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2009 DURATECH TUB GRINDER OPERATING INSTRUCTIONS
5.14 Fixed hammer maintenance and replacement
CAUTION: Disengage the driveline clutch. Shut off the engine. Remove the key before working
on the rotor.
IMPORTANT: The bolts on the hammer tips should be checked periodically for proper torque.
Torque ratings for two bolt tips are listed below.
When replacing hammer tips, We recommend the following:
A. Always replace xed hammer tips in pairs, 180 degrees apart (same as with the swinging hammers,
illustrations A & B gure 5.9).
B. Tips placed 180 degrees apart should be the same weight.
C. When starting the hammermill after installing a new set of tips or after turning the tips to expose new
faces, watch for unusual or excessive vibration. If any is noticed, shut off the hammermill. Determine
the cause and correct it before starting the mill again.
To replace the hammer tips on machines with xed hammers, perform the following steps:
1. Be sure to disengage the clutch, shut down the engine, and remove the key.
2. Identify the tips to be removed, then loosen and remove the bolts and tips.
3. Rotate or replace tips. Use new bolts and lock nuts when replacing tips.
4. FIXED HAMMER TORQUE SPECIFICATIONS
For two‑bolt tips with 5/8” NF grade 8 bolts and grade 8 lock nut, Torque to 190‑210 ft.lbs. (26‑29 Kg‑m)
For one‑bolt tips with 7/8” NF grade 9 bolts and grade 9 toplock nut, Torque to 509 ft. lbs. (70 Kg‑m)
5. After 2 hours of grinding, retighten the bolts to the same torque values.
6. Periodically retighten the bolts to the same torque values.
( REV. 09-17 )
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