DR Power Self-Propelled Pro-XL Self-Propelled 8.26fpt Subaru - Manual (Page 21)

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11. Install the small Spacer and flat Idler Pulley (Figure 32). Make sure you
place the Belt correctly between the Idler Pulley, Bracket Tab, and Guide
Pin.
12. Rotate the Washer Plate onto the Flat Groove Idler Stud and install the
Locknut using a 9/16" Wrench (Figure 30). Tighten the “V” Groove Idler
Locknut using a 9/16" Wrench.
13. Install the Transmission Cover and secure with the four Transmission
Cover Bolts and Flat Washers using a 3/8" Wrench (Figure 29).
14. Position the Trimmer Guard and secure with the four Bolts and Flat
Washers using the 3/8" Wrench (Figure 28).
15. Install the Trimmer Cord and tip the Trimmer down on the Head Assembly.
16. 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.
The Belt must be installed on the inside of the guide Pin as shown in figure
32. If it is not installed on the inside the Trimmer Head will not function
correctly.
Figure 32
Guide Pin
Bracket Tab
Flat Groove
Idler Pulley
Belt
“V” Groove
Idler Pulley