4-47
4.14.3
ADJUSTING CRAWLER TENSION
• Before inspecting and greasing the crawler, remove soil adhered to the crawler tracks completely by washing
them.
• Crawler adjustment is necessary depending on the work condition at the working site. At a working site covered
with many gravel and cobbles, loosen the crawler tension slightly, and on a firm ground, increase the tension
slightly.
CHECKING CRAWLER TENSION
A
•
Measure the upper part of the shoe and the lower
part of the track frame, while raising one of the
crawlers up, for which tension is to be measured.
In this case, hold the raised machine with a stand
securely.
A proper tension: 270 to 300 mm (10.6 to 11.8 inch)
CRAWLER TENSION ADJUSTMENT PROCEDURES
ABOUT CRAWLER FAILURE
When a crawler cannot be adjusted, the crawler has a failure.
A strong force is applied to the spring of track spring. Grease in the cylinder is under high pressure. If the travel
system is adjusted or disassembled in a wrong way, it is very dangerous and could cause severe personal injury.
1
1.
Crawler tension is adjusted by applying grease to
grease nipple (1) of the idler adjuster of lower frame
with a grease gun.
2.
In order to make the both tension of the left and right
crawlers equal each other, travel the machine
forward and backward to even out the pressure.
3.
Check the amount of slack of the crawlers once
again and readjust them as necessary.
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