Hammermill Maintenance - Haybuster H-1130 Operating Instructions And Parts Reference

3.4

Hammermill maintenance

Visually examine the mill to see if any of the internal parts show excessive wear. These parts should include rotor discs
and the holes in the discs that support the rods. Enlarged holes can cause rods to break or bend. Also check rods, rod
locking or retaining devices, hammers, screens, screen tracks and hold downs, main shaft, platform locking devices,
hinges or anything else that could wear and perhaps fail and causing damage to the hammermill and/or personnel safety
if not properly maintained. The bearings should also be checked along with mounting bolts to insure a firm foundation
and reduced vibration.
CAUTION: Keep all foreign objects out of the tub and away from the mill. Foreign objects may
result in personal injury or damage to the machine.
The hammers have been designed and manufactured to provide the best compromise between hardness for good
wearing qualities and strength for dependability and resistance to breakage.
WARNING: The hammers have been heat treated, and any alteration of the hammers by heating,
grinding, resurfacing or any other process can change the mechanical properties of the hammer and
make it unsuitable or dangerous to use.
Because of the high capacity of the machine, the hammers will wear and must be considered expendable. Each hammer
has four cutting edges. For maximum life, it is suggested that hammers be rotated periodically to even out the wear
over the entire rotor. If one end of a hammer is allowed to wear too long, one of the hammer's cutting edges will be
lost.
Screens also have two cutting edges. When cutting edges become rounded, the screen can be turned end for end
exposing the new cutting edges. The results of badly worn hammers and screens is loss of capacity, and added horse
power requirements.
Hammer rods are case hardened to maximize wearability and toughness, although hammer rods must be considered
expendable.
NOTE: Hammer and hammer rod life can be extended by keeping rotor rotating at 2300 RPM.
Over powering or over feeding the rotor will cause the swinging hammers to lay back resulting in
excessive wear on both the hammers and the rods.
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