Thermal Arc ULTIMA 150, Service Manual, Page: 41 / 64

Manual 0-2503 35 SECTION 4: REPAIRS & REPLACEMENT
D. Coolant Supply Hose (Pump to TORCH
Connector) Assembly Replacement
The Coolant Supply Hose Assembly goes from the Pres-
sure Gauge on the Pump Assembly to rear panel TORCH
Connector. Replace the Hose Assembly using the follow-
ing procedure:
1. Remove the Enclosure Cover per Section 4.04.
2. Remove the end of the Hose Assembly from the Pump.
3. Disconnect the Hose Assembly from the rear panel
TORCH Connector.
4. Remove the Hose Assembly from the unit.
5. Install the replacement Hose Assembly by reversing
the above steps.
E. Coolant Return Hose (Radiator to In-Line
Filter) Assembly Replacement
The Coolant Return Hose Assembly goes from the bot-
tom outlet on the Radiator to the inlet side of the In-Line
Filter Assembly inside unit. Replace the Hose Assembly
using the following procedure:
1. Remove the Enclosure Cover per Section 4.04.
2. Disconnect the other end of the Hose Assembly from
the inlet side of the In-Line Filter Assembly.
3. Locate the end of the Hose Assembly at the lower part
of the radiator.
4. With a screwdriver loosen the Hose Clamp around
the Hose Assembly.
5. Pull the Hose Assembly from the Radiator and out of
the unit.
6. Install the replacement Hose Assembly by reversing
the above steps.
4.10 Internal Parts Replacement
This subsection describes the replacement of various in-
ternal parts. Refer to Section 5, Parts Lists for the part
number and location of each part.
A. Contactor Assembly Replacement
1. Remove the Enclosure Cover per Section 4.04.
2. Label all the wiring connected to the Contactor
Assembly.
3. Disconnect the wires from the Contactor Assem-
bly (push on terminals).
4. Remove the two nut/washers securing the Con-
tactor Assembly to the base.
5. Install the replacement Contactor Assembly by re-
versing the above steps.
B. Fuse Replacement
1. Remove the Enclosure Cover per Section 4.04.
2. Locate the Fuse on the side of the chassis above
the Front Panel Breaker Assembly.
3. Remove the Fuse.
4. Reinstall the replacement Fuse by reversing the
above steps.
Fuse
A-00841
Figure 4-12 Fuse Location
C. Transformer Assembly Replacement
1. Remove the Enclosure Cover per Section 4.04.
2. Disconnect "Filter to Pump" hose from outlet of
Filter.
3. Remove rear panel hardware.
4. Rotate rear panel to the right.
5. Locate and disconnect all Transformer wires.
6. Remove the four nuts/washers securing the
Transformer Assembly to the base.
7. Remove Transformer Assembly.
8. Install the replacement Transformer Assembly by
reversing the above steps.