Hitachi ZAXIS 135US-5B Operator's Manual page 365

Other Precautions
1. Since rubber is susceptible to corrosion, do not use
grease, oil and other oily materials when inserting the
lock pin.
2. In mounting welding-type nose and the adapter onto
the bucket, lock pin (3) should be removed from the
nose when preheating and welding. Otherwise the
rubber will be spoiled.
MAINTENANCE
7-91