Tweco Ultima 150 - Manual (Page 34)

SECTION 5: GENERAL MAINTENANCE 28 Manual 0-2472
5.04 Basic Parts Replacement
The parts replacement procedures described in this
manual are for basic replacement of parts that require lim-
ited or no disassembly of the unit. This section describes
parts replacement for the following:
1. Fuse Replacement
2. Coolant Filter Assembly Replacement
3. In-line Filter Replacement
4. Hose Assembly Replacement
Before disassembling any part of the ULTIMA-150 Plasma
Welding Power Supply, first read the procedure for the
part to be replaced, then proceed with the disassembly.
WARNING
Disconnect primary power from the source before
disassembling or replacing parts on the ULTIMA-
150 Plasma Welding Power Supply.
A. Opening the ULTIMA-150 Power Supply
1. Remove the four Phillips head screws on the top of
the Enclosure Cover.
2. Loosen the six Phillips head screws, three on each
side, at the bottom edge of the Enclosure Cover.
3. Carefully pull the Enclosure Cover up from the
rest of the unit.
B. Fuse Replacement
1. Remove the Enclosure Cover per Section 5.04.
2. Locate the Fuse on the side of the chassis above the
Front Panel Breaker Assembly.
3. Remove the Fuse.
4. Install replacement Fuse by reversing the above
AC Input Cable
Ground
Fuse
Voltage
Selection
Plug
Primary
Power Switch
A-00813
Figure 5-6 Fuse Location
C. 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 fitting 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.