Great Plains
| 411-332M | 2019-02-19
94
3P3025AH
Maintenance
Speed Sensor Gaps, Hydraulic Drive
1. Make sure a tooth on the sensor sprocket is
aligned with the sensor .
2. Check that wheel teeth are on sensor wheel
side-to-side. If adjustment is needed, loosen the top
jam nut on sensor. Adjust the position of the
sensor and tighten the top jam nut.
3. Check gap between end of sensor and tooth on
the sensor sprocket. The gap must be
1
/
16
inch (1.6 mm).
To adjust, loosen both jam nuts. Adjust the jam nuts
to set gap. Tighten jam nuts without changing the
gap.
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 chain slack within the first 8 hours of operation
and adjust as necessary. Check slack at spring-operated
idlers seasonally.
Refer to Figure 116, 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 inch/91 cm):
1
/
4
inch per foot.
Vertical short chains:
1
/
4
inch per foot (2.1 cm/m).
Horizontal short chains:
1
/
2
inch 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.
Chain Clips
Whenever mounting a chain, make sure the clip at the
removable link is oriented to minimize snags.
Refer to Figure 117 (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).
Figure 115
Hydraulic Drive Sensor Gap
(Shield removed for clarity)
68093
A
2
1
3
1
2
3
A
Figure 116
Measuring Chain Slack
27264
2
1
Figure 117
Chain Clip Orientation
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