15
Trouble shooting
Problem Cause Solution
Decreased
penetration rate
Air leakage in hoses, couplings Change packings, and where required, change parts in
the throttle valve�
Shank sleeve Check the shank sleeve for excessive wear� Replace if
necessary�
Air leakage due to worn piston/cylinder Replace the piston and/or cylinder
Air leakage due to worn guide sleeve/pilot guide Change the worn part
Insufficient feed
force
Piston rod seal (in pusher leg) worn or deformed Change the seal
O-rings on pusher leg coupling worn or deformed Change the o-rings
Poor rotation Splines of the rifle nut worn Replace the rifle nut if the splines are worn
Splines of the rifle bar worn down Replace the rifle bar when needed
Splines on the piston worn down Replace the piston when needed
The toothing in the ratchet housing is worn out Replace the ratchet housing if the tooth housing is so
worn that the pawls have difficulty catching
The toothing in the ratchet wheel is worn out Replace the ratchet wheel if the toothing is so worn that
the pawls have difficulty catching
Chuck nut worn out Replace the chuck nut if the splines have been worn to
1/2 of the spline width
Pawls worn Replace all pawls, all pawl springs and all pawl pins�
Uneven running Piston has seized in the guide sleeve or the piston guide Replace the guide sleeve/piston guide� If required,
polish the piston� Check the piston for heat damage
such as blue colouring and/or fissures� If it is damaged
in this way, replace the piston as well�
Dirty or damaged main valve� Caused by impurities or
foreign matter entering the drill with the compressed air
Clean and polish the valve so that it seals against the
corresponding cylindrical and plane sealing surfaces� If
this is not possible because the defects are too serious,
the valve must be replaced�
Freezing� Caused by leakage in the flushing system or
by excess water in the compressed air or by excessive
water pressure
Check the flushing tubes and seals and the water
pressure� Drain water from the compressed air system�
If the problem continues, fit a water separator in the
airline system�
Uneven running
(continued)
The side bolts are unevenly or insufficiently tightened�
Can cause the various parts to lose their alignment,
resulting in the seizure of the movable parts� Abnormal
strains on the side bolt may result in fracture at the
threads
Check and repair any damage to the contact points and
tighten the bolts with the correct tightening torque
The drill gets hot Lack of oil Add oil and check that it runs through� It is not sufficient
that there is oil in the exhaust air� There must also be an
oil coating on the shank of the working tool�
Freezing High level of humidity in the compressed air Use water traps
Water pressure higher than the air pressure Lower the water pressure
Water pipe
breakage
Misalignment of the shank Change working tool or shank sleeve or both
Damaged flushing hole in the shank Change working tool
Chipping of the
piston tip
Misalignment of the shank Change the working tool or shank sleeve or both
Excessive wear of the piston tip Change piston
Spline breakage
Lack of lubrication Lower the water pressure if it is the same as or greater
than the air pressure
Increase lubrication or change oil
Dirt intrusion (specially when drilling upwards) Increase service intervals
Piston breakage
Lack of lubrication Lower the water pressure if it is the same as or greater
than the air pressure
Increase lubrication or change oil
Uneven tension in the side bolts Tighten the bolts correctly
Worn guide sleeve/piston guide (can be confirmed by
the cushion test)
Change the worn part
Side bolt breakage Uneven tension on the bolts Tighten the bolts correctly
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