Great Plains YP1625 Operator Manual - Manual (Page 89)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 85
03/12/2012 401-226M-A
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 at fixed idlers within the first 8 hours of oper-
ation and tighten idlers as necessary. Check slack at
spring-operated seasonally (normally a spring length
check).
Refer to Figure 122, 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 36in/91cm):
1 ⁄
4
in per foot
Vertical short chains: 1 ⁄
4
in per foot (2.1cm/m)
Horizontal short chains: 1 ⁄
2
in per foot (4.2cm/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.
Chain Clips
Whenever mounting a chain, make sure the clip at the
removable link is oriented to minimize snags.
Refer to Figure 123 (arrow shows chain direction)
Install clip with open end facing away from direction of
chain travel (shown by gray or striped arrows in chain
routing diagrams).
Meter Drive Chain
Refer to Figure 124
Remove the seed meter and check the chain and
sprocket for wear. See “Meter Removal” on page 63, for
more information.
FigureSpacer:
FigureSpacer
.eps
50%
Figure 122
Measuring Chain Slack
27264
2
1
1
FigureSpacer
.eps
60%
Figure 123
Chain Clip Orientation
26482
2
FigureSpacer:
Figure 124
Meter Drive Chain
21917