Dd-Hd 30: Adjusting The Play Between Rail And Carriage; Replacing The Carbon Brushes - Hilti DD 250 Manual De Usuario

7.1.1 DD-HD 30: Adjusting the play between rail and carriage

Note
You can adjust the play between rail and carriage using the four adjusting screws on the carriage.
1. Loosen the adjusting screws using a 5 mm hexagon socket wrench (do not remove the screws).
2. Using a 19 mm open-end wrench, turn the adjusting screws so that the rollers are pressed slightly against
the rail.
3. Tighten the adjusting screws firmly. The carriage is correctly adjusted when it remains in position without
a diamond core drilling machine fitted and moves down when a drilling machine is mounted.
7.1.2 DD 200 for the DD-ST 200: Adjusting play between rail and carriage
Note
You can adjust the play between rail and carriage using the 6 adjusting screws on the carriage.
1. Use a hexagon socket wrench to tighten the adjusting screws hand-tight.
Technical data
Tightening torque
2. Then loosen the four adjusting screws at the side by turning them half of a turn and the two rear adjusting
screws by turning them quarter of a turn.
3. The carriage is correctly adjusted when it remains in position without a diamond core bit but moves down
when a diamond core bit is fitted.

7.2 Replacing the carbon brushes

DANGER
Risk of injury! Risk of electric shock.
▶ The machine may be operated, serviced and repaired only by trained, authorized personnel. This
personnel must be specially informed of any possible hazards.
Note
The indicator with the open-end wrench symbol lights up when the carbon brushes need to be changed.
Always change all the carbon brushes at the same time.
1. Disconnect the diamond core drilling machine from the power supply.
2. Open the carbon brush covers on the left-hand and right-hand side of the motor.
3. Take note of how the carbon brushes are fitted and how the conductors are positioned. Remove
the worn carbon brushes from the diamond core drilling machine.
4. Fit the new carbon brushes so that they are positioned exactly the same as the old ones fitted previously.
Note
Take care to avoid damaging the insulation on the indicator lead as you insert the brushes.
5. Screw on the carbon brush covers on the left- and right-hand side of the motor.
6. Run in the carbon brushes by letting the machine run under no load for at least one minute without
interruption.
Note
After replacing the carbon brushes, the indicator lamp will go out after the machine has run for
approx. one minute.
If the minimum running-in time of one minute is not observed, the life of the carbon brushes will be
greatly reduced.
22
3 Nm