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Basic Preventative Maintenance For Class 51000 Machines
Union Special Corporation's Class 51000
machines are high throw, single-needle, multi-thread chainstitch, left
hand flatbed machines.
The Style 51000 B machine includes a top and
bottom feeding system for powerful, accurate seaming of multi-wall paper
bags made of heavy to extra heavy weight material.
This machine is also equipped to sew a filter
cord onto the bag with the special standards presser foot. Style 51000 B
machines sew at speeds up to 3800 stitches per minutes at a stitch range
of from 3 1/2 to 7 stitches per inch.
Routine maintenance of Style 51000 B, and any
machines, is important and should be performed at least every 6 months or
2000 operating hours.
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Drain the old oil from the machine. To do
this, remove the plug screw below and to the front of the hand wheel of
the machine, Figure 1. Tip the machine
carefully until all of the oil is removed.
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Remove the cloth plate and use a small brush,
rag or compressed air to carefully clean the lint, dirt and other debris
from this area, Figure 2. If lint and
dirt are not removed at regular intervals, excessive heat, binding or wear
could occur.
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Remove the oil reservoir back cover, crank
chamber cover and oil reservoir top cover. Using a clean rag, carefully
wipe away the excess oil and other contaminants that could be in the oil
reservoir chambers, Figure 3. Also
inspect the gaskets for cracks, tears or dry rot and replace as needed.
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Check for left to right shake in the
crankshaft and remove any excess shake. As a reminder, the machine should
turn smoothly without binds, but should also have no left to right shake,
Figure 4. Also check for left to right
shake in the feed rocker and upper feed mechanisms and remove any excess
shake, Figure 5.
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