Thermal Arc ULTIMA 150, Service Manual

Page: 38 / 64

SECTION 4: REPAIRS & REPLACEMENT 32 Manual 0-2503
B. Fan Replacement
1. Remove the Enclosure Cover per Section 4.04.
2. Tilt the ULTIMA-150 Plasma Welder on its side
far enough to gain access to the four Motor Mount-
ing bolts on the bottom of the unit.
3. Loosen the four bolts securing the Motor Panel
Assembly.
4. Slide the complete Motor Assembly, Fan, Pump,
and Mounting Panel towards the rear of the unit.
5. Loosen the screw securing the Fan to the Motor
Assembly shaft.
6. Note the way the Fan is installed on the Motor
Assembly shaft.
7. Carefully slide the Fan off the Motor Assembly
shaft.
8. Install the replacement Fan by reversing the above
steps noting the following:
a. Install the Fan the same as noted in Step 6.
b. The Motor Assembly shaft must be flush with
the front part of the Fan Bushing.
c. Apply Loctite to the fan screw before tighten-
ing.
(To Quick
Disconnect)
(To Reservoir)
Fan
Radiator
Motor
Assembly
A-00844
Figure 4-9 Fan and Motor Assemblies
C. Motor Replacement
1. Remove the Enclosure Cover per Section 4.04.
2. Remove the Pump Assembly per paragraph ‘A’
above.
3. On the Motor Assembly note where the Motor
wiring terminates.
4. Locate the Hose Assembly attached to the upper
radiator connection.
5. Loosen the hose clamp and remove the Hose As-
sembly.
6. Disconnect the Motor Assembly wiring from the
Contact Assembly and the ground screw.
7. Tilt the ULTIMA-150 Plasma Power Supply on its
side far enough to gain access to the four motor
mounting bolts on the bottom of the unit.
8. Remove the four bolts securing the Motor Panel
Assembly.
9. Remove the complete Motor Assembly, Fan, and
Mounting Panel from the unit.
10. Note the way the Fan is installed on the Motor
Assembly shaft.
11. Loosen the screw securing the Fan to the Motor
Assembly shaft and remove the Fan.
12. Remove the four bolts and washers that secure
the Motor Assembly to the Motor Mounting.
13. Install the replacement Motor Assembly by revers-
ing the above steps noting the following:
NOTE
Before installing the replacement Motor, check that
the internal wiring of the Motor is set for the proper
input voltage per the information on the Motor
nameplate.
a. Install the Fan the same as noted in Step 10.
b. The Motor Assembly shaft must be flush with
the front part of the Fan Bushing.
c. Apply loctite to the fan screw before tighten-
ing.
d. Proper orientation of the Pump Assembly to
the Motor Assembly per paragraph ‘A’.