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8.3.2
Checking piston and stopper
WARNING
Risk of injury! A faulty buffer or piston or a faulty base plate leads to an increased risk of malfunctions.
▶ Check the piston and buffer for wear and replace them if damaged.
▶ Do not tamper with or modify the piston.
▶ Do not attempt to repair a faulty piston yourself, for example by grinding the tip.
1. The piston must be replaced in the following cases:
▶ The piston is broken.
▶ The piston is badly worn or chipped (e.g. a segment of the circumferential ring-shaped elevation at
the piston tip broken away).
▶ The piston rings are cracked or missing.
▶ The piston is bent (check by rolling the piston on a smooth, flat surface).
2. The stopper must be replaced in the following cases:
▶ The metal ring of the stopper is broken or detached.
▶ The stopper no longer holds on the fastener guide.
▶ The rubber is badly worn at certain points under the metal ring.
Observe the wear criteria applicable to important tool components, as listed in the "Care and
maintenance" section. → page 11
8.3.3
Criteria for replacement of wear parts
Piston and piston stopper wear criteria
Status
New condition
Worn
Always replace the pis-
ton and piston stopper
together.
*282472*
Illustration showing example
282472
Annotation
Signs of chipping at the tip / face
of the piston.
The piston has made a deep im-
pression (3 mm or more) in the
piston stopper.
English
11
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