened, ask your dealer to repair or
replace the rubber crawler.
IMPORTANT: Prepare two wrenches
for removal and installation of hydraulic
hoses. Use one of the wrenches for
holding the hydraulic hose to prevent it
from twisting.
1. Set the machine to the hydraulic oil level
inspection posture.
Refer to page 103 “Inspecting the
Hydraulic Oil Level and Replenishing”.
2. Change the connecting locations of the
hydraulic hoses connected to the auto-
tension valve (1).
Changing the connecting locations of
the hydraulic hoses allows the tension
cylinder to be retracted and extended.
• Right rubber crawler :
Change the connecting locations of
the hydraulic hoses (2) and (3) for each
other.
• Left rubber crawler :
Change the connecting locations of
the hydraulic hoses (4) and (5) for each
other.
3. Start the engine and retract the tension
cylinder fully. Then stop the engine.
4. Jack up the machine so that a clearance
can be created between the core metal
protrusion of the rubber crawler and the
track rollers, and put wood bases or the
like between the crawler frame on its
lower side and ground.
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