4DP690 Rev3
(4D35/3255/MK05 Service Manual)
Page 2 of 7
attached to the Cooling Assembly inlet has
been changed to a different, larger check
valve (99133R) to improve instrument per-
formance and reliability.
Figure 1 shows the current 4D3690 Pump
Assembly with the various components
labeled.
CAUTION: The heat transfer fluid
contains hazardous chemicals.
Consult the material safety data sheet
(MSDS) and use appropriate personal
protective equipment.
4D3690 Heat Transfer Fluid Pump
Assembly Replacement
Models 3D3 and Mark 3 Osmometers
Models 4D3 and Mark 2 Cryoscopes
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 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.
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.
Figure 1
Cooling System Inlet
Check Valve (99133R)
Cable Clamp
Main Pump
Fluid Filter
Bottle Check Valve
Manual Primer Pump
4D3690 Pump Assembly
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