ole guy here, sorry I failed to give the model # of my mower-- 917.276760 --
The Z shaped control lever feels like it is working when you pull it in and out. It is difficult to see the what the control lever is attached to; would it be advisable to stick the wd-40 nozzle in where the control lever exits the frame and spray the heck out of things and then work the control lever back and forth numerous times to see if this will loosen things up? ole guy
No a total waste of time.
Go to the link Mark provided and print out the transaxle diagram .
If the bypass rod seems to go in & out then good chance it is actually working.
If the mower will not drive and when you try to push it the rear wheels skid with almost no give at all the brake is jambed on.
The brake works on the layshaft so it locks the tranny drive much like the old diff locks and the same as the Park position on a modern automatic car.
Jack up the back of the mower and try to turn the rear wheels.
If one goes forward and the other goes backwards the the brake is locked on.
Pull off the right wheel and clear all the debris from around the brake lever and brake disc.
If you have been serviceing the mower properly , removing the rear wheels every second season and greasing the axle then it is a 10 minute fix.
If this vital piece of maintanance has not been done then good luck.
I have found some rusted on so badly I end up takeing the boxes out splitting them wheels attached then pressing the axles out of the wheels and some have taken better then 20 tons to shift.