8999129: v1 11/09/2018
Page 8.4 of 8.5 pages
Original instructions (ENGLISH)
Website: www.spearheadmachinery.com
1
A
B
8.6
Blade bar
WARNING!
Ensure that the machine is safely supported using suitable lifting and support equipment before
attempting to work beneath a machine
– never use or rely on the tractor’s hydraulic system to support
the machine
8.6.1
Blade bar Maintenance
Check the rotor hub for slack. Some settlement may occur after the first hours of working. Re-tighten the castle
nut one quarter of a turn at a time, and back off until the split pin can be fitted. Repeat until the slackness is
removed. Check the blade carrier mounting bolts for tightness, see Figure 8.5.
8.6.2
Removal and replacement of Blade carrier assembly
Lift and support the machine on safety supports. With assistance,
support the blade carrier assembly, remove the split pin (K) and
rotor castle nut (J) in Figure 8.4 and remove the whole blade
carrier assembly from the splined gearbox output shaft through
(B), see Figure 8.3.
Replacement is the reverse of the removal procedure above.
Tighten the mounting bolts and castle nut according to torque
settings, see Figure 8.5.
Figure 8.3
WARNING!
Ensure that the opposing blade carriers and blades are at 90degree to each other after any
maintenance that requires removing or replacing the gearboxes.
8.6.3
Blade bar removal
If necessary, the blade bar (G) in Figure 8.4 may be removed and replaced without upsetting the driveline timing.
Undo four fasteners (A) in Figure 8.3. The blade bar with blades attached can be removed.
8.6.4
Blades and blade bushes maintenance
The cutting blades are mounted in bushes and are free-swinging
to reduce shock load and damage to the transmission. Blades
and blade bushes should be inspected for wear/damage the
intervals stated in the regular maintenance chart, see section 8.1.
Replace blades that are bent, excessively nicked, damaged, or
when they are worn beyond the shape of their original profile.
Always replace blades immediately when their level of wear or
damage causes rotor vibration; continued use of the machine in
this condition could cause damage to gearbox and/or drive
components. Blades must always be replaced in opposing pairs
to retain rotor balance. Replace bushes and blade fixings
immediately should excessive signs of wear or damage be detected.
Figure 8.4
NOTE:
On twin rotor machines the cutting blades on the left and right blade carriers are not interchangeable
due to their different rotation direction.
8.6.5
Blade & Blade bush removal and replacement
To Remove: Unfasten blade bolt (C), locknut (E), flat washer (J) in Figure 8.4 and discard. Dismantle the blade
(D) and blade bush (F).
To replace: Fit the blade and/or the bush and reassemble to the blade bar or carrier assembly with a new
locknut (E), bolt (C) and flat washer (J). Tighten the blade bolt (C) and locknut (E) to torque value in Figure 8.5
WARNING!
Blades must always be replaced in opposing pairs to retain rotor balance.
NOTE:
On Twin Rotor machines the cutting blades on the left and right blade carriers are not interchangeable.
E
H
G
D
C
F
F
D
C
J
J
