18
Trouble shooting
Fault Cause Remedy
Impact mechanism does
not operate, or works
with reduced effect.
Air supply throttled or blocked.
Check the air pressure. Check that all air passages leading to
the hammer are open.
Oil is not reaching the impact mechanism of
the hammer. Poor or no lubrication, causing
increased wear, scoring or seizure.
Let operating air blow through rotation spindle on dry plank
or similar. After a few moments, plank surface should become
oily. Inspect lubricator. Top-up with oil if necessary or increase
lube oil dosage.
Too large clearance (wear) between the
piston and casing, or between piston and
control tube.
Disassemble the hammer and inspect the wear (see ”Wear
limits”). Replace worn parts.
Hammer clogged with dirt. Disassemble the hammer and wash all components.
Worn buffer rings in the cover. Disassemble the hammer and replace the buffer rings.
O-ring in bit bushing worn or damaged. Disassemble the hammer and replace the o-ring.
Lost drill bit and chuck.
Dirt enters the hammer when drilling in
water-bearing formation.
Make sure the check valve seals against the seat in the back-
head (see ”Dirt in hammer”, page 9). Remove the backhead and
replace check valve.
Impact mechanism has been operated with-
out rotation to the right.
Fish out the lost equipment using a fishing tool. Remember to
always use right-hand rotation, both when drilling and when
lifting the drill string.
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