Manuals - Service - Support - Murray Enter model number and go to troubleshooting section. Post engine manufacturer as well as all numbers from engine: example for B&S engine- model xxxxxx, type xxxx, trim or code xx.
First, mowers are designed to run full throttle no less. Running it lower makes the engine not cool effecient, cut effecient, and shortens engine life. Second if your mower is hunting or surging I would probably take carb apart and clean it. Or replace it.
That seems like it might be your problem there may not even be overheating. Your carb is probably just gummed up.
What type of fuel are you using?
Is this a 10 year old murray with a newer 6.5 hp engine?
Did the overheating happen with the "old" motor on the mower?
Just from the limited information I have from your post and not being able to be onsite to troubleshoot your mower, it sounds like something in the mower portion is causing an extra load on the motor, causing it to operate beyond spec which may be causing it to overheat. I suspect this because you mentioned overheating with your old motor as well.
Have you had your blade sharpened and rebalanced lately?
You talk about taking it apart and cleaning, it overheating and "freezing???" up, what does that mean??????
Freezing up?? What do you have to take apart and clean?
From your talk about full throttle and hurting your hands, we can all assume you have a bent blade or shaft, of a blade that is badly out of balance, but to help you, we will need clearer info.
Gas with ethanol (and a stabilizer additive), I haven't looked for ethanol free gas, but I'm sure that somewhere around here will have it.
This is a 15 year old murray with a 15 year old 6.5 hp engine. The previous machine may have also been a Murray, but it was a briggs and stratton engine with 4.5 hp (if I am remembering right). I was hoping that the larger engine would have more capacity for absorbing and dissipating heat.
I have not had the blade sharpened and rebalanced. I can give that a try and see if that helps.
If the engine has truly seized, and you have broken it free, it won't last long at all. The only way I can imagine that you haven't
had anything real violent happen yet is your running at slow speeds. If this is the case, time for a new mower.
But that takes us back to the original question, if I get a newer pushmower, will it make it through the entire yard in one go?
Seems we all are guilty of not answering your other question, myself included.
The answer you seek is yes...you will able to get your whole yard done with a new machine. However, without proper care (winter storage) you might end up with the same problems you have now.
There has been a lot of member here who have offered a lot of help to you in regards to your current issue. If I was you, I would try every one before you go out and buy a new mower.
If you have not had the blade sharpened/balanced in 15 years that could be your problem.
Does your mower vibrate a lot?
This can be a telling sign that the blade needs to be balanced/sharpened or replaced depending on its condition.
Seems we all are guilty of not answering your other question, myself included.
The answer you seek is yes...you will able to get your whole yard done with a new machine. However, without proper care (winter storage) you might end up with the same problems you have now.
There has been a lot of member here who have offered a lot of help to you in regards to your current issue. If I was you, I would try every one before you go out and buy a new mower.
No, a year without sharpening/balancing is not that critical... You have some bigger issues going on, likely a bent shaft or so.