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post #1 of 7 Old 08-13-2019, 11:12 AM Thread Starter
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Checking hydraulic pressure - "How to" and what gauge/setup to get

Working on a 455

Having never done this before, I'm looking for some high-level info.

What kind of gauge/setup is best to get?

How and where do I check it? If it's just plugging it into a coupler - which one?


When I'm doing the shimming I'll have the seat pan off and diesel tank moved out of the way. Can i start the tractor and check pressure without reassembling everything?

JD 445 ~2001 w/ 60" deck. JD 3pt Hitch (SOLD)
1200hrs

JD 455 ~1998 w/ Rear PTO and 60" deck, and 47 blower. Ruegg Cat1 3pt Hitch. 40 Loader w/ loaded Duros
1700hrs

JD 455 - 1993 (1st year) w/ 60" deck.
1100hrs
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post #2 of 7 Old 08-13-2019, 11:55 AM
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Re: Checking hydraulic pressure - "How to" and what gauge/setup to get

Ken's Bolt On Grab Hooks makes a nice gauge that you can plug right in to one of your quick couplers.

Go to this link and scroll part way down the page.

Ken's Bolt on Grab Hooks <<Hydraulics>>
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post #3 of 7 Old 08-13-2019, 03:13 PM
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Re: Checking hydraulic pressure - "How to" and what gauge/setup to get

I bought this gauge along with a short hose and coupler from SurplusCenter and then a quick-attach fitting from the dealer. If it wouldn't have been for shipping costs the total outlay would have been about $30. Any similar gauge would work. Make sure the hose is long enough so you can hold it while operating your hydraulics, or at least position the gauge to be visible.

https://www.surpluscenter.com/Air-Pn...-21-1246-K.axd

As far as checking, normally you just plug it into one of your tractor's hydraulic circuits and then operate the control (i.e. your loader lift) and watch the peak pressure during active engagement. When done, shut off the tractor and cycle hyd circuit to relieve static pressure, then disconnect gauge.

If your tractor doesn't have quick-attach hyd circuits then things will be more complicated.

Rob

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post #4 of 7 Old 08-15-2019, 03:46 PM Thread Starter
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Re: Checking hydraulic pressure - "How to" and what gauge/setup to get

Thanks for the info!

Does anyone know the answer to the following:

When I'm doing the shimming I'll have the seat pan off and diesel tank moved out of the way. Can i start the tractor and check pressure without reassembling everything?

JD 445 ~2001 w/ 60" deck. JD 3pt Hitch (SOLD)
1200hrs

JD 455 ~1998 w/ Rear PTO and 60" deck, and 47 blower. Ruegg Cat1 3pt Hitch. 40 Loader w/ loaded Duros
1700hrs

JD 455 - 1993 (1st year) w/ 60" deck.
1100hrs
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post #5 of 7 Old 08-15-2019, 05:00 PM
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Re: Checking hydraulic pressure - "How to" and what gauge/setup to get

Quote:
Originally Posted by MISparty View Post
Thanks for the info!

Does anyone know the answer to the following:

When I'm doing the shimming I'll have the seat pan off and diesel tank moved out of the way. Can i start the tractor and check pressure without reassembling everything?
You will be fine cleaning everything. Make sure to do it before removing the old valve. This way you lessen the chance of introducing contaminants into the system.

07 John Deere X748
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post #6 of 7 Old 08-15-2019, 09:30 PM
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Re: Checking hydraulic pressure - "How to" and what gauge/setup to get

Just be certain to get a fluid filled (dampened) pressure gauge. Otherwise, you will go crazy watching the needle bounce around.
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post #7 of 7 Old 08-15-2019, 11:44 PM
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Re: Checking hydraulic pressure - "How to" and what gauge/setup to get

Quote:
Originally Posted by MISparty View Post
Thanks for the info!

Does anyone know the answer to the following:

When I'm doing the shimming I'll have the seat pan off and diesel tank moved out of the way. Can i start the tractor and check pressure without reassembling everything?
Yes, you can easily drop the fuel tank back down and fire it up. No need to have the seat pan installed to start the tractor.

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