8999118EN: v1.1 21/12/2020
44
Original instructions (ENGLISH)
Website: www.spearheadmachinery.com
9.2.3
Rotor Shaft
If vibration of the rotor occurs stop the machine immediately. This is often a sign that a flail is either missing or
severely damaged. If this is the case
DO NOT
use the machine until the problem has been rectified. If vibration
continues, or occurs for no apparent reason, the rotor must be checked by an authorised workshop and if
necessary rebalanced before using the machine again. Contact your local dealer for further advice or assistance
on this subject.
WARNING!
Check flails daily. Check that flails are in good condition and securely attached to the rotor
shaft. Replace any that are damaged. When replacing a flail always replace the retaining bolt
and locknut at the same time.
CAUTION!
Vibration of the rotor shaft will cause premature failure of the rotor shaft bearings. It is
important not to operate the machine with the cutting unit vibrating.
As soon as any vibration is felt stop operating the machine and make the checks listed below:
Stop tractor engine and disengage PTO drive.
Lower the flail mower on to axle stands and ensure it is supported safely.
Check daily for missing or worn flails. Always replace missing or worn flails in pairs opposite each
other to maintain shaft assembly balance.
IMPORTANT:
A New flail must always be fitted with a new retaining bolt and locknut.
Check that the retaining bolts are in good condition. If any are found to be bent or in poor condition,
then even if the flail is still good, replace the bolts and locknuts together.
Check that the securing locknuts are visibly tight. If any nuts are loose
do not
re-tighten the old
locknut. Always replace with a new locknut and tighten.
Note:
Locknuts deform once, on fitting, to
provide a prevailing torque (a torque-off resistance). The prevailing torque prevents the nut from
coming loose due to vibration. If a locknut is subsequently re-tightened, then this protection is lost.
IMPORTANT:
Only fit genuine Spearhead spare parts.
If any flails were missing or loose and have been replaced or tightened, run the rotor and retest for
vibration. If vibration is still present, check rotor shaft bearings as follows;
•
Stop tractor engine and disengage PTO drive.
•
Check rotor shaft bearings for roughness or signs of slackness.
•
Replace the bearings if either of the above symptoms is found.
•
If vibration persists it is an indication that the rotor shaft is probably bent and must therefore be
replaced.
