
Maintenance – Mowing Units
346
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BiG M CV
BiG M CRI
BM 400 0141
2
3
1
4
2
3
1
4
a
b
a
b
Fig. 305:
For protection against overload on the mowing units, the rotary hubs (1) are secured with nuts
(2) and shear pins (3).
If the machine strikes obstacles (for example stones), the 2 shear pins in the rotary hub will be
sheared off. The rotary hub and nut turn upward on the pinion shaft.
• The cutting discs or drums which move crop to the left (in the direction of travel) (LH)
have left-handed threading.
• The cutting discs or drums which move crop to the right (in the direction of travel) (RH)
have right-handed threading.
To distinguish between right-hand (clockwise) rotation (RH) and left-hand (anti-clockwise)
rotation (LH), the nuts (2) and pinion shaft (4) for left-hand rotation (LH) have a distinctive grove
(a, b).
• Left-handed (LH) nuts (2) have distinctive grooves (a) on the bevel.
• Left-handed (LH) pinion shafts (4) have a distinctive groove (b) on the face.
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