Maintaining the Shredder Hammers
When the hardened steel Hammers become dull or round on the cutting edge,
they should be reversed or replaced. Please purchase 4 new Center Locknuts
A0004377071 from DR Power Equipment (1-800-DR-OWNER (376-9637)) before
reversing or replacing the Hammers.
Note: The Flat Hammers have four cutting edges, and the J Hammers have two
cutting edges that may be used before replacement is necessary. To reverse the
Hammers, proceed as follows:
Tools and Part Required
• (2) 1/2" Wrenches
• 3/4" Wrench
• 3/4" Socket
• Feeler Gauge
• (4) A0004377071 Nut, Center Lock
1. Remove the two Bolts and Locknuts Securing the Shedder Hopper using two
1/2" Wrenches (Figure 23) and remove the Shredder Hopper from the
machine.
2. Remove the four Locknuts securing the Chipper Chute using two 1/2″
Wrenches (Figure 24). Remove the Chipper Chute.
3. Loosen the Locknuts on the Access Plate using a 1/2″ Wrench, slide the
Plate to the side to align the holes with the Locknuts, and remove the Access
Plate (Figure 25).
Note: There is 1 J Hammer and 1 Flat Hammer (PREMIER 320) or 2 Flat
Hammers (PRO 420) on each Hammer Shaft. J Hammers are oriented in
the opposite direction of those on adjacent Hammer Shafts (Figure 26).
• Before performing any maintenance procedure or inspection, stop the
Engine, wait five minutes to allow all parts to cool. Disconnect the
Spark Plug Wire, keeping it away from the Spark Plug.
• The Locknuts used to secure the Hammers are a one-time use
Locknut. Each time you do any maintenance on the hammers you
must use new Locknuts to reinstall the Hammers after removal.
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