LeeBoy 8520C - Chain Tension Adjustments; Auger and Conveyor Chain Tension Adjustment

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LeeBoy 8520C Conveyor Paver 5-51
Maintenance
S
S
TL
45º
Horizontal to 45° Chain Tension
45° to Vertical
Chain Tension
S
S
45º
TL
S - SLACK
TL - TANGENT LENGTH
Figure 5-67. Chain Slack Adjustment for Proper
Tension
Auger and Conveyor Chain Auger and Conveyor Chain
Tension AdjustmentTension Adjustment
The auger and conveyor chains need periodic adjust-
ment. Generally, the slack of a roller chain should be
on the lower side. (Figure 5-67) Adequate slack (S) is
about four (4) percent of the span for normal drives, but
the slack should be about two (2) percent of the span for
the auger chains:
• Vertical drive or close to vertical drive.
• Center distance between two shafts is greater than
three (3) feet.
• Chain is operated under heavy load and high
frequency of on and off drive.
• Direction of the drive is often changed.
Auger and conveyor chains must have
a slack of 1/4 to 3/8 inches. To measure deection,
exert 40 - 60 pounds of force to chain in either
direction.
Tangent Length (TL) Between Sprockets in Inches (Centimeters)
10 (25) 20 (51) 30 (76) 50 (127) 70 (178) 100 (254)
Slack Length Between Sprockets in Inches (Millimeters)
Horizontal
To 45°
0.4 - 0.6
(10 - 15)
0.8 - 1.2
(20 - 30)
1.2 - 1.8
(30 - 46)
2.0 - 3.0
(51 - 76)
2.8 - 4.2
(71 - 107)
4.0 - 6.0
(102 - 152)
45° To
Vertical
0.2 - 0.3
(5 - 8)
0.4 - 0.6
(10 - 15)
0.6 - 0.9
(15 - 23)
1.0 - 1.5
(25 - 38)
1.4 - 2.1
(36 - 53)
2.0 - 3.0
(51 - 76)
REQUIRED MID-SPAN MOVEMENTREQUIRED MID-SPAN MOVEMENT