Lo Boy 154 PTO problem

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sjm32157
5+ Years
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Zip Code: 16025
Tractors Owned: Cub Lo Boy 154
Massey Ferguson 35

Lo Boy 154 PTO problem

Postby sjm32157 » Sun Aug 25, 2019 7:22 pm

I've been having odd PTO problems. I will be mowing, everything working as it should, and the pto/mower spindles will start to slow down. Engine speed doesn't change, acts like the PTO unit is slipping. If I leave the PTO engaged while this is happening, the PTO assembly will get warm. I disengage the PTO, wait until the blade spindles stop, engage the PTO and it runs fine. This happens randomly every 20 or 30 minutes or operation. I practically rebuilt the unit last fall, cam bearings, ball bearings, clutch plates, spacers, wavy washers. I didn't change out the pilot/needle bearings. Could they be binding causing the intermittent drag? Nothing obvious in the PTO drive train causing problems, no noise, excess play in any of the shafts. Any suggestions appreciated. Hope it isn't the pilot bearings, they look like a bear to get out of the shaft.

Eugene
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Re: Lo Boy 154 PTO problem

Postby Eugene » Sun Aug 25, 2019 7:30 pm

Condition of the PTO belts?
I have an excuse. CRS.

sjm32157
5+ Years
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Posts: 37
Joined: Fri Apr 03, 2015 9:54 am
Zip Code: 16025
Tractors Owned: Cub Lo Boy 154
Massey Ferguson 35

Re: Lo Boy 154 PTO problem

Postby sjm32157 » Sun Aug 25, 2019 7:33 pm

Good shape, adjusted to the proper tension.

mozer71
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Re: Lo Boy 154 PTO problem

Postby mozer71 » Sun Aug 25, 2019 8:40 pm

Dang I could be so wrong-but here goes anyway. The pull lever's linkage, is sort of eccentric. There must be a proper spring. It does supply some extra pressure. It should be right but you already know that. There was a post recent, where a person had burned out the PTO clutch because she couldn't keep pulling up the lever during turns and stuff. So, if that is true, there is more than balls and springs keeping things tight during use. The spring was missing.

sjm32157
5+ Years
5+ Years
Posts: 37
Joined: Fri Apr 03, 2015 9:54 am
Zip Code: 16025
Tractors Owned: Cub Lo Boy 154
Massey Ferguson 35

Re: Lo Boy 154 PTO problem

Postby sjm32157 » Sun Aug 25, 2019 9:04 pm

The spring on my pto engagement handle is missing... :? My cam actuators snap/lock into place and remain engaged. It's almost like the clutch pack goes into a temporary bind or drag making the clutch disk pack heat up. I'm sure I've missed something somewhere in my troubleshooting.

mozer71
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Re: Lo Boy 154 PTO problem

Postby mozer71 » Mon Aug 26, 2019 12:56 am

Since it works so fine until a certain time, something is seizing or been slipping all along. I expect you know decks become clogged during use. Sometimes a person needs to back up, rev or remove a branch. If the deck isn't expelling at a good clip, it is choking. Usually the stinking belt but when all tight, the PTO clutches are going to get it. I still think a certain calibrated spring at the linkage is correct. It has to ride over the eccentric and still be a spring when engaged. Perhaps this is wrong as a seized bearing would happen during heat too.
I don't like when many things are improved and there is one link which wears all of them.

sjm32157
5+ Years
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Posts: 37
Joined: Fri Apr 03, 2015 9:54 am
Zip Code: 16025
Tractors Owned: Cub Lo Boy 154
Massey Ferguson 35

Re: Lo Boy 154 PTO problem

Postby sjm32157 » Mon Aug 26, 2019 11:45 am

When time permits I am going to pull out the PTO assembly and have another look. I am going to install a replacement spring on the PTO handle, it was there for a reason... If there isn't anything binding up, it must be temporarily losing 'grip' in the clutch pack. Intermittent problems stink, it's easier to troubleshoot stuff when it just stops working. Thanks for the help.

sjm32157
5+ Years
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Posts: 37
Joined: Fri Apr 03, 2015 9:54 am
Zip Code: 16025
Tractors Owned: Cub Lo Boy 154
Massey Ferguson 35

Re: Lo Boy 154 PTO problem

Postby sjm32157 » Sat Aug 31, 2019 6:38 pm

Finally had some time to pull the PTO unit out and give it a look. Took it apart and noticed that the rear snap ring was a little worn and moving when engaging the PTO. I replaced the snap ring and reassembled the unit. Checked the adjustment and reinstalled. The PTO still slipped. I had some extra parts from when I rebuilt the assembly last year so I added a clutch plate and disk to the unit. Put it back in the tractor and tried it out in first gear on some 8 inch high grass. Worked like a champ. I now have 5 clutch plates in my pack. So now I wonder if I got grease or oil on the clutch plates when reassembling, are my clutch disks worn more than I thought, should there have been 5 disks in the first place. This has been a real adventure. Hope it continues to work like it is now.

BigBill
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Re: Lo Boy 154 PTO problem

Postby BigBill » Sat Sep 21, 2019 8:20 pm

Adventure for sure when the PO jimmy rigged everything. I used 12” diameter clutches setups on machines we built. Simple. Anymore slippage check your belts and the scanner nut on the clutch pack there’s a measurement on the thickness to go by. Just make sure both ball bearings are good on the shift levers on the pto engagement. My pto was jumping out of engagement two bearings from hamiltonbobscubs fixed it.

I purchased a complete 154 in parts on a shelf Incase my three 154’s need them.
I'm technically misunderstood at times i guess its been this way my whole life so why should it change now.

sjm32157
5+ Years
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Posts: 37
Joined: Fri Apr 03, 2015 9:54 am
Zip Code: 16025
Tractors Owned: Cub Lo Boy 154
Massey Ferguson 35

Re: Lo Boy 154 PTO problem

Postby sjm32157 » Tue Sep 24, 2019 6:43 pm

My PTO worked fine for the first 2 or 3 years that I owned the 154 and the PTO was the original config. Everything just kinda wore out at once. I think when it was all said and done I replaced everything except the PTO shaft and needle bearings. I've mowed 3 or 4 times now since adding the extra PTO clutch plate and disk. Works great so far. I'm glad Hamilton Bob has a good supply of parts.

Zdalrymple908
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Re: Lo Boy 154 PTO problem

Postby Zdalrymple908 » Tue Feb 04, 2020 9:21 am

I have had the same problem. I’m rebuilding my PTO now but I need a good picture of the proper engagement handle setup with the spring attached. Any help would be appreciated.

Eugene
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Re: Lo Boy 154 PTO problem

Postby Eugene » Tue Feb 04, 2020 10:37 am

Zdalrymple908 wrote:I have had the same problem. I’m rebuilding my PTO now but I need a good picture of the proper engagement handle setup with the spring attached. Any help would be appreciated.
Quick Links, top left of page has down loadable manuals. Go to numbered Cubs then 154 manuals. Select service manual.

The service manuals has photos of the PTO.
I have an excuse. CRS.

Zdalrymple908
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Re: Lo Boy 154 PTO problem

Postby Zdalrymple908 » Tue Feb 04, 2020 12:04 pm

Thanks I was looking in my own service manual at home and I could not find a drawing of the handle

Eugene
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Re: Lo Boy 154 PTO problem

Postby Eugene » Tue Feb 04, 2020 2:13 pm

Zdalrymple908 wrote:Thanks I was looking in my own service manual at home and I could not find a drawing of the handle
Try the parts manual, there is a pictorial of how the lever and spring are assembled.
I have an excuse. CRS.

chevyzz8
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Re: Lo Boy 154 PTO problem

Postby chevyzz8 » Sat May 09, 2020 12:22 am

my pto is not holding anymore either.


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