TM 5-3805-280-10
E
Adjustment of drilling automatisms
XCEPTIONAL ADJUSTMENTS
Reverse percussion pressure
Maximum percussion pressure
Note : The full drifter reverse percussion pressure
is only obtained when drilling in manual" position.
The factory set pressure (130 bar - 1860 psi) can
2
be modified by setting the stop screw A :
- Tighten to reduce the pressure.
- Loosen to increase.
V2
Check the pressure on P2" gauge.
Do not exceed 130 bar (1860 psi)
A
For checking or setting after part replacement,
1) Disconnect and plug the drifter percussion
hose.
2) Remove the protection cap and loosen MP
maximum percussion pressure relief valve (2).
30) Set the maximum percussion pressure to
190 bar (2720 psi) by tightening the relief valve (2).
Check the pressure on P2" gauge.
t
31) Secure the safety nut, remount the protec
ion cap.
19-7
