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11.5.1 Special maintenance
A. Special maintenance of the blades (chk knife bolts)
After inserting the blades into the rotor, the blades will bed-in after a brief period. This can
cause the tension on the bolts to decrease, with the risk that the blades may become dislodged
between the blade plates. This can cause irrevocable fatigue failure of the blade shaft. This must
be prevented by scheduling extra maintenance after the brief bedding-in period.
When: Within the first five operating hours after starting up the new machine
Within the first 5 hours after rotating the blades
Within the first 5 hours after changing the blades
What: Check all blade bolts for correct torque loading and retighten if considered necessary.
(torque loading read “16.2 List of torques” on page 78)
Warning:
Failure to perform this special maintenance will compromise the safety of the
operators and bystanders and can cause serious damage to the machine.
B. Special maintenance of the drive belt (Tighten Belt)
The belt that transfers the power from the engine to the blade shaft is long. During the bedding-
in period, the belt will stretch naturally to a certain extent. This stretching will reduce the belt
tension. Using the machine when the belt tension is too low will cause the belt to slip, twist or
wear down. These three possibilities have a detrimental effect on a new belt.
When: Within the first 10 operating hours after starting up the new machine
Within the first 10 hours after changing a belt
What: Check the belt tension (read “11.4.4 Checking the drive belt for correct tension (Chk
Belt Tens.)” on page 60)
C. Special service in relation to replacing the motor oil (Engine Oil)
All wear-and-tear particles and manufacturing dirt that is created or is still present in the motor
will be captured by the oil filter. The fine particles that are not filtered out of the oil will be
cleaned by this special service.
When: Within the first 5 engine hours after starting up the new machine
What: Change engine oil (read “11.3.2 Engine oil change (Engine Oil)” on page 48
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