About gear box Peerles-HMST-206-565

Bange

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I always try to anticipate some problems ...
I am seeing information and videos about the gearbox (mine works well), it is bathed in thick oil, but has no drain or opening for changes.
It seems to have a sturdy construction and a long life forecast, but not infinite ...
Is there any guidance for changing the oil?
At what age?
 

Rivets

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The “thick oil” you are seeing is actually Bentinite grease, which is a clay based grease used in many on the Peerless models. If you decide that you “MUST” change the lubricant in you tranny, be ready for a sticky, dirty job. Do not attempt this unless you have above average mechanical skills and a minimum time frame of one week. I know this time frame sounds odd, but if you decide to open the tranny, it will take 1 day to open unit, disassemble and clean all parts. Bentinite grease will get into everything. Then you should inspect the shift keys, bearings/bushings, gears as seals to see about replacing as needed. Most shops don’t have in stock, so will need to order. After you receive the needed parts, plus a tube of grease, most of the time It takes me about three hours to assemble it properly, I triple check everything, don’t want to open it a second time. I’ve done this many times in the last 50 years and really don’t mind doing it, but it dos take time and patience.
 

Bange

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Strange you talk about grease ... I saw this video and the lubricant is thick oil ...


Looking on the net, a few minutes ago I found a Tecomseh material (the site refused to attach it, as it is very large), where I have my Peerless MST series, and in fact the lubricant is oil ... and there is also a plug for supervision and exchange of oil ... but nothing says about changing the period and this is my question.
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Mechanical execution is no problem ... I have a lot of tools, but not a compressed air one ...
 

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bertsmobile1

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The reason why there is no provision for changing the lubricant is because it is not designed to be replaced.
The actual consistency of the lubricant is very important for the proper operation of the transmission as holes for the lubricant to circulate around gears & bushes are sized for the lubricant used .
Unless you have identified a problem, like leaks from a seal, leave them alone.
Providied you do not shift whie moving which damages the keys and gears that box will do 10,000 hours , about 5 times of the life of the engine .
 

Bange

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I totally agree, but he is an 11-year-old cutter, I am the third or fourth owner, he doesn't have an hour meter and I don't know under what conditions he has been kept (see my post on engine noise).
As the gearbox is working well, my intention is just to change the oil and make sure it is clean and at the correct level.
Just like buying a used car, it is normal to change all fluids, inspect brakes, shock absorbers, headlights ... then just follow the preventive maintenance chart ...
I was satisfied and calmer when I discovered that there is a way to drain, inspect or change the oil, because until then I only saw information that I was only opening to change.
 

Rivets

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Are you sure you have an MST tranny and not an 800 or 900 series tranny? What is the number on the ID tag on the tranny? Yes, you are correct that an MST tranny uses 80W90 gear lube, but the 800 and 900 series units use Bentinite. You say you have an MST unit, but the video your watch is not an MST if it has Bentinite in it. The ID tag will tell us which you have. Your analogy of buying a used car vs a used tractor is only half correct. We are talking about a multi $1000 unit vs a multi $100 unit. Having torn down and repaired both types of mower trannies I can tell you there is no reason to open up a unit unless I’m over 80% sure that there is something wrong inside. If you do open it up, I’m will to bet big money that you will have to replace the seals or it will leak after reassembled. If the tranny is working well I strongly recommend not doing anything with it, but it is your call. Only my opinion which many techs on this site say ain’t worth a dime. If you do open it up there is a good procedure manual available.
 

bertsmobile1

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Double of what Rivers says
These units are tough and EXPENSIVE which is one reason why they are not used much.
They will outlast everything on the mower by a long way and require next to no work.
If you do open it up, you should replace all of the bushes & seals , check the shift keys for cracking, I replace them as a matter of course, less than $ 20 but $ 100 in time to do it again.
Very dirty job.
I mechanically remove as much as possible with a pallet knife , kitchen spatchler & finally kerrosene towels
The a soak in kerro for a day or so followed by a high pressure water jet wash.
Internals like gears get a solvent soak, pressure wash then ultrasound using kerro as the solution
Similarly to working on a hydro, clean parts need to be kept in closed bags till you are ready to assemble.
Do this on a damp towel and keep another damp towel handy to cover over the job if you ave to walk away.
Make sure all shafts that get seals on them are polished shinny before assembly .
 

Bange

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No, my friends, my intention was never to open ... just to get to know and change the oil in case I was overdue for time.
But since there is a way to inspect and replace it, I will change it, but as a precaution.
Yes, I'm sure it's a Peerles MST ...
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Bange

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It was too good to be true ...
Before removing the unit I already checked that it did not have the drain point, even so I did.
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Small things, but important to fix soon ...
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Belt and pulley dragging
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Brake pad, tomorrow I will remove and check
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Bange

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Well, I could only see the brake today ...
The removal of the disc had to be somewhat aggressive due to rust, now it goes in and out manually. I don't know the thickness of the inserts, but the internal one shows a degree of wear ... does anyone know how to inform?
If they are still reasonable, can I put a plate of the same size to make the tablet higher?

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Right-hand insert is always internal
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Can I consider the largest measurement to be the thickness of a new one?
 
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