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post #1 of 18 Old 01-13-2018, 10:57 PM Thread Starter
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Repair manual?

Can anyone please help,
I have a 30 inch Mower deck with model 106 gearbox right angle drive, the big gear is worn badly.
I will probably end up buying a new gear set but I need to find a copy of the Gravely repair manual to set up the gearset so they have the correct Pinion gear mounting distance, Preload and Backlash.
Does anyone know or have a copy of this manual for the 106 model gearbox?
Thanks for any help.
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post #2 of 18 Old 01-14-2018, 10:49 AM
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Re: Repair manual?

There is no spec for any of that. There is no preloading. All manuals are at gravelymanuals.com

Rich

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit http://GTCOA.com
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post #3 of 18 Old 01-14-2018, 11:54 AM
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Re: Repair manual?

While there are no real specs. The bearings are adjusted in the gear housing using the lock nut above the small gear. In the swivel casting the bearings are adjusted using the lock nut holding the clutch to the horizontal shaft. Both are adjusted similar to a trailer axle. Tighten to remove all play then back off nut a bit to allow a little play. The gear lash is adjusted using shims or thicker or thinner gaskets between the swivel casting and the gear housing. You want to remove as much lash as possible while allowing the gears to turn smoothly. There is also a small seal in a metal housing within the swivel casting behind the bearing near the large gear. To remove drive the seal/housing out along with the bearing race. If you are lucky it will also drive the seal from the housing. It will usually bend or damage the seal housing but you can straighten out using some sockets or pipe ect. the CR# for the seal is 8017 if you can't save the seal housing the is a fella on Ebay that sells replacements

Todd
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post #4 of 18 Old 01-14-2018, 12:34 PM
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Re: Repair manual?

Quote:
Originally Posted by Toddnails View Post
While there are no real specs. The bearings are adjusted in the gear housing using the lock nut above the small gear. In the swivel casting the bearings are adjusted using the lock nut holding the clutch to the horizontal shaft. Both are adjusted similar to a trailer axle. Tighten to remove all play then back off nut a bit to allow a little play. The gear lash is adjusted using shims or thicker or thinner gaskets between the swivel casting and the gear housing. You want to remove as much lash as possible while allowing the gears to turn smoothly. There is also a small seal in a metal housing within the swivel casting behind the bearing near the large gear. To remove drive the seal/housing out along with the bearing race. If you are lucky it will also drive the seal from the housing. It will usually bend or damage the seal housing but you can straighten out using some sockets or pipe ect. the CR# for the seal is 8017 if you can't save the seal housing the is a fella on Ebay that sells replacements

Todd
I have nothing to add other than to say that I am so happy that Toddnails is on here - so, thank you Toddnails! You have helped me more than you can imagine.

Daryl G

1957 Gravely L
1974 Gravely C8
1973 Gravely CI
1967 Gravely C8
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post #5 of 18 Old 01-14-2018, 04:51 PM
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Re: Repair manual?

The easy way to remove the bearing cup without damaging the seal retainer is to take a welder and run a bead around the inside circumference of the cup. Let it cool and the bearing cup will fall out.

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit http://GTCOA.com
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post #6 of 18 Old 01-14-2018, 06:43 PM
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Re: Repair manual?

Richard

Yes. That is also a good method to remove the bearing race, but you still need to remove the seal from the seal housing. I consider myself quite lucky to have access to welders, pullers, presses, lathes and other implements of mass destruction, that the average owner doesn't have. But these machines were designed to be repaired by the average "Joe" without any special tools.

Todd
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post #7 of 18 Old 01-14-2018, 10:22 PM Thread Starter
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Re: Repair manual?

Thanks everyone for your help, The small driven gear on the shaft that turns the blade, the nut came loose (last year) and I took it apart and made up a collapsible spacer out of some exhaust tubing. I measured the distance between the two "Tapered Roller Bearings" and made it an 1/8 inch longer and drilled 4 holes in the middle of the tube so now the nut needs about 130 lbf.ft to begin to collapse the spacer. I tightened it like a Diff Final drive pinion bearing preload and set the running torque of the shaft to 10 lbf.in. (easy to turn by hand)
This has stopped the nut from working loose while still maintaining a small amount of running torque on the two bearings and keeping the gear tight against the shim and bearing shoulder.
I am going to take your advise and set the backlash to zero by shimming the large drive gear and swivel housing and then shim it out to approximately 0.003" to 0.004" thousands backlash and just give it a go and see what happens.
Although the gears are worn and noisy when in operation I thought if I set them to Factory Spec it would be the best place to start from.
I am using SAE 90 oil mixed with a 1/2 a measure cup of EP Grease to thicken the oil.
I have tried this previous and it cuts down the noise a little, I had the screw plug off the top of the gearbox last week after finishing mowing some thick grass and I contemplated while eating a Banana should I put the skins in the gearbox and refit the screw plug???
I had one of those "Shall I or Shan't I" moments! ! ! anyway I threw the Banana skin away and screwed the plug back on and thought no I will try Factory settings first,
as I write a pound of Banana's on the shopping list!
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post #8 of 18 Old 01-15-2018, 04:07 PM
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Re: Repair manual?

I should have also said that once the race falls out so will the seal retainer. Once the retainer is out then changing the seal is possible.

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit http://GTCOA.com
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post #9 of 18 Old 01-16-2018, 12:36 AM Thread Starter
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Re: Repair manual?

Can anyone recommend a part number for the two gears for the model 106 gearbox and where can they be purchased?
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post #10 of 18 Old 01-16-2018, 01:37 AM
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Re: Repair manual?

Call Richard's L&G and ask for Jamie. He will know the new part numbers. You can also go to their website gravelyparts.com

Code:
                              Current Inventory
   24G (Onan 24hp)    24GLX - was 16G  (Onan 24hp)   8249 - was 8129 (Onan 24hp)
        818T (Onan 18hp B48)       8163T - was 8123 (Onan CCKA) 
                              8183T (Onan B48)
   5665 w/brakes        5665        5660        Pro-8         Pro-16 w/brakes

For Gravely Manuals and more visit http://GTCOA.com
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post #11 of 18 Old 01-16-2018, 08:26 AM
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Re: Repair manual?

Quote:
Originally Posted by Roadranger #18 View Post
Can anyone recommend a part number for the two gears for the model 106 gearbox and where can they be purchased?
Roadranger #18,
I am willing to bet that those gears will not be inexpensive! What is the availability of Gravely equipment in your country? I often see complete 30" 106 decks listed on Craigslist for $100 US. As a backup plan, 106 parts can be found on Ebay but you never know what the real condition actually is (in fact, there are some there now but shipping could be prohibitively expensive).

Take a look at this: https://www.gravelymanuals.com/pdf/3...r_IPL_0173.pdf. I think that these are the two parts you need:
#21 12862P1 - Bevel Gear
#31 12850P1 - Bevel Gear

Daryl G

1957 Gravely L
1974 Gravely C8
1973 Gravely CI
1967 Gravely C8
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post #12 of 18 Old 01-16-2018, 07:35 PM
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Re: Repair manual?

Roadranger # 18

I am guessing that your rotor shaft nut is not slotted, or a castle nut. And there is no hole in the shaft for a cotter key. If that is the case a new 5/8-18 thin lock nut is needed. It is the same nut used on the clutch, and also on the drive axles. If a new one is hard to find you could use one of your axle nuts. Or squash the locking side of the nut using a big hammer or press. Or use a hammer and punch to lock it after tightening. There is no reason to use a "crush sleeve". I think you will find the gears are NLA. The only option would to find used gears or a drive assembly. If your mower does work and is only noisy, some heaver oil or a banana peel might help. It might surprise you and out live you.

Todd
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post #13 of 18 Old 01-16-2018, 09:52 PM Thread Starter
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Re: Repair manual?

Thanks Toddnails.
I used a collapsible spacer to achieve the torque on the nut so it would nut undo itself, also to guarantee that the gear was held in alignment with the two tapered roller bearings to help with tooth contact pattern under varying load.
As it turned out the retaining nut is very tight and the light bearing preload has not changed but the noise of the gears when running is a little hard on the Ears.
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post #14 of 18 Old 01-16-2018, 09:56 PM Thread Starter
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Re: Repair manual?

Toddnails.
Incidentally the cost to manufacture here in NZ is 600 US dollars and even more if I get made in Spiral Bevel, but at least it might be quieter (I hope).
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post #15 of 18 Old 01-16-2018, 10:51 PM
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Re: Repair manual?

All your bearings and races in the swivel casting and gear housing are smooth without wear and pitting right? I have had some mowers with badly worn gears, but have never heard them "sing" louder than than the tractor. Can you post photos of the gears?

Todd
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