# Troubleshooting overview

Problems can be related to malfunctioning of valves and clutches, see the figure below.

Pos | Module
--- | ---
1 | Starting position valve
2 | Overload protection valve
3 | Depth valve
4 | Overload clutch

The table below describes the most common problems, possible reasons and actions to troubleshoot them.

Problems | Possible reasons | Actions
--- | --- | ---
The motor stops after the release of the start button. The rapid advance* button functions properly. | Starting position valve leaks. | 1. Remove the starting position valve. 2. Do a leak test of the valve, see the section “Leak test”. 3. If the results of the test are unsatisfactory, replace the valve. Otherwise, contact Atlas Copco service center.
The spindle retracts before the drilling cycle is completed. The rapid advance* button functions properly. | Depth valve leaks. | 1. Remove the drilling depth valve. 2. Do a leak test of the valve, see the section “Leak test”. 3. If the results of the test are unsatisfactory, replace the valve and complete the procedure. If the test shows no fault, continue the procedure.
| Overload protection valve leaks. | 4. Remove the overload protection valve. 5. Do a leak test of the valve, see the section “Leak test”. 6. If the results of the test are unsatisfactory, replace the valve and complete the procedure. If the test shows no fault, continue the procedure.
| Overload protection activates due to excessive feed force. | 7. Test the drill without load. 8. If the drill functions correctly when unloaded, optimize the load by reducing the feed rate or changing the drill bit. Then complete the procedure. If the test without load shows no improvement, continue the procedure.
| Overload clutch is stuck in the open position. | 9. Remove the feed cassette. 10. Remove the overload clutch. If the clutch makes a loud click, it has been released. Install the clutch in the original position and test the drill. If the drill performance improves, complete the procedure. 11. Do a test of the clutch according to the section “Test of overload clutch”. 12. If the results of the test are unsatisfactory, replace the clutch and complete the procedure. If the test shows no fault, continue the procedure. 13. Install the clutch in the original position. 14. Install the feed cassette in the original position. Complete the procedure.

* Optional feature.