How do I change the belt on Eureka Altima 12 v

This link may help you change Eureka Altima Upright Vacuum's belt.
http://www.ehow.com/info_8608139_eureka-altima-2961avz-vacuum-maintenance.html

Here is the belt you need to replace and the manual which has instructions:

Eureka Altima Belts

Owner's Guide

Here is a link to the owners manual which has instructions and a link to the belt you need.

Eureka Altima Owner's Guide

Eureka Altima Replacement Belts

The belt is probably worn, stretched or broken that is why it is not picking up. Here is a link to the owners manual which has instructions and a link to the belt you need.

Eureka Altima Owner's Guide

Eureka Altima Replacement Belts

Here is a link to the owners manual which has instructions and a link to the belt you need.

Eureka Altima Owner's Guide

Eureka Altima Replacement Belts

Here is a link to the owners manual which has instructions and a link to the belt you need.

Eureka Altima Owner's Guide

Eureka Altima Replacement Belts

the belt is on the bottom right (looking at it from the front). the Eureka website does have the manual for download, http://www.eureka.com/service/manuals/80244.pdf

With the vacuum flattened (straightened) out, turn it over and remove the back roller cover, (2 screws) once off, the roller should just pop out on the opposite side (opposite from the belt). Don't forget to turn the roller to center the belt once you have it on.

The replacement from Eureka will work for certain, but any brand of belt that indicates it can be used on that vacuum will work.

Let me know if you have any additional questions.

Step 1: Lower handle to floor to change belt
Step 2: Remove the two screws from the top hood on the foot
Step 3: Lift hood to remove
Step 4: Lift right end of brushroll (the belt end)
Step 5: Remove and discard belt.
Step 6: Place new belt around motor shaft.
Step 7: Place new belt around brushroll pulley.
Step 8: Align left end cap with base. Push end cap securely into
place. Make sure the square on the brushroll cap is in
place
Step 9: Pull right side of brushroll to stretch belt. Secure right
end cap into base.
IMPORTANT
Step 10: Rotate brushroll by hand several full rotations to properly
position belt.
Step 11: Place hood back on cleaner. Replace and tighten
two screws.
Step 12: Return vacuum to upright position.

You probably just have a broken belt. The belt needs to be changed about every 6 months regardless. I believe yours takes a style EXT U(Extended life upright), or a regular Eureka "U" belt works fine too.