The blade sits on an actuating assembly that is operated by a cable from a front pedal or by direct linkage on a hand lever.
The bowl separates from base via screws under top lip of base.
To repair you will need several replacement parts
Bowl to base seal
Bowl/blade seal
Foot pedal cable/maybe foot pedal depends on where it has broken
OR hand lever assembly
Possible new actuating assembly
Blade seal
Blade if bad
Blade track
Throw in a new water valve and vacuum breaker
Here is a link to installation & owners manual.....
CLICKYSO might as well replace that old 1994 model with a new toilet.
Conversion Chart......
LINK
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31