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2009 DURATECH TUB GRINDER OPERATING INSTRUCTIONS
5.13 Hammermill maintenance
Visually examine the mill to see if any of the internal parts show excessive wear. These parts should include liners,
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 if not properly maintained. The bearings and motor alignment should also be checked along with mounting
bolts to insure a rm foundation and reduced vibration.
Because of the high capacity of the machine, the hammers will wear and must be considered expendable. Each xed
hammer has two (2) cutting edges and each swing hammer has two (2) 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 (2) 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.
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.
The hammers are designed to grind products such as wood waste, green waste, construction and demolition debris,
tree branches and trunks, compostables and mulch that may be reduced in size in a hammermill. The hammers are not
designed to grind or crush hard materials such as coal, minerals, metals, rock, or other incompressibles, which will
cause parts to fail. These materials must never be allowed to enter a hammermill.
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.
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.
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 2000 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.
( REV. 08-04 )
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