The replacement procedure for this part is found on page 302 of the service manual, available here. 

LPS Brand Designjet Belts are the ONLY  Belts Made in the USA

LPS Designjet Belts are the Best in the World
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Thousands of these belts and kits have been delivered to Designjet owners and end users all over the world who used them to fix their plotters, each saving hundreds of dollars on the repair.

With average mechanical skills you can replace the belt and calibrate the printer in 1-3 hours. If you get stuck, you can call LPS Computer for technical assistance.

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FAQ
1. How difficult is it to replace the carriage belt?
If you have average mechanical skills, and the instructions are followed, most people can replace the belt and calibrate the printer without calling for technical assistance. If you have apprehensions about doing the replacement yourself, perhaps you can find another person with technical skills to help you.

2. How long will it take to replace the belt?
An experienced technician can do the work in less than an hour. Allow yourself 2 to 4 hours for the first time through. 

NASA, JPL, The Goddard Space Center, the US Navy, Army, Marines and many universities buy LPS belt kits. They trust us and you can too.