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CAUTION
Disconnect the mains plug from the power outlet.
CAUTION
Keep the machine, especially its grip surfaces, clean and free from oil and grease. Do not use clea-
ning agents which contain silicone.
1. Dissasembly of the DD-750 HY
a) Remove the core bit, remove the core from the bit and secure the items to prevent falling.
b) Disassemble the machine following the assembly instructions in the reverse order.
c) Where necessary, secure the opening you have made (cordon off).
d) Clean the DD-750 HY diamond coring machine by hosing it down and then wiping it dry with
a cloth.
If a high-pressure cleaning system is used, keep the nozzle at least 30 cm away from the machi-
ne and don't point the jet directly at seals, bearings or other sensitive parts.
2. Maintenance of the hydraulic unit – see D-LP 15 or D-LP 32 operating instructions
3. Maintenance of the DD-750 HY motor unit
● The motor unit requires no maintenance.
● Coupling interfaces should always be kept clean and protected from impact damage.
● Keep the chuck and quick-release mounting interfaces clean. Lubricate with Hilti oil spray.
4. Maintenance of the other modules
● DD-CA-L carriage: The rollers require no maintenance. Check at regular intervals that the car-
riage runs on the rails without play. Readjust the rollers as necessary. Keep the quick-release
mounting interfaces clean.
● D-R . . L rails: Keep the rails clean. Pay special attention to internal tapers.
● The baseplates require no maintenance. Keep the tapers clean.
● Use water to clean the hydraulic hoses. Keep the couplings clean.
5. Releasing jammed core bits
If the core bit jams, the machine must be switched off immediately. The core bit can then be re-
leased as follows:
1. Disconnect the equipment from the electric supply.
2. Grip the core bit close to the connection end with a suitable open-end wrench and release it
by turning with the wrench while rotating the spider wheel.
3. Reconnect the equipment to the electric supply.
4. Continue drilling.
If the core bit cannot be released by following these instructions, a special extractor tool must be
used.
6. Transport and storage
NOTE
● Transport the drive unit, rig and core bit as separate units.
● Use the wheel assembly (accessory) as a transport aid.
● Open the water regulating valve before storing the machine. Especially at temperatures below
freezing point, check to ensure that all water is drained from the machine.
Printed: 22.10.2015 | Doc-Nr: PUB / 5128296 / 000 / 02
Disassembly and maintenance
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