First off I need clarification.
Did you say LT100, not LGT100?
I found a picture of the LT100, and it looks to be the same model as my LT75, with a bigger engine.
The lgt system releases the deck on the front support brackets for the deck. There is a small lever on the right side front bracket.
My LT75 (should be similar to a lt100) releases the deck at the rear mower lift brackets. there is a small lever on the left side rear bracket, viewed from the rear. The levers are on the mower deck itself, not on the support linkage. Don't mistake it for the deck belt tension release.
For both , my procedure is park and level ground,
for the LT75, lower deck fully, push release lever down, push deck forward to disengage mower deck brackets., disengage deck belt tension,( lever close to mower deck latch) remove belt from front pulley, lift mower lift linkage to top and pull deck out from underneath. and some cursing is involved.
For the LGT 100. lower the deck, yada, yada, lift the lever up, and move the deck backwards or drive the tractor forwards. lift the lift linkage, disengage belt and remove the deck. and some cursing is involved.
Edited by Chopperhed, June 17, 2013 - 08:55 PM.