Care And Maintenance; Troubleshooting - Hilti UD16 Operating Instructions Manual

2. Grip the flat section of the drive spindle with a 17
mm AF open‐end wrench.
3. Grip the hexagonal steel with a suitable wrench.
4. Turn the 17 mm AF open‐end wrench in a coun-
terclockwise direction.
The key chuck will be unscrewed from the drive
spindle.
en
7.3.3 Fitting the keyless chuck
1. Screw the keyless chuck onto the drive spindle by
hand as far as it will go.
2. Grip the flat section of the drive spindle with a 17
mm AF open‐end wrench.
3. Grip the hexagonal section of the keyless chuck
with a 19 mm AF ring or open‐end wrench.

8. Care and maintenance

CAUTION
Ensure that the power tool is disconnected from the
electric supply.
8.1 Care of insert tools
Clean off dirt and dust deposits adhering to the insert
tools and protect them from corrosion by wiping the
insert tools from time to time with an oil‐soaked rag.
8.2 Care of the power tool
The outer casing of the power tool is made from
impact‐resistant plastic. Sections of the grip are made
from a synthetic rubber material.
Never operate the power tool when the ventilation
slots are blocked. Clean the ventilation slots carefully
using a dry brush. Do not permit foreign objects to
enter the interior of the power tool. Clean the outside
of the power tool at regular intervals with a slightly
damp cloth. Do not use a spray, steam pressure
cleaning equipment or running water for cleaning.
This may negatively affect the electrical safety of the

9. Troubleshooting

Fault
The power tool doesn't start.
28
4. Tighten the chuck to the specified torque (see
technical data).
7.3.4 Fitting the key chuck
1. Insert a short length of hexagonal steel in the
chuck and then tighten the chuck jaws until the
hexagonal steel is held securely (use the chuck
key).
2. Screw the key chuck onto the drive spindle by
hand as far as it will go.
3. Grip the flat section of the drive spindle with a 17
mm AF open‐end wrench.
4. Grip the hexagonal steel with a suitable wrench.
5. Tighten the chuck to the specified torque (see
technical data).
power tool. Always keep the grip surfaces of the
power tool free from oil and grease. Do not use
cleaning agents which contain silicone.
8.3 Maintenance
WARNING
Repairs to the electrical section of the power tool
may be carried out only by trained electrical spe-
cialists.
Check all external parts of the power tool for damage
at regular intervals and check that all controls operate
faultlessly. Do not operate the power tool if parts
are damaged or when the controls do not function
faultlessly. If necessary, the power tool should be
repaired by Hilti Service.
8.4 Checking the power tool after care and
maintenance
After carrying out care and maintenance work on
the power tool, check that all protective and safety
devices are fitted and that they function faultlessly.
Possible cause
Interruption in the electric supply.
Remedy
Plug in another electric appliance
and check whether it works.