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#3113110 - 09/02/13 10:07 PM What oil for a gear box with a wet clutch?
BruceL Offline


Registered: 09/02/13
Posts: 1
Loc: Wisconsin
Picked up a trailer mounted post hole digger. It has a Briggs motor that couples to the auger through a "wet" centrifugal clutch and a gear box. Nice design that allows for leveling and safe operation. I can't find any online info about it. I want to know what oil to put in the gear case that will allow the clutch to work properly. The machine is similar to this online image: Dig-R-Mobile post hole digger

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#3113138 - 09/02/13 10:54 PM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
Brybo86 Offline


Registered: 10/08/11
Posts: 2052
Loc: Chicago, IL
rotella would be my choice
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08 Honda Accord EX-L 2.4L RP 0w20 116k
01 Kymco People 50
95 Lexus LS400 M1 AFE 0w30 178k
95 Yamaha Jog
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#3113157 - 09/03/13 12:03 AM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
Bandito440 Online   content


Registered: 02/13/12
Posts: 3179
Loc: NYS
Rotella is great, or a motorcycle-specific oil that's designed specifically for wet clutches.
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'14 Grand Cherokee EcoDiesel
Pennzoil Euro L & OEM filter

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#3115405 - 09/05/13 06:17 AM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
Shannow Offline


Registered: 12/12/02
Posts: 33510
Loc: Oz
Mobil AGri 424 is an 80W gear oil with wet clutch capabilities

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#3116685 - 09/06/13 12:03 PM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
camelCase Offline


Registered: 07/11/13
Posts: 170
Loc: Southeastern, USA
Any synthetic automatic transmission fluid around 90wt would work just fine for you. That wet clutch is going to shear the fluid up a bit - but it shouldn't have too large of a charge, so changes shouldn't break the bank.

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#3123016 - 09/12/13 07:59 PM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
RDMgr Offline


Registered: 11/02/09
Posts: 6
Loc: USA
Why not use a TO-4 fluid. It's a gear and bearing oil with frictional compound compatibility. SAE 50 or 60 should work.

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#3133147 - 09/23/13 08:02 AM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
camelCase Offline


Registered: 07/11/13
Posts: 170
Loc: Southeastern, USA
Whichever you use, you will have to change it pretty consistently because that wet clutch is going to shear that oil down to a lower viscosity the more it is used.

Since it's just a gear box and not oil for that little motor, I'm get a high quality ATF fluid or similar and just go with it.

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#3273123 - 02/06/14 09:44 PM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
Pistol_Pete Offline


Registered: 06/02/09
Posts: 30
Loc: Wisconsin, United States
The type of gearbox would be very helpful...like what kind of reduction? worm gear? I would start there and use a gear oil specific to the type of gearbox and then make sure it has a anti-friction modifiers for the wet clutch. You need more info to decide on proper recommendations.

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#3296183 - 02/27/14 12:00 PM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
drolds Offline


Registered: 02/04/14
Posts: 75
Loc: KS, USA
Use a motorcycle oil w/o friction modifiers in 10W-30.

Dr. Olds

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#3296228 - 02/27/14 12:29 PM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
Clevy Offline


Registered: 11/11/10
Posts: 9782
Loc: Saskatoon canada
Rotella conventional 15w-40.
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#3311420 - 03/14/14 07:25 AM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
supercity Offline


Registered: 06/12/12
Posts: 1030
Loc: Australia
Castrol Agri Trans Plus 80w

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#3335008 - 04/06/14 02:00 PM Re: What oil for a gear box with a wet clutch? [Re: BruceL]
ac_tc Offline


Registered: 05/06/08
Posts: 597
Loc: sweden
Universal tractor fluid.
STOU / UTTO.
Ask at the nearest farm shop.
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-98 Dodge Durango 5.9 4*4 HDEO 10w- 40 ci4
-04 PT Cruser GT 10w- 40 HDEO ci4
-Everything else HDEO 10w- 40 ci4/STOU 10w-30/THF

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