Section 5: Maintenance & Lubrication
RC(M)5710 & RC(M)L5710 Rotary Cutters 331-433M
6/3/20
56
Remove cutting blades and sharpen or replace as
follows:
1. Secure cutter deck in the up position with solid,
non-concrete supports before servicing the
underside of the cutter.
2. Shut tractor down before dismounting. Refer to
3. Disconnect main driveline from the tractor.
Refer to Figure 5-11 or 5-12 on page 57:
4. Remove rubber plug (#11). Rotate dishpan (#4) until
blade bolt (#1) aligns with access hole (A).
5. Unscrew locknut (#3) to remove cutter blade (#10).
Blade bolt (#1) is keyed and will not turn freely.
6. Both blades should be sharpened at the same angle
as the original cutting edge and must be replaced or
re-ground at the same time to maintain proper
balance in the cutting unit. The following precautions
should be taken when sharpening blades:
a. Do not remove more material than necessary.
b. Do not heat and pound out a cutting edge.
c. Do not grind blades to a razor edge. Leave a blunt
cutting edge approximately 1/16" (2 mm) thick.
d. Always grind cutting edge so end of blade remains
square to cutting edge and not rounded.
e. Do not sharpen back side of blade.
f. Both blades should weigh the same with not more
than 1 1/2 oz. (0.04 kg) difference. Unbalanced
blades will cause excessive vibration which can
damage gearbox bearings and create structural
cracks.
7.
Carefully check cutting edges of blades in relation to
blade carrier rotation to ensure correct blade
placement. Cutter blades must be installed with
cutting edge leading in rotation
.
a. RC5710 and RCM5710 models will have cutting
edge of blades leading in a clockwise rotation.
See figure 5-9.
b. RCL5710 and RCML5710 models will have
cutting edge of blades leading in a counter
clockwise rotation. See figure 5-10.
IMPORTANT:
Cutting blades must be replaced in
mating pairs. Not replacing both blades will result in
an out-of-balance condition that will contribute to
premature bearing breakdown on the spindle hub
and create structural cracks in the cutter housing.
WARNING
!
To prevent serious injury or death:
A locknut that has been removed can lose its thread locking
properties. Reusing a used locknut can result in a thrown
blade. Always use a new locknut when installing blades.
8. Insert blade bolt (#1) through blade (#10),
dishpan (#4), and flat washer (#2). Secure blade with
a new locknut (#3) and torque to 450 ft-lbs (610
N· m
).
9. Replace rubber plug (#11).
10. Reconnect main driveline to tractor power take-off.
RC(M) Blade Rotation
Figure 5-9
RCL(M) Blade Rotation
Figure 5-10
IMPORTANT:
Examine blade bolts and their flat
washers for excessive wear and replace if worn.
30247
Cutting edge
Rear of Cutter
CW Rotation
CW Rotation
72511
Cutting edge
Rear of Cutter
CCW ROTATION
CCW ROTATION