Thermal Arc ULTIMA 150, Service Manual

Page: 39 / 64

Manual 0-2503 33 SECTION 4: REPAIRS & REPLACEMENT
D. Radiator Replacement
1. Remove the Enclosure Cover per Section 4.04.
2. Remove the Logic/Display PC Board per Section
4.05-B.
3. Remove the Front Panel.
4. Drain coolant below Return level.
5. Loosen Hose Clamps and remove Hoses from Ra-
diator.
6. Carefully remove Thermostat Switch (solid state).
7. Loosen Fan and slide towards the motor.
8. Remove (6) screws securing Radiator.
9. Slide Radiator to the left. Rotate counterclock-
wise until fittings clear bracket.
10. Slide Radiator to the right to remove.
11. Install the replacement Radiator by reversing the
above steps.
(To Quick
Disconnect)
(To Reservoir)
Fan
Radiator
Motor
Assembly
A-00844
Figure 4-10 Radiator Assembly
4.08 Coolant Filter Assembly
Replacement
The Coolant Filter Assembly is located on a bracket on
the rear panel of the unit.
1. Remove the two coolant hose connections to the
Filter Assembly.
2. Remove the two elbow fittings on each side of the
Coolant Filter Assembly and remove the damaged
Coolant Filter Assembly from the bracket.
3. Clean the old thread sealer from the threads of
the elbow fittings.
4. Apply a thin coating of liquid Teflon thread sealer
to the threads of the elbow fittings.
5. Place the replacement Coolant Filter Assembly in
the bracket with the arrow pointing to the left and
reinstall the two elbow fittings.
6. Reconnect the two coolant hoses to the Coolant
Filter Assembly making sure that the hose to the
Pump Assembly is on the output of the Coolant
Filter Assembly (left side as viewed from the
back).
Coolant Filter
Assembly
Cap
Coolant
Reservoir
(Basket &
Deionizer
Bag Inside)
Hose
A-00825
Figure 4-11 Coolant Filter Assembly