Bolens 452 Thru 465 Manuales De Servicio

Make certain chipper 
blades are reassem-
bled with the sharp 
edge facing upward. 
Torque hardware to 
250 - 300 in. lbs.

6.  Remove the blade by removing the internal hex 

screws, lock washers, and hex nuts which secure it to 
the impeller. Retain the hardware. See Figure 5-3.

NOTE: Use a 3/16” hex key (Allen) wrench on the outside 
of the blade and a 1/2” box (or socket) wrench on the 
inside of the impeller. Hold the Allen wrench stationary 
and rotate the box (or socket) wrench to loosen the nut.

7.  Install a replacement blade (Part No. 781-0490) with 

the hardware removed earlier or sharpen.

IMPORTANT: When sharpening the blade, protect hands 
by using gloves. Follow the original angle of grind and 
make sure to remove an equal amount from each blade.

8.  To replace the other blade, rotate the impeller to 

expose the second blade and repeat the steps above.

NOTE:  Make certain blades are reassembled with the 
sharp edge facing upward. Torque hardware to 250 - 300 
in. lbs.

1.  Stop the engine and make certain that all moving 

parts have come to a complete stop.

2.  Disconnect the spark plug wire and ground against the 

engine.

3.  Lower the hopper assembly and block up the housing.
4.  Remove the six hex lock nuts and flat washers 

from the weld studs on the flail housing. Retain the 
hardware.

5.  Carefully separate the hopper assembly from the 

impeller assembly and remove the support plate.

NOTE: When reassembling the support plate, make 
certain the embossed tab faces inward towards the 
impeller.
6.  Remove the two wing knobs and cupped washers that 

secure the chute deflector and raise the chute.

7.  Insert a 1/2” or 3/4” diameter pipe through the flail 

screen into the impeller to keep it from turning or 
remove the flail screen and insert a piece of wood into 
the chute opening. 

8.  a. Remove the two internal hex screws, lock washers, 

and hex lock nuts which secure the shredder blade 
to the impeller.

  b. Remove the hex bolt, lock washer, and flat washer 

to completely free shredder blade. See Figure 5-4.

NOTE: Use a 3/16” hex key (Allen) wrench on the 
outside of the shredder blade and a 1/2” box (or socket) 
wrench on the inside of the shredder blade. Hold the 
Allen wrench stationary and rotate the box (or socket) 
wrench to loosen the nut. Use caution when removing 
the blade to avoid contacting the weld studs on housing.

IMPORTANT:  When sharpening the blade, follow 
the original angle of grind as a guide. It is extremely 
important that each cutting edge receives an equal 
amount of grinding to prevent an unbalanced blade. 
An unbalanced blade will cause excessive vibration 
when rotating at high speeds and may cause damage 
to the unit. The blade can be tested by balancing it on a 
screwdriver or nail. Remove metal from the heavy side 
until it is balanced evenly.

The following steps should be taken to prepare your 
chipper shredder for storage.
1.  Clean the equipment thoroughly.
2.  Wipe equipment with an oiled rag to prevent rust.
3.  Refer to engine manual for correct engine storage 

instructions.

4.  Store unit in a clean, dry area. Do not store next to 

corrosive materials such as fertilizer.

When reassembling the 
shredder blade, tighten 
center bolt to between 
550 and 700 in.-lbs. 
and the two out bolts to 
between 250 and 350 
in.-lbs.

A

A

B