Section 6: Maintenance & Lubrication
5/24/19
DB2660 & DBM2660 Ditch Bank Rotary Cutter 316-317M
42
Cutter Blade Maintenance
DANGER
!
To avoid serious injury or death:
•
Always secure equipment with solid, non-concrete supports
•
Always disconnect driveline from the tractor and secure
WARNING
!
To avoid serious injury or death:
•
Do not operate cutter with blades that are out-of-balance,
•
Do not attempt to straighten a bent blade or weld on a
Inspect Cutter Blades
Refer to Figure 6-2 on page 43:
Inspect cutting blades before each use. Make certain they
are properly installed and are in good working condition.
Replace any blade that is damaged, bent, worn, or
excessively nicked. Small nicks can be ground out.
1.
Place tractor gear selector in park or set park brake,
turn off engine, and remove switch key to prevent
unauthorized starting.
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.
4.
Replace any blade that is damaged, bent, worn, or
excessively nicked. Small nicks can be ground out
when sharpened. See
page 42 for detailed instructions.
IMPORTANT:
Replace cutting blades with genuine
Land Pride blades only. Blades must be replaced in
sets. Not replacing blades in sets will result in an
out-of-balance condition that could contribute to
premature bearing wear/breakage and/or structural
cracks in gearbox and/or deck.
Cutter Blade Removal
Refer to Figure 6-2:
1.
Make sure tractor is shut down properly. Refer to
steps 1 & 2 on page 42.
2.
Remove access cover (#6).
3.
Rotate blade bolt (#1) until in alignment with access
hole “A”.
4.
Unscrew locknut (#3) to remove cutting blade (#5).
Blade bolt (#1) is keyed and will not turn freely.
Blade Sharpening
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:
1.
Do not remove more material than necessary.
2.
Do not heat and pound out a cutting edge.
3.
Do not grind blades to a razor edge. Leave a blunt
cutting edge approximately 1/16" thick.
4.
Always grind cutting edge so end of blade remains
square to cutting edge and not rounded.
5.
Do not sharpen back side of blade.
6.
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.
Blade Installation
Refer to Figure 6-3:
1.
Make sure tractor is shut down properly. Refer to
steps 1 & 2 on page 42.
2.
Carefully check cutting edges of blades in relation to
blade carrier rotation to ensure correct blade
placement. Blade Rotation is clockwise with cutting
edge leading. Airfoil (lift) must be oriented towards
the top of the deck.
Refer to Figure 6-2:
WARNING
!
To avoid 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.
3.
Insert blade bolt (#1) through blade (#5), dish
pan (#4), and flat washer (#2). Secure blade with a
new locknut (#3)
and torque to 450 ft-lbs.
4.
Replace access cover (#6) and secure with flat
washers (#7), lock washers (#8), and wing nuts (#9).
Tighten wing nuts until lock washers are flattened.
IMPORTANT:
