Drive Chain Tensioning - Uniforest 85MR Instructions For Use Manual

4. Drive chain tensioning

After a certain period of operation (10 hours), the drive chain stretches; therefore it must
be checked frequently and tensioned, if required. It must be checked every 100 hours of
operation. Tensioning is done according to the following procedure (figure 12)! First,
disengage the PTO shaft and turn off the engine. Remove the protective sheet of the PTO
shaft (pos. 1).
First loosen the nust (pos. 2 and pos. 8, figure 12) with which the lower and upper drive are
fixed. Then start tigthening the longer chain with a screw (pos. 5). Turn the screw clockwise
until you reach the proper tension of the chain. The chain is correctly tensioned when it
can still oscillate for 3 to 4 mm in the transverse direction. Tighten the lock nut (pos. 12).
Now tighten the three nuts on the lower drive (pos. 2). Then start tensioning the shorter
chain (pos. 7, figure 12). If you have already loosened the four nuts (pos. 8), begin with the
turning of the tensioning screw (pos. 10) to the left. This increases the distance between
both frames. Beforehand, loosen the lock nut (pos. 11) and re-tigthen it when the chains
are tensioned.
Figure 12
13