DR PRO XL520 - Page 29

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Removing and Replacing the Clutch
The Clutch on your machine is designed for rugged, dependable service. However, it is important to understand the limitations of
a Clutch. The Clutch provides load free starting of the Engine and provides slippage under excessive overloading of the driven
application. These features help protect the Engine from damage such as broken crankshafts and starters. The Clutch on this
machine is permanently lubricated and does not require oil or grease. The Drum, Shoes, and Springs in the Clutch are normal
wear items. If you notice decreased performance of the Clutch, check, and replace it if necessary.
The Clutch obtains its power from the Engine RPM. The higher the maintained Engine speed, the more torque the Clutch can
transfer to the driven unit. NEVER operate the DR PRO XL520 CHIPPER-SHREDDER Engine at less than full RPM.
Note: At Engine start-up, the Engine of your Chipper-Shredder operates under no load until approximately 1800 RPM, at which speed
the Centrifugal Clutch engages and begins driving the Rotor.
Installing a new Clutch Assembly
Tools and Supplies Needed:
• 5/8" Wrench or Air Wrench and 5/8" Socket
• Anti-seize compound
1. Remove the Belt Guard and Belt (see “Removing and Replacing the Drive
Belt” in this Chapter).
Note: You may need to use an Air Wrench to break the Clutch Bolt loose depending
how tight it is on the Engine shaft.
2. Remove the Clutch Bolt and Flat Washer, using a 5/8" Wrench (Figure 49).
3. Remove the Clutch from the Crankshaft.
4. Remove the Key from the keyway in the Engine Crankshaft and set it aside.
5. Clean the Engine Crankshaft and remove any burrs, then apply Anti-seize
compound to the Crankshaft.
6. Install the Key in the keyway of the new Clutch Hub, align the Key with the
slot in the Engine Crankshaft, and slide the new Clutch Assembly onto the
shaft.
7. Secure the Clutch with the Flat Washer and Clutch Bolt using a 5/8"
Wrench.
Figure 49
Clutch
Bolt and
Flat Washer
• Do not tamper with the Engine’s Governor setting. The governor controls the maximum safe operation speed and protects
the Engine. Over-speeding the Engine is dangerous and will cause damage to the Engine and to the other moving parts of the
machine. See your authorized dealer for any Engine Governor adjustments.
•
Become familiar with successful operating conditions and avoid those that can overload and damage the machine.
•
Do not overload or attempt to chip material beyond manufacturer’s recommendation. Personal injury or damage to the
machine could result. Learn to recognize the sound of the machine during an overload condition. Only your operator
experience will tell you how fast you can successfully feed material into the machine.
•
If overloading or any other cause jams the machine, stop the machine immediately. If you jam the machine and do not stop
the Engine, it can burn the Drive Belts and/or ruin the Clutch. Clutch damage can be costly, and it may not be covered under
warranty. For this reason, it is important that you immediately shut off the machine if it becomes jammed.
• The Centrifugal Clutch on this machine is permanently lubricated and does not require Oil or Grease. If, after long periods of
use, the Drum wobbles excessively, replace the Clutch assembly.