4DP690 Rev3
(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:
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.
7. Replace the old assembly with the new
one.
a. Proceed with the installation of the
new pump assembly by reversing steps
1-4, making sure to use the cable
clamp already installed on the new
pump assembly. Note the orientation
of the cable clamp (see Figure 4).
Figure 4
Orient check
valve with arrow,
as shown
Figure 5
F
G
H
E
To Next Page
Loading...
Need help?
General
