Safety and operating instructions
© Construction Tools PC AB | 98001365 01 | 2020-09-24
Original Instructions
25
8 Troubleshooting
Problem
Cause
Solution
Rock drill does not work. Pressure is
not built up when throttle lever is acti-
vated.
No or incorrect flow or pressure.
Contact an authorised Epiroc work-
shop.
P and T hoses interchanged.
Check connection. Standard connec-
tion has oil flowing from male quick-
release coupling (the tail-hose of the
breaker P connection is fitted with fe-
male coupling).
Insufficient activation of throttle lever.
Adjust throttle lever (if adjustable) or
replace defective parts.
Main spool jammed or damaged.
Remove and check.
Striker piston seized.
Remove and check for 'pick-up' on
piston feeder or barrel. Replace any
damaged parts.
The drill steel is not fully home in the
nose of the rock drill.
Push the drill steel fully home in the
nose of the rock drill and lock the tool
retainer.
The twist handle on the rock drill was
not in neutral position when the
power pack was started.
Put the twist handle in off position
and re-start the power pack.
Rock drill lacks drilling power.
Insufficient available pressure.
Check main relief valve.
Low accumulator gas pressure (nor-
mally associated with violent shaking
of hoses).
Re-charge the accumulator.
Rock drill runs weakly or irregularly.
Insufficient flow.
Check flow and pressure.
Cold oil.
Warm up the oil supply. Optimum
temperature 20–40° C (68 - 104° F).
Incorrect oil.
Use only hydraulic oil according to
specification.
Back pressure too high.
Make direct tank connection. Maxi-
mum back pressure 10-15 bar
(150-200 psi) measured at rock drill.
Quick-release coupling in return line
defective.
Locate and replace defective cou-
pling.
Feed force too low when incoming
water pressure is below 5 bar (72.5
psi).
Add water boosting pump to get wa-
ter pressure up to 5-7 bar (72.5-101.5
psi).
Rock drill runs hot.
Inadequate cooling of hydraulic oil.
Check that the oil supply has ade-
quate cooling. Temperature must not
exceed 60° C (140° F).
Rock drill leaks water through the wa-
ter outlet located at the back of rock
drill.
The sealing rings in the flush housing
are worn out and need to be re-
placed.
Stop the rock drill as soon as possi-
ble and contact an authorised Epiroc
workshop.
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