Motor Assembly Replacement
4D3350
Reference: Use this instruction with replace-
ment part 4D3350.
Tools Needed: Phillips screwdriver, flat-
bladed screwdriver, 1/16”
Allen wrench
Warning-Hazardous Voltage
Warning-Internal components may
be damaged by static electricity.
CAUTION: Improper connections
may cause damage to the instrument.
Instruction:
1. Turn off the power and unplug the instru-
ment.
2. Remove the screws securing the instru-
ment cover, and remove the cover (see
below):
The following instructions refer to 4D3
cryoscopes with suffix "A" or later, and
to all 3D3 osmometers:
a. Remove the two sets of screws from
the side panels and the two screws
from the rear panel.
b. Slide the instrument cover up and off.
The following instructions refer to 4D3
cryoscopes without a suffix:
a. Remove the heat transfer fluid from
the front cover.
b. Remove the two screws from the rear
panel of the back cover and lift off the
back cover.
c. Remove the four screws from under-
neath the front cover, lift the front
cover slightly up and then slide it for-
ward and off.
3. Disconnect the three motor connectors
from the harness.
4. Remove the six screws from the deck (A),
and remove the deck.
Note: If you have a 4D3 cryoscope with no
suffix, there are seven screws on the
deck that you must remove.
5. Remove the deck and motor assembly and
place it on a flat surface near the instru-
ment.
6. Remove the two screws (B) that secure
the bracket to the deck.
7. Remove the two Allen (C) screws that
secure the clutch to the motor shaft. If
For additional information or technical assistance,
please contact Advanced Instruments Hot-Line
®
Service Center (U.S. 1-800-225-4034, outside
North America +US 1-781-320-9000).
4DP350 Rev0
(4D35 Service Manual)
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