M A E D A Mini-Crawler Crane Section 5 – GENERAL MACHINE MAINTENANCE
1/2019 MC285C-3 5-61
Checking Rubber Track Tension
Rubber tracks wear differently depending on
working conditions and soil quality. Periodically
check for wear and measure tension of the rubber
tracks.
On a new machine or when new parts are
installed, initial slack occurs between 5 and 30
hours of operation. Inspect and adjust the tension
frequently during the initial slack period to prevent
the rubber track from falling off due to insufficient
tension.
1. Move the left and right crawlers so the
connection of the rubber track (M) comes to
the top centre between the axles.
Fig. 5-127
2. Set the outriggers and raise the tracks
approximately 80 mm from the ground. See
“OUTRIGGER SETTING” on page 4-38.
Fig. 5-128
3. Measure the clearance between the centre of
the track roller wheel tread and the shoulder
of the rubber track.
4. Standard tension of the rubber track is 5 to
10 mm clearance between the wheel tread of
the centre of the track roller and the shoulder
of the rubber track.
Fig. 5-129
5. If the tension is not within specification, see
“Adjusting Rubber Track Tension” on page
5-61.
Adjusting Rubber Track Tension
WARNING! Exposure Hazard. The rubber track
tension adjuster contains grease under high
pressure.
Use the following guidelines when adjusting track
tension.
• Do not turn the grease valve more than one full
turn out.
• Stand to the side of the adjuster when adjusting
tension.
• Check the tension of the rubber track before
adjusting. See “Checking Rubber Track Tension”
on page 5-61.
In case the tension is too low (to increase
tension)
If the rubber track tension is too low (15 mm or
more), the track could fall off during operation and
cause premature wear of the metal core. Perform
the following adjustments.
6. With two mounting bolts (2) removed, take off
the inspection cover (1).
Fig. 5-130
7. Pack the grease through grease valve (3) by
means of grease gun.
Fig. 5-131
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