Great Plains 3PYP Operator Manual - Manual (Page 94)

90 3PYP Table of Contents Index Great Plains Manufacturing, Inc.
401-312M Table of Contents Index 2014-09-09
Chain Maintenance
Inspect and lubricate chains regularly. The slack of new
chains tends to increase during the first few hours of
operation due to seating.
Chain Slack
Check slack within the first 8 hours of operation and
tighten idlers as necessary.
Refer to Figure 111, which, for clarity, greatly exaggerates
slack, and omits the idlers.
1. Measure the span for allowable slack:
Locate the longest span of each chain (usually the
span which does not run through the idlers).
2. Determine the ideal slack:
Long chains (over 36 in./91 cm):
1 ⁄
4
inch per foot (2.1 cm/m)
Vertical short chains:
1 ⁄
4
inch per foot (2.1 cm/m)
Horizontal short chains:
1 ⁄
2
in. per foot (4.2 cm/m).
3. Measure the current slack :
Acting at a right angle to the chain span at the center
of the span, deflect the chain in both directions. The
slack is the distance of the movement.
4. Adjust the idlers for ideal slack.
Whenever mounting a chain, make sure the clip at the
removable link is oriented to minimize snags.
Refer to Figure 112 (gray or striped arrows show chain
direction in chain routing diagrams)
Install clip with open end facing away from direction of
chain travel.
Meter Drive Chain
Refer to Figure 113
Remove the seed meter and check the chain and
sprocket for wear. Refer to “Seed Meter Setup and
Adjustment” on page 70, for more information.
Figure 111
Measuring Chain Slack
27264
2
1
1
Figure 112
Chain Clip Orientation
26482
2
Figure 113
Meter Drive Inspection
21917