Honda 216 VKA

my honda keeps getting stuck in gear. Have adjusted and replaced cable on smart drive. Have cleaned rachet drive.
Put new return spring on gear box. nothing helps. If I tap on gear box the wheels unlock and it starts working again

Is this your model number?http://www.hondapartsnation.com/oemparts/a/hpe/505ce4caf870022d24bdc9ac/transmission-1

Yes it is

The HRR216VKA has been built with two types of transmissions, both are belt-drive off the crankshaft.

Early models have a constant-tension belt; is should not be loose. Moving the lever operates a clutch device INSIDE the transmission.

Later models have a variable-tension "slip" belt. Moving the lever tightens/loosens the belt, making the transmission input pulley turn faster/slower. The belt on these models should be loose when the control is release.

What is the full serial number on the back of the mower's deck?