Komatsu PC210LC-6K Operation & Maintenance Manual page 254

29. INTRODUCTIONS OF ATTACHMENTS
29.6 USING THE EXTENSION ARM
When the extension arm is installed, be careful when retracting the
arm because the bucket hits the foot of the boom cylinder or the lower
frame of the swing circle. be careful at operation and transportation.
(a): Prohibited zone to be operated
• When the extension arm is equipped, use the narrow bucket (bucket
width: 750 mm (30 in.) and 560 mm (22 in.) without the side-cutter.
Since the standard bucket causes body instability and the bucket
interferes with the operator's cab when retracting the arm do not
mount the standard bucket.
• Work in hard soil or rocky terrain will shorten the life of the extension
arm, the boom and the arm.
It is better not to use the extension arm in such conditions.
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