118
1
1
1
1
Fig. 9.14
3
3
2
4
3
3
Fig. 9.15
MAINTENANCE
2 mm
5 kg Push force
Fig. 9.16
9.3 FANS
KEEP THE AIR OUTLETS FREE.
BEFORE STARTING THE SOWING SEASON,
CHECK THAT THE DUCTS OF THE AIR CIR-
CUIT ARE IN GOOD CONDITION.
Mechanical fans
Check the condition of the timing belts sin-
ce natural wear may cause looseness.
To extend the service life of the timing belt,
the machine is equipped with a tensioning
system. To adjust it, follow these steps:
1- Loosen the wing nuts (1, Fig. 9.14) in or-
der to remove the transmission’s lid (2,
Fig. 9.14).
2- Loosen the four nuts of the tensioner (3,
Fig. 9.14).
3- Operate on the screw (4, Fig. 9.14) to ad-
just the tension of the belt.
CHECK THE TENSION OF THE TIMING BELT
BY PRESSING ON IT (FIG. 9.15). CHECK THAT ITS TENSION IS OPTIMAL BY APPLYING A 5 KG LOAD
ON THE POINT THAT IS EQUIDISTANT FROM THE PULLEYS’ AXLES. IF THE TENSION IS OPTIMAL,
THE TIMING BELT SHOULD SHIFT 2 MILLIMETRES AS A CONSEQUENCE OF APPLYING THIS PUSH
FORCE (Fig. 9.16).
4- Tighten the nuts (3, Fig. 9.14) to lock the
pulley’s position.
5- Place the lid back and tighten the wing
nuts (1, Fig. 9.14).
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