Bandit
50
Copyright 6/18
MODEL 2590
TROUBLE SHOOTING CHIPPER PROBLEMS
CHIPPER SECTION
Knives should be replaced in sets. These sets are determined by the amount of resharpening done to the
knives. It should be reinstalled with another knife of comparable usage. It helps to keep the disc/drum balanced,
and it helps maintain chip quality. NEVER
allow these knives to wear beyond absolute specified minimum
distance from the center line of bolt.
5/8” x 6” (15.9 mm x 152.4 mm)
Babbitt Chipper Knife
5”
(127 mm)
Min.
30°
MAINTENANCE
KNIFE SAVER KIT
Through various tests, Bandit has found that using
the Knife Saver will increase the life span of chipper
knives if used during the recommended times.
Each knife installed in every new machine at Bandit
has the Knife Saver used on it before leaving the
factory. The Knife Saver can be purchased from
your local Bandit dealer.
- Use the Knife Saver on brand new knives.
- Use the Knife Saver on freshly resharpened knives.
- Use the Knife Saver every day during the Daily
Start-Up & Maintenance while the knives are checked.
- Use the Knife Saver when the machine is shut
down for a break during the day.
PART NO.
DESCRIPTION
500-0001-16 Knife Saver Kit
900-9901-65 File For Knife Saver Kit Only
900-9914-29
Replacement Blades For Knife Saver
900-9914-24 Knife Changing Gloves
If anvil is not too worn, the four
working edges can be ground or
machined to repair.
NOTE: Make sure the anvil clearance will still be
obtainable after grinding or machining.
FIGURE 1
1. Chipper makes poor quality chips or does
not feed properly.
A. Improper lubrication - Grease with 16
pumps every 120 hours or once a month
with an NLGI #2, lithium - complex grease
with an base oil viscosity of 220 cSt for
example (Mobil XHP 222) Multi-Purpose
Grease NLGI#2.
B. Chipper drum operating at too high RPM’s.
DO NOT exceed recommended RPM’s.
C. Check the chipper bearing locking collars
or locknut for tightness.
D. Bearings worn out (REPLACE).
4. Chipper Bearings Running Too Hot.
A. Lugging engine on large material - keep
engine RPM up.
B. Knives are dull or worn to minimum size.
C. Obstruction in discharge chute. Patches
welded into the chute can cause obstruction
of chip flow. Anything causing an obstruction
will cause the chute to plug.
D. Chipping rotting material that has little
substance can also plug the discharge chute.
E. Worn fan blades.
3. Discharge Plugs or Does Not Throw Chips
Properly.
A. Check the anvil clearance at both sides of the
knife by using a feeler gauge, the clearance
should be approximately .120” (3.0 mm) from
the highest knife.
B. Check the chipper bearing bolts for tightness
(SEE TORQUE CHART).
2. Chipper Knife Hits Anvil.
A. Knives have lost their edge. File, sharpen or
replace knives. DO NOT operate the Bandit
with dull knives.
B. Knife anvil worn or needs adjustment.
Rotate, repair or replace (see Figure 1).
C. Feedwheel(s) are not operating correctly.
(SEE HYDRAULIC TROUBLE SHOOTING).
D. The throat/base opening is a high-wear area.
The feed plate anvil takes much of this wear
but other areas wear as well. Attention must
be paid to any areas where outer, noncutting
edges of chipper knife are exposed. These
areas must be built up with weld to maintain
the original integrity.
E. Knives are at the wrong angle. Knives must
be sharpened at a 30° to 30 1/2° angle.
F. Feedwheel teeth worn (REPLACE).
G. Material being chipped is very small, dry
or rotting. This type of material does not
produce good chip quality.
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