Finish Mower : Water in gear box. :(

Drifthopper

New member

Equipment
2000 L3710 HST . 5' brush hog . 5' back blade . 5' rake , rear scoop , 3pt boom.
Apr 22, 2022
12
1
3
Western New York
Going thru and re-building the finish mower : new bearings in the hubs, new pulleys, new belt, deck welded where needed, new paint job..... etc....

I have the gear box off the deck....( the mower has been sitting today for the last 10 + years ,) Today , took the top fill plug off and flipped the gear box over to drain the oil out...

Well..... a mix of brown sludge and water came out. :(

Without taking the gear box fully apart.... What can I do to flush it out / clean it out before putting it back in service on the mower deck...?
 

Flintknapper

Member

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L2350DT
May 3, 2022
53
44
18
Deep East Texas
IF the bearings still feel good (not gritty or rough) then you could partially fill the unit with mineral spirits, hand rotate the shafts with the unit up, then on its sides....enough to dilute any residual lube/water.

Drain that, fill with new gear lube and run it a few hours (4-5) hours. Drain and fill again with new oil. Should be good to go.

IF the bearings or bevel gears feel rough or gritty then I would suspect damage to them owing to corrosion and at that point...disassembly and inspection would be in order.
 
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GreensvilleJay

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BX23-S
Apr 2, 2019
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Greensville,Ontario,Canada
I'd probably tear it apart, clean really,really good, then install new bearings and seals. sounds like you want to USE it and since you replaced the spindle bearings.... well ,why go 1/2 way ??
Sure you 'could' just fill and go, but sooner or later, you'll need to rebuild anyway.
it's on the bench now....might as well do it right.
 
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woodman55

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l6060, rtv 1100
May 15, 2022
10
1
3
canada
Going thru and re-building the finish mower : new bearings in the hubs, new pulleys, new belt, deck welded where needed, new paint job..... etc....

I have the gear box off the deck....( the mower has been sitting today for the last 10 + years ,) Today , took the top fill plug off and flipped the gear box over to drain the oil out...

Well..... a mix of brown sludge and water came out. :(

Without taking the gear box fully apart.... What can I do to flush it out / clean it out before putting it back in service on the mower deck...?
I would flush it with kerosene or something similar. Then use a high end gear oil in it.
 
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GeoHorn

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Lifetime Member

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M4700DT, LA1002FEL, Ferguson5-8B Compactor-Roller, 10KDumpTrailer, RTV-X900
May 18, 2018
3,414
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Texas
Flush it with Diesel, then fill it with grease, and go mowing. (This was the advice of the previous owner of an old Servis/Rhino shredder given to me which had rusty water in the gearbox. So that’s exactly what I did….. in 2008….and it’s still running just fine.)
 
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