Jean...in another method of explaining... the tailwheel rolls on an axle that needs grease. (If your wheel is rolling...that's not your problem, but grease it anyway. regularly.)
If your tailwheel turns off to one-side when you turn the tractor..and refuses to follow "in trail"... upright...then the vertical shaft (with the large washer and cotter-pin) above the tailwheel assembly is frozen in-place and needs to be un-frozen and greased. IF you leave your mower outside in the rain...it will do that regularly. (Take an old plastic coffee-container and store the mower with the coffee container installed upside-down on that vertical shaft.)
To free that vertical shaft can be a "bear". Spray some WD40 etc and let it soak. Then use a long pipe, crow-bar, pry-bar, etc, sticking thru the tailwheel assembly above the tire, between the two arms that hold each end of the axle, and that should give you enough leverage to twist that tailwheel left/right to get it back "in trail". Now that it's freed.... grease that vertical shaft thru it's grease fitting (zerk). Keep it greased. Keep that coffee can over it during storage.
Jean... these mowers are really dangerous. Stay AWAY from that PTO and driveshaft when its turning. Keep in mind that anything (hat, cell phone, etc.) that you drop or falls while mowing WILL be run-over and chewed up by that mower....this includes YOU if you lean way over to duck under a tree and/or otherwise fall off. DON"T let kids or inexperienced people operate it. DON"T mow sideways on steep slopes to avoid roll-over.
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