Troubleshooting overview

Tool starts immediately when air hose is connected.

Motor valve defective / stuck in open position.

Replace the motor valve.

Air logic unit defective.

Replace the air logic unit.

Motor runs, but spindle does not rotate.

Split gear, planetary gear, bevel gear or gear wheel in motor housing defective.

Preparation:

Remove the motor valve and motor from the head. Spin the input shaft of the gear.

If the spindle rotates and the gears runs smooth:

1) Make sure the gear wheel in motor housing is OK.

2) Remove the motor from housing and make sure outgoing gear is OK.

3) Low speed unit: If the primary gear is OK, make sure the planetary gear is OK.

4) High speed unit: Make sure the splines adapter and gear / splines are OK.

If the spindle does not rotate and the gears hacks and sheaves:

1) Remove the split gear.

2) Rotate one axle and hold against the other.

If the split gears condition are OK:

3) Remove the bevel gears from bevel gear housing.

4) Make sure the bevel gears condition are OK.

If the bevel gears are OK, the gear wheels in the head are broken.

Spindle rotates, but does not feed forward.

Air logic unit defective.

If clicking noise from the spindle:

The spindle is probably stuck in home position, if not make sure feed gear is OK.

Remove the spindle, see section Changing the spindle.

Perform a test. Service is needed if the spindle stucks again.

Test that spindle rotates.

Feed gear problem.

Make sure the declutching moment is correct, pls contact your Atlas Copco representative for instruction.

Air logic unit defective.

Replace the air logic unit.

Spindle stops or feed back before drilling cycle is completed.

Drill bit defective.

Replace the drill bit.

Too low declutching moment in overload clutch.

Make sure the declutching moment is correct, pls contact your Atlas Copco representative for instruction.

Too high drill force.

Too large drill size.

Verify rpm / feed / drill size according to specifications.

Motor stops before end position.

Air leak in valve pin in upper housing.

Replace the valve pin.

O-ring missing or defective.

Make sure all o-rings in upper housing are OK. Replace if necessary.

Motor valve defective in upper housing.

Replace the motor valve.

Spindle does not feed back when drilled finished.

Valve pin defective.

Replace the valve pin.

Valve pin blocked.

Verify that the valve pin are free and not blocked from grease and dirt.

Air logic unit defective.

Replace the air logic unit.

Rocker valve defective.

Replace the rocker valve.

Spindle does not feed back when rettract-button is activated.

Air logic unit defective.

Replace the air logic unit.

Tool does not start when start button is activated.

Too low supply pressure.

Make sure the supply pressure is correct, see section Technical data.

Emergency stop activated.

Pull the emergency stop button to reset it.

Air leak in valve pins in upper housing.

Make sure no air leaks exists.

Motor valve defective.

Replace the motor valve.

Air logic unit defective.

Replace the air logic unit.

Air leak in joints, caused of defective or missing o-rings.

Make sure the o-rings condition are OK.

Motor valve blocked.

Verify that the valve is free.

Rocker valve defective.

Replace the rocker valve.

Tool starts slowly when start button is activated.

O-ring in motor valve are not lubricated.

For instruction, see section Lubrication.

Motor starts, but stops immediately when start button is released.

Overload clutch stuck in open position.

Make sure the overload clutch functions properly.

Air leak in valve pins.

Replace the overload clutch.

Air logic unit defective.

Replace the air logic unit.

Motor does not stop in home position or runs “unnecessary long time” before stoping.

Rocker valve defective.

Replace the rocker valve.

Valve pin defective.

Replace the valve pin in upper housing.

Motor valve closing too slow.

Replace the motor valve.

Stop in valve pin.

Verify that valve pin in upper housing is free and not blocked.

Incorrect spindle speed. Reference value: +/- 10% from rated speed.

Motor defective.

Replace the motor.

Split gear reversed.

Make sure the split gears spec. are correct and that right side is up.

Wrong split gear.

Verify that correct split gear is selected.

Tool starts and feeds forward when start button is pushed down, but retract when start button is released.

Air leak in overload clutch valve pin.

Make sure that all o-rings are in good condition.

Replace the overload clutch.

Tool starts but retract when start button is released.

Air leak in overload clutch.

Replace the overload clutch.