16.5. The most usual repairs
16.5.1. Repairs of seed coulters
The point of the coulter and the coulter tube are removed by unscrewing the nut in the point, by
pulling the nut out of the hole and by pulling the point downward.
If your machine has or if you will equip it with 1-disc coulters you must consider that the play
between the disc and the coulter at the point of the coulter must be 1-2 mm when the play of the
bearings has been removed. The adjustment is done by turning the fastening screw of the disc.
If there is play in the fastening of the front part of the coulter tube you can improve it somewhat by
tightening the screw of the fastening piece of the arm. The arm must be easily movable and it must
be able to fall by its own weight down from the upper position. If the arms are stiff the fastening
pieces of the shaft parts of the arms should be lubricated by dropping oil to the adjoining surfaces of
the arms and the bearings.
16.5.2. Adjustments and repairs of the roll chains
Primary roll chain is situated inside at the right end of the machine, fig. 28. The roll chain must be
kept properly tightened. The tightening is carried out by moving the chain tightener in the groove.
The setting is correct when the slack chain side hangs a little during drive.
Fig. 28. Power transmission chain.
A stretched roll chain must be changed. Pay attention to correct adjustment of the chain lock. Fig.
29.
NOTE Check the tightness of the roll chain of a new machine after the first working day.
Fig. 29 Drive direction of chain
