Blade Removal - Bush Hog 1812 Operator's Manual

BLADE SHARPENING
Always sharpen both blades at same time to maintain balance. Follow original sharpening pattern as shown in
FIGURE Mnt-R-0008. Always sharpen blades by grinding. DO NOT heat and pound out edge. Do not sharpen
blade to a razor edge, but leave a 1/16" blunt edge. Do not sharpen back side of blade.
IMPORTANT: When sharpening blades, grind each blade the same amount to maintain balance. The
difference in blade weights should not exceed 1 ounce. Unbalanced blades will cause excessive vibration
which can damage gear box bearings. Vibration may also cause structural cracks in cutter housing.
Never work under equipment supported by a hydraulic device because it may drop if the
control is actuated (even with the engine stopped) or in the event of hose failure, etc. Always
use a secure support for equipment which must be serviced while in the raised position.
NOTE: Replace Blades in pairs after no more than 1/2" notch wear!

BLADE REMOVAL

It is not necessary to remove the complete blade
holder assembly to replace the blades. Blade bolts
are accessible through a hole in the top of the cutter
deck. Always replace both blades on a spindle using
two blades having the same weight. Use only
genuine Bush Hog replacement blades.
1. Remove nuts from blade bolts. A blade nut
socket (Part No. 6432BH) can be bought at
your Bush Hog dealer and used with an
adjustable wrench (not supplied) to remove
blade nut. Blade nut can also be removed with
a 1-11/16" socket.
2. Inspect blade bolt shoulder for wear. Replace
if necessary.
3. Assemble new blades to blade holder using
blade bolts, nuts and lockwashers. Refer to
BLADE ROTATION DIAGRAM for blade
placement. Tighten nuts to 450ft./lbs if lubed,
600 ft./lbs. if dry. Strike blade bolt head with
heavy hammer to seat, then re-tighten.
4. Check to be sure blades swing 360º freely. If blades will not swing freely, remove, locate problem, and
repair. Operating cutter when blades will not swing freely will cause excessive vibration, damaging
implement.
1812 08/14
©2014 Alamo Group Inc.
MAINTENANCE
Maintenance Section 5-10