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post #1 of 9 Old 04-30-2019, 03:26 PM Thread Starter
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MTD 990 Hydraulic Lift Questions

Anyone know where I can get replacement seals for the lift cylinder on my MTD 990?

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post #2 of 9 Old 04-30-2019, 03:47 PM
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Re: MTD 990 Hydraulic Lift Questions

Following, as I may need some too.

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post #3 of 9 Old 05-01-2019, 08:10 AM
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Re: MTD 990 Hydraulic Lift Questions

I got mine at Ace Hardware in the plumbing section. The o-ring selection is quite good.

Chuck L

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Implements: Restored Sears FEL not mounted yet, Haban 42" snow blower, 3-PT Carry All, 3-PT Winch Boom, 50" Mower Deck, 50" Rear Blade, 2 - 54" Front Blades, 4500w Generator, MTD 990 Rear Tiller.
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post #4 of 9 Old 05-01-2019, 11:16 PM
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Re: MTD 990 Hydraulic Lift Questions

Any hydraulics shop, many hardware stores, and auto parts stores if you have the old rings in hand and need replacements in a hurry.

If you know the size, there are charts for O-ring part numbers on the net and you can order from several places such as Messicks, if you aren't on a hurry.

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post #5 of 9 Old 05-19-2019, 01:19 PM Thread Starter
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Re: MTD 990 Hydraulic Lift Questions

Managed to figure the sizes out myself. ID: 1 1/2, OD: 1 7/8, Section: 1/8.

I replaced them all and the seals no longer leak, but now it's leaking from where the ram goes into the cylinder. From what I understand there is no way to fix that, can someone confirm that? Thanks

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post #6 of 9 Old 05-19-2019, 02:19 PM
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Re: MTD 990 Hydraulic Lift Questions

That is also fixable. The gland (round piece of steel that the rod goes through) has a seal on the inside bore for the rod as well as one on the outer diameter that bears against the cylinder tube.

Depending on the rod design, you may have to remove the piston from the rod. Check the inner bore of the piston for another seal that is sometimes hidden there.

Note that there is also a dust seal (otherwise known as a grease or oil seal in the automotive world) around the rod that is usually visible from the outside. That seal is a different animal altogether. It will not seal against pressure inside the cylinder. It's there to keep dust and dirt out of the cylinder.

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post #7 of 9 Old 05-19-2019, 02:27 PM
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Re: MTD 990 Hydraulic Lift Questions

You can remove the piston or the clevis. There is an o-ring inside the hole for the shaft.
Heat may be needed to soften the Loctite on the threads. Gripping the piston and shaft without damaging is the tricky part. Hopefully the clevis end has not been welded to the shaft and will unscrew. The cylinder shaft breaks at the threaded clevis end.

Chuck L

3 Late Model MTD 990s - (2 1980 Farm Kings and 1981 Wizard), 1978 Farm King, 1973 Farm King, 1973 Farm King for parts. Craftsman DTY4000, DLT2000.
Implements: Restored Sears FEL not mounted yet, Haban 42" snow blower, 3-PT Carry All, 3-PT Winch Boom, 50" Mower Deck, 50" Rear Blade, 2 - 54" Front Blades, 4500w Generator, MTD 990 Rear Tiller.
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Last edited by VTXRider; 05-19-2019 at 02:32 PM.
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post #8 of 9 Old 05-19-2019, 02:43 PM Thread Starter
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Re: MTD 990 Hydraulic Lift Questions

Thank you very much! I just went and tore it apart again and it is not welded on. I have it sitting with the piston face down with liquid wrench sitting in the threads, because it's pretty rusty. I'll let it sit like that for a few hours, then if it's not freed up a bit I'll try some heat. Thanks!

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post #9 of 9 Old 05-23-2019, 06:55 PM
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Re: MTD 990 Hydraulic Lift Questions

The O rings are (#114) 13/16 od x 5/8 id x 1/8 for the rod. (#222) 1 3/4 od x 1 1/2 id x 1/8 for piston and end cap 3 req'd Some places carry the O rings by number.
I hope this helps
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