Generac Power Systems 6.75 Operator's Manual page 19

Replacing the Trimmer Head Belt (non Self Propelled models)
Tools and Parts needed:

3/8" Wrench

7/16" Wrench

9/16" Wrench

V Belt: 3L440 (Gates #6744)
1. Tip the machine back to access the underside (Figure 25).
2. Remove the Trimmer Cords from the Head Assembly.
3. Remove the four Trimmer Guard Bolts and Flat Washers with a 3/8"
Wrench. Remove the Trimmer Guard.
4. Remove the Locknut that secures the Washer Plate to the flat groove Idler
Pulley using a 9/16" Wrench. Loosen the other Locknut to the V groove
Idler Pulley using a 9/16" Wrench just enough so the Washer Plate can be
rotated out of the way.
5. Remove the flat Idler Pulley and Spacer behind it.
6. Remove the Belt from around the Engine and Head Assembly Pulleys.
Note: You should be able to remove the Belt with the Engine Belt Guide in place,
but if not, remove the Engine Belt Guide Locknuts using a 7/16" Wrench
(Figure 26) to remove the Guide.
7. Install a new Drive Belt around the Engine and Head Assembly Pulleys.
8. Install the Engine Belt Guide if it was removed.
9. Install the small Spacer first, then the Flat Groove Idler Pulley with the Belt
in the groove. Make sure you place the Belt correctly between the Idler
Pulley, Bracket Tab, and Guide Pin (Figure 27).
The Belt must be installed on the inside of the guide Pin as shown in figure
27. If it is not installed on the inside the Trimmer Head will not function
correctly.
10. Rotate the Washer Plate onto the Flat Groove Idler Stud and install the
Locknut using a 9/16" Wrench (Figure 26). Tighten both Idler Locknuts
using a 9/16" Wrench.
11. Position the Trimmer Guard and secure with the four Bolts and Flat Washers
using the 3/8" Wrench (Figure 25).
12. Install the Trimmer Cord and tip the Trimmer down on the Head Assembly.
13. After installing the new Belt, be sure to adjust the tension properly by
adjusting the In-Line Adjuster all the way in (refer to page 24). Proper
tension will extend the life of the Belt.
Note: Before using your Trimmer for the first time or after you have installed a new
Belt, engage the Trimmer Head Engage Bar 10 times and hold it for 3
seconds each time. This is required to wear in the Belt to ensure the best
grip for trimming.
Trimmer Cord
Trimmer
Guard
Figure 25
Flat Groove Idler Locknut
"V" Groove
Idler Locknut
Belt
Engine
Pulley
Figure 26
Belt
Bracket Tab
"V" Groove
Idler Pulley
Figure 27
CONTACT US AT 1-888-545-6576
Bolts and Flat
Washers
Washer
Plate
Engine
Belt Guide
Guide Pin
Flat Groove
Idler Pulley
19