Yes, definitely replace it. There are several threads on this subject. It is item#38 below.

38

JD5801

Pressure Relief Fitting

1

PART DETAILS Part Number: JD5801 Part Price: 1.83 USD Each On Hand: 3 Check Other Stores Description: Pressure Relief Fitting - VALVE, RELIEF-ALEMITE 131000 Package Quantity:

 

What do you think may have done this, I’m sure it must have to do with putting the deck on, last time I did with loader still on wondering if that had to do with it


JD 1023-E 2017 H-120 Loader, 54” AC MMD, Ballast Box, 47” JD Snowblower w/Quick Hitch & Remote Control Chute Flap, OT Cab w/Glass Windshield, Wiper, Heater, Armrest added, Front Led Lights, JD IMatch QH, Rear Hitch Receiver, Rear 3-pt Blade
Interest: Woodworking-Tractors-Chris-Craft Boats.
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Replace it and get the gearbox oil changed. Water in the oil probably isn't an issue since the cap is still there but I ruined a gearbox because the cap came off and water got in.


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I just replaced the same vent. A new one from the dealer was a whopping $1.88. It’s listed as a Pressure Relief Valve, part # JD5801

****The pic on the post above didn’t load before I posted this***

 

This pass June I paid $1.83 for mine. Same part #. Saved $.05 till I paid for my gas to get it.

 

Wow! This is all new to me. Il have to check my cap now... Heck i didn’t know it had fluid in a gearbox that even needed to be changed?
Thanks!



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Wow! This is all new to me. Il have to check my cap now... Heck i didn’t know it had fluid in a gearbox that even needed to be changed?
Thanks!

No offense but your Owner's Manual is your friend. Many times a quick read-through can help to avoid costly equipment damage.

 

Got it! Thanks!!


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Yup, I did it to my pressure relief fitting too, only the whole metal cap was missing with what I assume was some sort of sealing plunger and spring.

I know exactly what happened. I dropped off my virgin MMM in the grass, and when I came back to re-install it, the FEL stand snagged it on the way up the MMM deck and popped the cap off. Of course, by the time I realized it was missing, it was a day later and the pieces were nowhere to be found.

Just installed the new fitting today. Guess I should check the oil level in the MMM gearbox before I use it, because I can't remember if I tipped the deck up on its back edge far enough for any to leak out when I removed the mulch kit. Without the cap on the fitting, it was an open hole down into the gearbox.

I had to use a couple pieces of 15" long 2x8 board to make "ramps" up the rear of the deck to lift the front of the tractor up sooner than normal to get the loader stand to clear the fitting, so I could connect the MMM up again with the loader on.

So, from now on, if my loader is on the tractor, I will be using the two boards when installing or uninstalling the MMM.

Gotta love the learning curve for a new piece of equipment. Luckily, it was only a $1.83 lesson!

 

Most likely that the loader parking stand contacted the vent during mmm removal/ install. Make sure there is no load in the bucket when driving over deck, also double check all of the tractor tire pressures, a slightly low tire can cause concerns. Even if everything is right the parking stand is oh so close during mmm install/remove.