4DP690 Rev2
(4D35/3255/MK05 Service Manual)
Page 4 of 7
4D3690 Heat Transfer Fluid Pump
Assembly Replacement
Model 3250 Osmometers
Model 4250 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:
a. Remove the two screws from the
front of the cover and the four screws
from the rear panel.
b. Lift and tilt the cover so that the rec-
tangular opening clears the front of
the head cover first, then move the
instrument cover back, up and off.
3. Drain the system:
a. Remove the heat transfer fluid bottle
and empty the contents.
b. Replace the empty bottle and insert
the tubes.
c. Press and release gently on the pump
(E) at the rear of the cooling assembly
(see Figure 5). Continue until all liq-
uid has been expelled.
4. Remove the screw holding the cable
clamp (F) to the cooling system shroud
(see Figure 5). Firmly gripping the cool-
ing system inlet tube (G), remove the
check valve, disconnecting the pump
from the cooling assembly.
5. Remove the pump (E) from the bracket
(H).
6. Feed the fluid filter end of the pump
assembly up and around the cooling sys-
tem support brackets, and remove the
pump assembly.
Figure 4
Orient check
valve with arrow,
as shown
Figure 5
F
G
H
E
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