KEENAN
MechFiber350 and 370 Operator’s Manual
25
Revision D01 21
st
May 2019
8.2 Chain tensioning
1. Setting tension on primary chain
Tension is set on the primary chain to remove excess slack and to prevent sagging or whipping
when under heavy loads. The secondary drive chain is adjusted automatically.
The primary chain tension is adjusted by turning the adjuster nut on the gearbox retaining bolt
(
A
)
— see Figure 11. The final adjustment is applied by adjusting the tensioner spring on the
chain links attached to the body.
70 mm
(3 inches) deflection from a straight line (
B
) is advised.
Do not overtighten, as doing so will damage the bearings. The primary drive chain spring is
nominally stretched to
270
–
290 mm
coil length and the secondary drive chain spring is
nominally stretched to
600
–
700 mm
coil length. If the springs overstretch, they will need to be
replaced.
Figure 11: MechFiber 350 and 370 chain tensioning (showing springs fully stretched)
