Wallenstein BXMT Series, Operator'S Manual

Page: 37 / 48

7.7 Rotor Blades
Observe rotor blade sharpness at each use. Sharpen every
50 hours of operation.
The rotor and ledger knives need to be sharp for the best
performance. Periodic inspection is recommended. Keep the
blades sharp to reduce the amount of power required during
operation.
Check blade sharpness more often if processing material with
a lot of sand, soil or dirt in it.
If the chipper is not pulling the
material or material must be pushed into the chipper, the
edges of the rotor blades have rounded over and are probably
dull.
Reverse or sharpen the blades if the cutting edges become
dull. When replacing, reversing or sharpening, always do both
blades.
Rotor Blades, Changing
CAUTION!
Risk of getting hands pinched or wedged
between lower rotor housing and rotor. Turn
rotor slowly and be aware of hand positioning.
W032
Procedure
1. Open the upper rotor housing. Turn the rotor around by
hand as required to access the blades.
2. Check whether the blades can simply be rotated (turned) or
need to be removed to be sharpened or replaced.
IMPORTANT! Rotor blades can be sharpened on both sides
as long as the correct clearance between them and the
ledger knife is maintained.
3. To sharpen, remove both blades from the rotor.
4. Sharpen each at a 45° angle to provide the best cutting
effect.
45°
01097
Fig. 40 – Sharpen Blade at 45° angle
IMPORTANT! Make sure equal amount of material is
removed from EACH blade when sharpening to maintain
proper rotor balance.
5. Install rotor blades with leading edge out, towards the
ledger knife as shown. Tighten the blade mounting bolts to
45 lbf•ft (63 N•m) .
01095
Fig. 41 – Rotor blade leading edge outward
IMPORTANT! If replacing or sharpening a blade, do the
opposite one on the rotor as well to maintain rotor balance.
The clearance must be the same for each blade as it passes
the ledger knife.
7.8 Ledger Knife
Observe Ledger Knife sharpness at each use. Sharpen every
50 hours of operation.
Material in the chipper is sheared off at the stationary ledger
knife as the rotor blades pass by.
The ledger knife can be turned or rotated so that all four edges
on the long sides of the blade can be used. When the corner
facing the rotor blade rounds over, remove the blade and
re-install with a different corner facing the rotor blades.
Once all four corners have rounded over, remove the blade and
sharpen it. If the blade has been sharpened on both ends to the
point where proper clearance is no longer possible, replace the
blade.
Adjusting Clearance
BXMT3209
Trailer Chipper-Shredder
Service and Maintenance
37