Blade Servicing
The chipper blades will eventually become dull, making chipping difficult and adding strain on the machine. Poor chipping performance is usually a result of dull chipper blades. It is recommended that the blades be sharpened every 5 to 15 hours or if the chipper’s per- formance has decreased. Check for the following symptoms and sharpen the blades as needed.
●Severe vibration when feeding material into the chipper.
●Small diameter branches do not
●Chips discharge unevenly or have stringy tails, especially when chipping green branches.
Blade Removal & Cutting Edge Reversal
1.Remove the discharge cap or optional discharge tube from the chipper housing.
2.Install disk lock. See Install Disk Lock, page 17. The disk is restrained to remove blade.
3.Remove blade by removing lock nuts from chipper disk.
4.Inspect blades for cracks or nicks in cutting edge.
5.Turn cutting edge over and use new edge or sharpen if both edges have been used.
6.Remove disk lock, rotate chipper disk, align holes, insert disk lock, and remove blade, turn cutting edge or sharpen second blade.
7.Install discharge cap or optional discharge tube when blades have been reworked.
Blade Inspection
Before you sharpen the chipper blades, check for per- manent damage. Replace if:
●There are cracks, broken corners or nicks greater than 1/8 inch. See Figure 5.
●The base of the cutting edge is worn or has been sharpened so that the edge extends less than 1/16 inch above the rotor chipping slot.
LA2 |
Figure 5. Inspect Blades
Blade Sharpening
1.Never sharpen or grind the mounting surface of the blades. This will cause the edge to roll and the blade will be damaged, resulting in poor chipping performance.
2.Regrind the angled edge of the chipper blade to
3.The blades can be ground on a bench grinder of a professional.
4.Make sure some type of fixture is used to correctly hold the blade at the proper angle.
5.Be careful when grinding so that the blades does not become overheated and change color. This will remove the
6.Use short grinding times and cool with water or some type of liquid coolant.
7.Remove an equal amount off each side of the blade to maintain rotor balance.
8.Small imperfections such as nicks and burrs on the flat side of the blade will not affect the chipping performance of the machine,
9.For blades that have been repeatedly sharpened, make sure that the sharpened surface extends past the chipping slot opening. If it does not extend past the opening, the blades must be replaced.
Sharpen Surface | Sharpen | |
.38 | ||
Surface | ||
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45° | Mounting Surface | |
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| Do Not Grind | |
| LA3 |
Figure 6. Double Edge Blade
Blade Installation
1.Lock disk assembly. See Install Disk Lock, page 17.
2.Place blade on the disk and secure into position using two 1/2 x
3.Remove disk lock, rotate disk assembly, install disk lock, and install second blade.
4.Install discharge cap or optional discharge tube.
18 Service | MAN0458 (9/23/2005) |
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