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Section 5: Maintenance & Lubrication
Cutter Blade Maintenance
Refer to Figure 5-1 on page 25:
IMPORTANT: Only replace cutting blades in pairs
with genuine OEM blades. Replacing single blades
can result in an out-of-balance condition that will
contribute to premature bearing wear/breakage and/
or structural cracks in gearbox and/or deck.
Always inspect cutting blades before each use. Make
sure they are properly installed and in working condition.
Replace any blade that is damaged, worn, bent, or
excessively nicked. Never try to straighten a bent blade!
1.
Place tractor gear selector in park and/or set brakes,
shut engine off and remove ignition key.
2. Disconnect main driveline from tractor power take-off
and secure cutter deck in the up position with solid
supports before servicing underside of cutter.
3. Inspect cutting blades. Make certain they are
properly installed and are in good working condition.
Replace any blade that is damaged, worn, bent, or
excessively nicked. Small nicks can be ground out.
4. Remove access cover (#5) and rotate blade bolt (#1)
until aligned with blade bolt access hole (A).
5. Unscrew locknut (#3) to remove cutting blade (#6).
Blade bolt (#1) is keyed and will not turn freely.
6. Repeat steps 4 to 5 for the other blade.
7.
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. 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" 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. difference. Unbalanced blades will
cause excessive vibration which can damage
gearbox bearings and create structural cracks.
Refer to Figure 5-2:
8. Carefully check cutting edges of blades in relation to
blade carrier rotation to ensure correct blade
placement. Blade rotation is counterclockwise with
cutting edge leading. Airfoil (lift) must be oriented
towards the top of the deck.
26
RCR1884 Model Rotary Cutter 312-880M
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Refer to Figure 5-1 on page 25:
IMPORTANT: Examine blade bolts, washers, and
bushings for excessive wear and replace if worn.
IMPORTANT: 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.
9. Insert blade bolt (#1) through blade (#6), dish
pan (#4), and flat washer (#2). Secure blade with a
new locknut (#3) and torque to 450 ft-lb.
10. Repeat step 9 for the other blade.
11. Replace access cover (#5).
12. If replacing dishpan (#4), nut (#7) on gearbox output
shaft should be torqued to 450 ft-lbs. minimum and
cotter pin (#8) installed with both legs bent opposite
directions around nut (#7).
Blade Bolt Access
Hole and Cover
Counterclockwise Blade Rotation
Figure 5-2
Counterclockwise
Blade Rotation
11/12/18
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