# Changing the speed

1. Remove the motor valve, the vane motor and the range gear.

2. If applicable, change the split gear ratio as follows:

   1. Remove the split gear.

   2. Shift the shaft (1) of the split gear to set the required ratio. See the figure below. A click indicates that the shaft has shifted as desired. Secure that the shaft is in the right position with the fork-shaped tool (4141 1114 00), see the section “speed”.

   3. Line up the split gear holes over the bolts, making sure that the shaft head faces the drill head.

   4. Carefully slide the split gear into position. Turn the spline shaft (2) until the shaft (1) fits in place.

   5. Holding the pinion (3) in place with the fork-shaped tool (4080 1114 00), turn the spline shaft (2) and gently push the split gear forward until the shaft (1) fits on the pinion.

   6. Gently push the split gear forward until it clicks in place.

3. If applicable, install a new range gear. Otherwise, restore the old one to its original position. Turn the planetary gear to align the splines.

4. Restore the vane motor and the motor valve to their original position. Turn the rotor counterclockwise with the fork-shaped tool (4080 1114 00) to align the splines.

5. Before operating the drill, do a functional test of the emergency stop button:

   1. Push the start button.

   2. Push the emergency stop so that it locks in position. The spindle must stop immediately.

   3. Pull the emergency stop button to reset it. The motor must not restart.

   4. Disconnect the air hose.

   5. Reconnect the air hose.