MAINTENANCE
BG 25 / 2011 /
2254_BG25_en_0000498763_V01
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9.10.6.2 Checking Driver Strips for Wear
Every 50 operating hours or weekly:
Check Kelly driver strips (5) for wear.
If the wear (x) is in excess of 8 mm, turn the strip around by 180° and reinstall it, or
replace it right away with a new one.
Replace also bushings (4) and bolts (3) if they are worn down.
NOTE
When fitting a new driver strip, the play (y) should not exceed 0.5 mm.
Bolt torque value
M
a
[Nm]
Kelly driver strips mounting
Hex socket head bolts
see Spare Parts List
Hex socket head bolts with nuts
see Spare Parts List
x
y
A
A
B
B
1
2
3
4
5
6
B - B:
A - A:
B0000580.wmf
