Hilti DD-750 HY Mode D'emploi page 28

Hydraulic units – operation
➊ Three-phase 400 V mains supply (380 V,
415 V) with appropriate fuse rating: The
switch electronics set the correct direction of
rotat ion automatically. Standard Euro plug as
per CEE 32.
➋ The units employ star / delta type switching
(Y-∆). Starting up takes only a few seconds
(max. 5 sec.)
➌ Use an extension cable of adequate cross-
sectional area. The unit will not start if the
voltage supplied is too low or if one of the
phases is too weak.
➍ The water supply is always connected to the
lower coupling on the hydraulic unit. Water
pressure should be 4–6 bar, with a flow rate
of 10 l/min. (at least 5 I/min.).
➎ LP 15 oil level: dipstick
LP 32 oil level: sight glass
➏ Keep the hydraulic couplings clean. When
connecting the hoses, turn the securing ring
after the coupling engages with an audible
"click".
➐ Safety-type plugs are fitted. Switch on the unit
only after everything has been connected.
➑ Switch on at the D-RC-LP32 remote control
unit. Do not exceed 60 I/min. when operating
the DD-750 HY!
➒ Disconnect the water supply hose ➍ after
finishing work. The hydraulic unit (oil cooler)
then drains automatically.
Instructions for maintenance of the hydraulic units
● Check the oil level at weekly intervals and, if necessary, top up with hydraulic oil, type HLP 46
(Hilti item no. 221201).
● The oil should be changed for the first time six months after the unit is put into service. There-
after, change the oil at yearly intervals and apply the Hilti maintenance sticker. The D-LP 15 has
an oil capacity of 20 litres and the D-LP 32 contains 35 litres.
● If power output drops when using the hydraulic unit or if the unit fails completely, it can be
checked on the spot by a Hilti specialist.
● If the D-LP 15 makes an unusual noise when running, it may be that the oil level is too low or
the unit has not reached operating temperature (too cold). If the D-LP 32 does not start or sud-
denly stops, check the oil level (top up) and check that it has not overheated as a result of in-
adequate cooling.
● When operated in winter or at low temperatures, the hydraulic unit should be allowed to run
for a few minutes until warm (with water running) before a load is applied.
● Do not run the hydraulic unit without cooling water. Always keep the water running when op-
erating at temperatures below zero! Disconnect the water supply hose from the unit when work
is finished: The unit then drains automatically. Use only couplings of the free-flow type
(without automatic valve) for the water supply to the hydraulic unit!
● Note: If the voltage of one of the three phases is too low, the hydraulic unit will NOT start! Always
check the mains supply first!
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Printed: 22.10.2015 | Doc-Nr: PUB / 5069605 / 000 / 03
Technical data:
Nominal power output:
Supply voltage: 400 V /~50 Hz,
Fuse rating, min.:
Fuse rating, max.:
Max. operating press.:
Oil flow rate: max45 l/min
Weight: ca. 113 kg
Remote control: hydraulic
Remote control: electric on/off
Protection class:
D-LP15 D-LP32
15 kW 32 kW
400 V /~50 Hz,
3P+PE 3P+N+PE or 3P+PE
16 A
32 A
180 bar 210 bar
30-100 l/min
ca. 210 kg
electric 10 m
with extension 20 m
IP44
32 A
63 A
IP44