Flail Head; Cables - McConnel PA 48 Operator's Manual

FLAIL HEAD

Frequently inspect the rotor assembly for damaged or missing flails. Bolts and nuts securing
the flails to the rotor should be regularly checked and kept tight. The correct torque setting
for these locknuts is 135 Nm (100 Ibf/ft.). Use only the correct flail bolt and locking nut.
Check the flail pivot bushes for possible damage or wear - they do not require oil.
Do not attempt to run the rotor with flails missing. Im-balance will cause severe vibration and
can rapidly damage the rotor shaft bearings. As an emergency measure if a flail is broken off
or lost, remove another on the opposite side of the rotor to retain balance. Always replace
flails in opposite pairs and never match up a new flail with a re-sharpened one, which will of
course be lighter.
Blunt flails absorb a lot of power and leave an untidy finish to the work. They should be
sharpened on a grindstone or with a portable grinder periodically.
WARNING
Wear protective gear when sharpening flails.
Ensure that the bearing housings and hydraulic mounting nuts and bolts are kept tight. They
should be checked during servicing.

CABLES

The cables operate on a push/pull system with the spool centering springs always returning
the spool to the neutral position when the handle is released.
Care should be taken during installation and operation to ensure that the cables are not
trapped or kinked. Any abrasion or damage to the outer casing should be sealed with plastic
insulation tape to avoid moisture penetrating.
No routine adjustments of the cables are necessary, as they do not stretch. The threaded
collar is correctly adjusted when the lever is in a vertical position in its housing allowing an
equal amount of travel in either direction.
CAUTION
On no account should any attempt be made to lubricate the cables,
which are assembled with a special lubricant during manufacture.
NOTE
Take care to ascertain the correct cable connections on both the
control unit and the valve in the event of cable replacement.
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