I am not able to find a manual for the zt48 but looking at one for ZT50 should be similar. Refer page 29 for belt replacement after download from the link provided below.
If this is not same as your model then please post the serial number of your mover in the comments field.
http://lawnandgarden.manualsonline.com/manuals/mfg/gravely/915150_zt_50.html
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