Drifter chain tension
The adjustment is carried out on the chain tighten-
All the hoses should be tightened with the excep-
er A (see Figure). Generally speaking, the chains
tion of the drifter hoses (P1 and P2) which should sag
should not be too tight (the front chain vibrates abnor-
slightly when they are not under pressure (the pres-
mally during drilling) or too loose (the front chain
sure tightens these hoses when in operation).
lashes out against the feed box or the tightener
strikes against the feed extension cylinder attach-
The guide should be put in toe hole drilling posi-
Change the chains when the tightener no lon-
tion, horizontal, to prevent cradles from sliding when
ger reaches their extension.
the chains or the reel rope are dismounted.
Hose reel chain tension
After chain (rope) replacement, move the drifter
back to its rear end position. Verify the distance be-
In the same way, the adjustment is carried out on
tween the drifter cradle and the hose reel cradle is 60
the chain tightener B (see Figure). The cable should
15 mm (2.4 .6 in) (see Figure).