Well now, I may not be the smartest amateur mechanic to ever wear a bra, but I do know about jackrabbits. Turtles, I know but don't identify with as much as I do the jackrabbit.
My walk behind power drive mower is clearly marked with with the speed (clutch) arrows pointing up toward jackrabbit for fast and down for turtle and slow or disengaged. The power drive has been weak for a couple of years and adjusting the cable tightening screw up toward jackrabbit, changed nothing or made it worse.
Well, yesterday was a sunny and fairly warm day, so I mowed a couple of rounds and my sore shoulders and back just couldn't hack the extra push needed to get that big 8HP mower to go forward. The speed was slower than a three legged turtle taking a nap, so I decided time to change the belt.
I turned the mower on its side and cleaned the clutch idler wheels again. Still no improvement. I checked the cable tension adjustment and it was all the way toward jackrabbit. I came inside, got on my laptop, and brought up the manual on how to replace the belt. What? They show the arrow to tighten the clutch cable, downward toward turtle.
As I said, I am no old girl master mechanic, but I do know a thing or two about twisting a wrench. Also, I have been in West Texas and do know three or four things about jackrabbits, rattlesnakes, prickly pears, and horny toads. Apparently, the arrows pointing the direction of the need for speed, applied only to the clutch levers, not the clutch cable tightener. The separate arrows on the clutch screw clearly point up toward jackrabbit and down toward turtle.
Be that as it may, I was still pleased to find this info, although buried like Jimmy Hoffa, among fine print, confusing diagrams, and in a repair section, instead of maintenance. Whoever designed this adjustment, was dyslexic. It would have been simple to put the jackrabbit and turtle on those separate clutch adjustment arrows, just backassward. Also to repeat, the manual could have shown this under setup and maintenance. It did not!
Since yesterday was the first real warm day with no wind, I twisted that screw using a crescent wrench, since I wasn't in a mood to try and guess what size of a box end it would take, and kept going in the downward turtle direction until I felt tension building on the levers. I gave it a few more turns until it felt strong.
I fired up the mower engaged the clutch and found myself walking at a fast pace to keep up. If I was to stumble, it would have drug me unless of course, I released the clutch lever. These last two or three years of having to push to assist the drive were over although damage to my back and shoulders isn't healing as fast as I hoped. I was sorry I had taken my 3 mile rural walk earlier. I estimate, I do about 3 or more miles walking behind the mower. Needless to say, I am sore this morning, but relieved and pleased, I finally decided to consult the manual on replacing the belt, the only place it shows the direction being opposite for loosening the clutch cable screw, the first step in replacing the belt.