Specifications

6. Check that the cross roller bearing is centered in the 2 v-rails by the following
method:
a) Center the retainer plate assembly on the embroidery head v-rail.
b) Carefully insert a solid instrument, such as a straight hex wrench, into the
opening at one end where the two v-rails join. Insert the instrument until
it contacts the cross roller bearing. Do not force it any further.
c) Mark the position of the instrument at the end of the embroidery head
v-rail, when the instrument is inserted to where it contacts the cross roller
bearing.
d) Repeat this on the other side of the v-rails and compare the two marks.
They should be very close to the same - within about 3/32 of an inch.
e) Repeat the above procedure for centering the cross roller bearing until the
checking verifies it is within the proper tolerance.
7. Push the retainer plate assembly left and right as far as possible without the
bearings coming off the end of the embroidery head v-rail. While moving the
retainer plate assembly try to hold the bearings from rotating (one at a time)
with your fingers. With a medium amount of pressure, you should be able to
stop the bearing rotation.
Both bearings should require the same amount of pressure to prevent rotation or
the cross roller bearing will migrate out of position.
8. If the test in step 7 shows an incorrect adjustment, refer to the next section,
Retainer Plate Bearing Adjustment, to make the proper adjustment.
Retainer Plate Bearing Adjustment
Note: This procedure requires the use of a special service tool: the V-Rail Adjustment
fixture (p/n 995675-01). To adjust without the fixture, refer to the
Alternate Method at the end of this procedure.
1. Loosen the two socket head cap screws holding the needle case v-rail to the
retainer plate assembly as indicated in the figure below.
2. Install the retainer plate assembly with the cross roller bearing centered between
the 2 v-rails (see Cross Roller Bearing Centering on the previous page.
3. Install the v-rail adjustment fixture (p/n 995675-01) into the middle front hole of
the retainer plate assembly as shown in Figure 2-20.
4. Snug the needle case v-rail to the retainer plate assembly very lightly with the
socket head cap screws. Do not overtighten the screws or the fixture will be
unable to perform its adjustment properly.
2 - 22 Head Section
EMC 10/4 Technical Manual Melco Embroidery Systems