remove deck...remove pto clutch and both idler pulleys and u should be able to put on
Cannot attach pictures here, but it seems pretty much the same as the GX85 so follow the link below.
Disingage the mower deck take off the mower deck look under neath their and replace the belt
You might check this link to the JD service manual for this model: http://manuals.deere.com/cceomview/OMGX22621_L6/Output/Index.html Good Luck, "escapetotheozarks.com
belt came of on john deere 155c ned diogram or manul to put back