Safety and operating instructions
© Construction Tools PC AB | 9800 0908 01 | 2023-05-12
Original Instructions
21
The wear bushing must be replaced when the inner
diameter(A) has reached its maximum wear limit,
see section "Wear limits" and "Replacing the working
tool bushing".
n
Check the working tool for wear.
The working tool must be replaced when the outer di-
ameter(B) has reached its minimum wear limit. See
section "Wear limits".
Too large clearance can make the working tool break
and the piston can be damaged.
n
Check the breaker and the adapter plate for cracks
and wear.
n
Check that the accumulator screws are properly tight-
ened. The correct tightening torque is found in the
spare parts list.
NOTICE The working tool must never be sharpened by
forging. Sharpening must only be performed by milling,
grinding, or turning.
7.4.1 Wear limits
A mm (in.) B mm (in.)
SBU 160 52 (2.0) 48 (1.9)
SBU 220 68 (2.7) 63 (2.5)
SBU 340 83 (3.3) 78 (3.1)
7.4.2 Replacing the working tool bushing
The working tool bushing is kept in place by the tool re-
tainers. A new bushing has a slip fit.
1.
Remove scraper ring and bushing. If a worn out
bushing is stuck, use a sliding hammer to remove it.
2.
Carefully clean the bore and the bushing seat area.
3.
Mount new O-rings, lubricate and mount the bushing.
4.
Use a plastic sledgehammer to insert the bushing.
5.
Rotate the bushings until the tool retainers find their
position at the bushing.
6.
Mount a new scraper ring.
7.5 Every year
Overhauling must be done after one year of continuous
operation. Overhauling must for safety reasons be per-
formed by authorised personnel at an authorised work-
shop.
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