Unic URW295CR, Руководство по обслуживанию

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１６ HOW TO PUNCH
(1) Purpose
Troubles injuring the inside surface of cylinder tube due to screws mounting piston being loosened have been
happened.
Therefore, we not only upgraded the screw lock agent “LOCK TIGHT #262” to “#2701” to strengthen adhesion but
also added punching process (partly carried out for derrick cylinder). The section defines how to punch.
(2) Punching procedures
1. Use a punch whose tip is hard and sharp enough. Closeup
2. Hit the punch head hard enough with a hammer with the punch put at a distance of 1 1.5mm from the screw end.
3. Hit the punch head so hard that the diameter of punch mark will be more than 1.5mm
4. Punch 2 places around the screw thread in diagonal position.
Fig.1 Piston
Points to remember
1. Take care not to break the target piston while punching.
2. Make the clear punch mark as illustrated in Fig. 1.
3. Punch within 5 minutes after “LOCK TIGHT” has been applied.
(Try not to give shock to the area where “LOCK TIGHT” has been applied as it starts curing.)
punch specified places close
to screw threads.
Hexagon socket head screw
Tighten each hexagon socket
screw with "Lock Tight #2701
applied to the threads to
（１６－１）