Echo 71755 User Manual

Instructions

SUBJECT: 12-BLADE CUTTER

RETRO FIT KIT # 76903-00

FITS MODELS: ALL STUMP GRINDERS

SERIAL # 0 - CURRENT

WARNING

Before inspecting or servicing any part of this machine,
shut off power source and make sure all moving parts
have come to a complete stop.

3. Loosen the four engine mounting bolts. Two bolts are
located on top of the engine mount plate (see below).
Two are located on the other side of the engine under
the engine mount plate.

Loosen these bolts

12 BLADE CUTTER RETROFIT KIT, PN 76903-00

PART

NUMBER

76904-00

These instructions will describe how to install the 12-blade
retro fit cutter on stump grinders that currently have a
4-blade system.

1. Shut off engine and allow all moving parts to come to
a complete stop.

2. Take off the top cover of the stump grinder by removing
the seven bolts on the sides.

DESCRIPTION OF PARTS

INCLUDED IN KIT

ASSY., RETROFIT SG 12 BLD
CUT

QTY

1

4. Loosen the nut on the back of the machine (see
below) and push the engine slightly forward to take
tension off the drive belt and spring.

Loosen this nut

Instruction Sheet

PN 76905-00

Rev. 092010

5. Remove the three bolts in the bushing (shown below). Screw these three bolts into
the threaded holes that had been previously unused. Tighten the bolts an equal
amount until the bushing and sheave loosen and can be removed.

6. Loosen the set screw in bushing.

7. Remove the spacer, spindle and blades as shown below. Discard.

8. Replace with new spacer, spindle and blades. Assemble by inserting spindle into
cutter head and fastening with 1/2 X 3/4" bolt and washer. (See Figure 1.) Torque
bolt to 70 ft. lbs.

9. Replace bushing and sheave.

10. Insert bolts back into the non-threaded holes in the bushing and thread into sheave
before tightening evenly. Torque to 108 inch/lbs, making sure that the two pulleys are
alligned to ± 1/16 inch.

11. Tighten the belt by adjusting the motor position so there is a 1/32" gap between the
coils of the spring. Once the 1/32" gap is achieved, tighten down nut shown in step
4 tighten the engine mounting bolts shown in step 3.

SPINDLE

BEARING

4 BLADE
ASSEMBLY

BUSHING

SHEAVE

SPACER

BEARING

CUTTER HEAD ASSY.

WASHER

1/2 X 3/4" BOLT

Figure 1

SPACER

12 BLADE
ASSEMBLY

ECHO BEAR CAT

www.bearcatproducts.com

237 NW 12th Street, West Fargo, ND 58078-0849

Phone: [phone] • Toll Free: 888.645.4520 • Fax: [phone]

E-mail: [e-mail] • [e-mail]