5
output single width roller chain drives should be tight enough to prevent backlash but not exces-
sively tight to cause bending of the reducer shafts. Special care should be taken when adjusting the
first reduction chain. Rotate the drum (with the chain loose), to the point where the chain is at its
tightest (its high spot). Adjust the chain idler to about 1/2 inch deflection in the chain. Next, rotate
the drum a full turn to insure that the chain doesn’t get tighter than the 1/2 in. deflection. A 1st re-
duction chain that’s too tight will permanently bend the input shaft.
The triple width cross chain should be sufficiently tight to prevent tipping of the guide link. Any un-
steady movement of the carriage could indicate a loose cross chain or lack of lubrication on the
guide bars.
The cross chain should be adjusted an equal amount at both ends by the corresponding adjusting
screw. The distance from the back of the chain to the inside of the drum must be equally spaced.
See Figure 3.
The front chain drive (2nd reduction) from the speed reducer must be loosened before
any adjustment is made to the cross chain.
Rotate the drum one revolution taking a measurement at four locations to check for equal spacing.
Checking in four locations will compensate for any distortion in the drum flanges. Shift the cross
chain assembly by turning the adjusting screws at each end after the lock nuts have been loosened.
If the rope piles up at one end and leaves an opening at the other end, shift the cross chain slightly
away from the end where the rope piles up
The cross chain length is for an average drum width. If the rope piles up at both ends of the drum,
the cross travel speed is too slow, or the cross chain length is too long. Remove one pitch from the
cross chain and check for rope pileup at the ends of the drum. Make further adjustments to the cross
chain length by removing additional links if necessary.
If the rope leaves an opening at both ends of the drum, the cross chain length is too short. Add one
pitch to the cross chain and check for openings at the ends of the drum. Add additional links if nec-
essary.
6. Lubrication
Every 3 months or seventy five (75) hours of operation, the level wind assembly should be lubricat-
ed in accordance with the instructions shown on figure 4.
Use standard motor oil in four oil cups marked “C”, three roller chains (lubricated on the inside sur-
Figure 3.
1st Reduction Chain
2nd Reduction Chain
Maintain equal distance on
both sides of cross chain
Adjusting Screws
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