OPERATION & MAINTENANCE MANUAL SWDE120B-3
7.7 CRAWLER
Attention：
Two persons are required when checking the tension of crawler safely. One operates
the machine to lift up one side of the crawler, and the other measures the size. Take
strict precautions against moving or action of machine. Before the above steps, warm
up the engine and park the machine on flat road firstly. If necessary, use supporting
block.
Don’t decrease the pressure suddenly because the pressure of crawler adjusting
cylinder is quite high. Don’t loose the lubrication cylinder valve with whole circle one
time but loose it to release pressure slowly. At the same time, keep your body away
from the valve.
The crawler roller pins and bushes would be wore and torn during operating which would
result in decreasing of the crawler tension. Thus, please do regular check on the tension. If
necessary, adjust the crawler.
1. Use stabilizer cylinder to lift up the machine until the crawler leaves off the ground
completely.
2. Measure the distance between the low side frame edge of the chassis and up edge of the
lowest crawler plate. The recommended distance is 15-25mm.
Attention：
Please clean the chassis before carrying out measurement when there are plenty of mud,
dust or other sundries on the chassis assembly. Otherwise, the measurement would not
be exact.
3. The tension of crawler is adjusted by using the connector installed on the outside center
between left and right crawler frame. Connect the grease gun mouth and tension cylinder oil
filling mouth through the hatch. After filling in grease, the length of the cylinder would be
increased and the pressure of the crawler spring cylinder of propel guide roller would be
increased accordingly. Keep on filling in grease until the tension is enough.
4. If there is not enough clearance between the crawler belt, it is due to the excessive
tightness. Open the oil filling mouth to discharge some of grease and back up the tension
roller.
Attention：
During loosing crawler belt, keep your head away from the grease filling mouth.
5. Check the crawler regularly.
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