Hydraulic filter change

[ericm979]

The maintenance schedule for my 3725 says to change the hydraulic and HST filters at 200 hours. (I'm at 230, I forgot to check the schedule).
I was going to do it yesterday but it looks like the hydraulic filter, the large one, is down below the level of the fluid in the transmission. If I change it will I lose a lot of fluid?
Or is there some sort of valve that keeps that from happening?

The next fluid change isn't until 400 hours.

 

[LouNY]

I know on my 8050 the filter removal will dump about half the fluid.
Also I know my operators manual was skimpy on details but the service manual for the 25 series shows a screen in the housing which needs to be cleaned and it's in the bottom of the housing.

 

[Asteral]

Well, yes you would lose quite a bit of fluid but that shouldn't matter all to much as your going to drain the old fluid to replace it, so i would do that first before you pull off the filters i promise it less of a mess that way haha.

 

[ericm979]

But the schedule has you changing just the transmission filter and "line oil filter" at 200 hours with the next trans oil change at 400 hours. Maybe they expect me to drain the oil and put it back in, but coming from cars and motorcycles that's something I've never done.

So should I replace the oil too, or skip the filter change until the 400 hour oil change?

and yea, at the next oil change I'll remove and clean the screen.

 

[Captain Dirty]

The maintenance schedule for my 3725 says to change the hydraulic and HST filters at 200 hours. (I'm at 230, I forgot to check the schedule).
I was going to do it yesterday but it looks like the hydraulic filter, the large one, is down below the level of the fluid in the transmission. If I change it will I lose a lot of fluid?
Or is there some sort of valve that keeps that from happening?

The next fluid change isn't until 400 hours.

I successfully used a shop vac to retain hydraulic fluid during a filter change on my Kubota. See post "ll" Kubota L45 Hydraulic Fluid Maintenance in Dec, 2019.

 

[crashz]

The HST and hydraulic filter is low on the Kubota too. I have replaced both and only lost about a quart total between the two by just quickly swapping the old for the new. Obviously put a drain pan underneath to catch the fluid. I replaced the lost fluid with new, factory SUTD2, but for your use, use the factory recommended fluid.

 

[K5lwq]

I always change fluid with filter. My logic is the filter gets full from stuff in the oil. So why put a new filter on with dirty oil? Same thing with changing oil without the filter. If the oil is dirty, how did the filter stay clean?

Just gives me peace of mind.

 

[Granthol]

When I did my 2910, same design, I lost about 3 gallons. It made one heck of a mess.

 

[s219]

Hydraulic oil does not get contaminated like engine oil, and it can go many hundreds of hours. It's a waste of time/money to change it before needed, plus that is a lot of environmental waste. Normally you can change the filters and take precautions to minimize oil loss. I put a plug in the breather vent and put the tractor on a ramp so that the filter(s) are uphill. Some people put a shop vac on the fill port. I have never lost more than about a cup of oil. I normally buy a couple quarts to have on hand and have never needed much to replace what spills out.

 

[K5lwq]

Hydraulic oil does not get contaminated like engine oil, and it can go many hundreds of hours. It's a waste of time/money to change it before needed, plus that is a lot of environmental waste. Normally you can change the filters and take precautions to minimize oil loss. I put a plug in the breather vent and put the tractor on a ramp so that the filter(s) are uphill. Some people put a shop vac on the fill port. I have never lost more than about a cup of oil. I normally buy a couple quarts to have on hand and have never needed much to replace what spills out.

Interesting. I never loose any on the ground and all of mine is recycled. Not sure I agree with the environmental waste on changing oil. :confused3: