Mowing Large Mower Maintenance

   / Large Mower Maintenance #1  

woodlandfarms

Super Member
Joined
Jul 31, 2006
Messages
6,137
Location
Los Angeles / SW Washington
Tractor
PowerTrac 1850, Kubota RTV x900
So, I was surfing and came across some notes about a MMMower and that the person relaxes tension on the belts over the winter.

I did not do this over this winter. Did not know this was something to do. Is it?

Carl
 
   / Large Mower Maintenance #2  
I've never done it. Ours is 8 years old. I'm on my second belt because the first one broke. Hmmm..... :p
 
   / Large Mower Maintenance #3  
For what it is worth, Terry said the most important thing to do on my brush mower was to make sure to grease it every day before using it, using a high speed, high temperature grease. I mentioned that I believed I had read here that the bearings were sealed and that greasing too much ruined them. He said grease each time. Terry usually gives me very good advice. He and this forum are why i bought a PT.

Ken
 
   / Large Mower Maintenance #4  
I completely agree about this forum and Terry being the reaons why I was willing to buy a PT. I agree about Terry's advice being generally very good, but the mower and greasing was the one time that he steered me wrong.
The greasing applies to the finish and rough cut mowers. It doesn't apply to the brush cutter.

Short story:
As a new PT owner, I bought the high speed, high temperature grease on Terry's say so. I then went out to my brand new brush cutter before I went out and used it. For the life of me, I couldn't find a high speed grease point, so I called Terry, figuring that I had missed something, perhaps like the hidden articulation zerk.

The call was along the lines of "shoot, I thought you had the mower. There ain't a grease point on the brush cutter."

So I now have a nice new grease gun fully loaded with high speed, high temperature grease. Talk about a solution looking for a problem...

All the best,

Peter

P.S. I found the whole thing humorous, and consistent with PT. And yes it didn't erode my faith in Terry. I do trust him for great advice, as I trust the members here as well! Just seeing the grease gun on the wall makes me smile.

P.P.S. The idea behind loosening the tension in a v-belt is to not overload the bearings. Given how fast the belts get hot, I doubt that it is worth doing, since the a minute or two after you have spun the mower up, that v-belt is going to be warm, and looser. Who mows lawns when it is below 32F? It is not as if this were a blower used to blow grass in July and snow in January, where you might expect it to stay hot and to stay cold during use.
 
   / Large Mower Maintenance #5  
...
Who mows lawns when it is below 32F? It is not as if this were a blower used to blow grass in July and snow in January, where you might expect it to stay hot and to stay cold during use.

No grass but plenty of leaves below those temps. ;)
 
   / Large Mower Maintenance #6  
I stand corrected...that ought to teach me about shooting my mouth off.

SO... Do you warm up your mower, or just go for it?

All the best,

Peter

No grass but plenty of leaves below those temps. ;)
 
   / Large Mower Maintenance #7  
For what it is worth, Terry said the most important thing to do on my brush mower was to make sure to grease it every day before using it, using a high speed, high temperature grease. I mentioned that I believed I had read here that the bearings were sealed and that greasing too much ruined them. He said grease each time. Terry usually gives me very good advice. He and this forum are why i bought a PT.

Ken

Terry is just full of bull on that theory. Sealed bearings are just that, once you break the seal, { not a real seal }, it will let in water, rust particles, etc. Now if he has modified the sealed bearings by removing the inner seal, then pushing in some grease every now and then would be OK. Most likely you are pushing grease by the outside of the bearing and that is what you see and think it is OK. Add to much and it just slings it off. Adding grease also helps keep out water. Too much is not a good thing either, there has been a lot written about that, just enough is right. That greasing every day is just plain crap, unless you have a 1/4 in play in the bearings and race of the bearings.

As far as the belts, there is some logic to relaxing the tension on the belt, or just taking it off and not curl it. It should be fully open. The logic is that the belt if under tension, will tend to set and harden over time, and when next used, might come off the pulleys. I had a Craftsman with a Kohler engine, and every time I first started it up, off came the belt. If you were to take of that belt and lay it down, it would try and curl in the shape of the pulley belt path on the mower. I don't relax the tension on anything, and that was the only machine that threw the belt consistently.
 
   / Large Mower Maintenance #8  
OK,

Just a few impressions and comments here (FWIW).

I've spent some time on several occasions talking to Terry, both on the phone and in person. I think he's a good guy who tries to balance his loyalties to his employer with giving his best advice to his customers. There are times when I disagree with his advice, but those instances are a matter of opinion and interpretation. I trust Terry to try to help me keep my PT working well.

On the subject of lubricating mower bearings, we're getting into a can of worms. Yes, PT uses sealed bearings. No, sealed bearings aren't supposed to need lubrication...

However - based on my observations of my 60" finish mower, it ain't that simple.

Those sealed bearings are designed to hold up well when installed with the proper endplay and/or preload. PT's manufacturing tolerances aren't extremely precise. The tolerance stackup on the blade quill spindles and housings seems to run outside of the bearing tolerances.

That's where the grease comes in. If things are a little tight, some extra grease might provide a little extra lubrication under the higher bearing loads. If things are a little loose, the extra grease might help keep thigs from rattling themselves apart too soon.

Is that really good engineering? Nope. Is that the way the big boys (like Cat or Bobcat or Komatsu) would do it? Nope. Does PT provide useful manuals like the big boys do? Nope. Does a PT cost what a Cat or Bobcat or Komatsu costs?

NOPE!

I don't know about you guys, but I bought a PT because it does a "good enough" job for the money. There are some other machines that do some things better, and some that do a few things a lot better - but they all cost a LOT more. A lot of that commercial/industrial/professional stuff seems to cost 3 - 10 times as much.

If I were using it full-out on a daily basis to make my living, that might be worth considering. Here's a parable for you:

When I was a full-time auto mechanic, some Snap-On tools made some sense - I used them REALLY HARD every day under conditions that would have bent or broken Craftsman tools, much less Harbor Freight tools. I was working hard and fast. Lesser tools would have cost me productivity and possibly injuries.

I'm not turning wrenches for a living anymore. It's really not a big deal if it takes me 10% longer to remove a shock absorber. I don't need to put a 3 foot cheater pipe on a 1/2" breaker bar in order to beat flat rate.

When I was doing that stuff for a living, I needed Snap-On. It was maybe 10-50% better at 300-1000% more cost, but I HAD to have that 10-50%.

Nowadays, I don't need Snap-On. I also don't need Cat, Bobcat, or Komatsu.

PT provides a tool that lets me do what I need to do. It's got plenty of flaws and weak points, but it's still good enough to get the job done. Everything else that can do the job costs so much that I can't afford it. If I can't afford it, it won't get the job done.

I've had my PT for about 4 years now. I've learned a lot since then. I've dealt with some disappointing problems. I've seen some cool new machines appear on the market. I haven't seen anything else that would do the same jobs for anywhere near the price. I'd buy one again.

Gravy
 
   / Large Mower Maintenance #9  
OK,

PT provides a tool that lets me do what I need to do. It's got plenty of flaws and weak points, but it's still good enough to get the job done. Everything else that can do the job costs so much that I can't afford it. If I can't afford it, it won't get the job done.

I've had my PT for about 4 years now. I've learned a lot since then. I've dealt with some disappointing problems. I've seen some cool new machines appear on the market. I haven't seen anything else that would do the same jobs for anywhere near the price. I'd buy one again.

Gravy

Bravo! Very well said...

I'll state it slightly differently -- I wouldn't trade my PT and its set of attachments for ANY new Kubota, John Deere, or New Holland to use to meet my specific needs...

They'd put about 1/2 my lot off-limits -- as did the little Kubota I originally sold to buy my PT -- doing a lot of manual labor that I have neither the time nor energy for...

Now if there were an Avant or Multi-One dealer nearby, with a stock of parts and a service department AND MOST IMPORTANTLY a machine I could afford, maybe that would be a different story....

As of today, if were to sell my PT it would be only to buy another one...
 
   / Large Mower Maintenance #10  
I stand corrected...that ought to teach me about shooting my mouth off.

SO... Do you warm up your mower, or just go for it?

All the best,

Peter

When it is cold out, I start the tractor and warm up the hydraulics until the lift arms move freely. Then off I go. Before I start the mower or brush hog, I throttle back to almost idle, engage the PTO switch and watch the deck spin up. Once it is spinning, I go full throttle and start mowing.
 

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