CONTACT US AT www.DRpower.com 23
Before replacing the brake arm, check that the mounting of the belt is on the correct side of the idler pulleys (see figure 35 on
page 22), and not frayed, worn or stretched. Also, see “adjusting the trimmer head belt tension through the trimmer control
cable” on page 28.
Use only DR belts on your machine. Do not use hardware store variety belts.
Drive Belt – PRO-XL SELF-PROPELLED
Tools and Part needed:
7/16" Wrench
3/8" Wrench
DR Drive Belt #179581
1. Remove the Mow-Ball™ Support
Assembly. See “Removing the
Mow-Ball™ Support Assembly”
on page 19.
2. Remove the Bottom Shield. See
“Bottom Shield” on page 21.
3. Remove the Trimmer Head Belt
from around the Engine Pulley.
There is enough slack in the Belt
to just peel the Belt from around
the Pulley.
4. Grasp the Transmission Housing
and rotate it out to loosen the
Drive Belt (Figure 38). Be careful not to overextend the spring. You can now remove the Belt from the Transmission Pulley and
upper Engine Pulley. The Transmission Housing is spring loaded so it will return to its original position when released.
5. Install a new DR Drive Belt around the upper Engine Pulley, rotate the Transmission Housing out, and slip the Drive Belt
around the Transmission Pulley. Allow the Housing to return to its resting position with the Belt in place.
6. Re-install the Trimmer Head Belt on the Lower Engine Pulley.
7. Re-install the Bottom Shield and the Mow-Ball™ Support Assembly.
Brake Arm - All models
Before performing any maintenance procedure or inspection, stop the engine, wait five (5) minutes to allow all parts to cool.
Disconnect the spark plug wire, keeping it away from the spark plug.
Before performing any maintenance procedure or inspection, stop the engine, wait five (5) minutes to allow all parts to cool.
Disconnect the spark plug wire, keeping it away from the spark plug.
Trimmer Head
Belt Removed
Housing
Rotated Out
Transmission Pulley
Transmission
Drive Belt
Lower Engine Pulley
Upper Engine
Pulley is behind
Lower Engine
Pulley
Figure 38
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