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Ford 4500 Hydraulic Leak

B

Bob T.

Member
I have a 1972 Ford 4500 Backhoe that has a leak at the gasket where the strainer and the tube that is on the bottom of the hydraulic reservoir meet. The hydraulics operate very slowly and fluid is being forced out of the top of the reservoir fill up. Would a leak on the suction side cause this problem? How can I get this gasket to seal? I know I am not supposed to use any RTV on the hydraulic system. What type of fluid would you recommend? Thanks for any help!
 
Wouldn't think so. Not really up on hydraulics. But this is what I would use to seal gasket. Comes in about a 2 oz bottle too.

cvphoto86855.jpg
 
(quoted from post at 12:31:15 04/29/21) Its a cork gasket, paper would work in a bind . Screen may be clogged,
Click to expand...

I checked the screen when I replaced the pump 2 years ago and it was clean. On start up the hydraulics usually work fine, then after a couple minutes they are slow.
 
I think shauns right about the filter being part of the
problem. Plugged filter plus leak on the suction side
could account for air in the system, which would
cause expulsion of oil out the filler, not to mention
your slow hydraulics.
 
(quoted from post at 12:52:37 04/29/21)
(quoted from post at 12:31:15 04/29/21) Its a cork gasket, paper would work in a bind . Screen may be clogged,
Click to expand...

I checked the screen when I replaced the pump 2 years ago and it was clean. On start up the hydraulics usually work fine, then after a couple minutes they are slow.
Click to expand...

Bob, you say that you checked a screen. There should be a filter.
 
(quoted from post at 14:34:21 04/29/21)
(quoted from post at 12:52:37 04/29/21)
(quoted from post at 12:31:15 04/29/21) Its a cork gasket, paper would work in a bind . Screen may be clogged,
Click to expand...

I checked the screen when I replaced the pump 2 years ago and it was clean. On start up the hydraulics usually work fine, then after a couple minutes they are slow.
Click to expand...

Bob, you say that you checked a screen. There should be a filter.
Click to expand...

I replaced the filter when I replaced the pump.
 

So you pulled the screen from the bottom and cleaned it 2 tears ago and you also pulled the filter out from the top and replaced it?
The bottom suction elbow uses a simple cork gasket and shouldn't need any sealer, gasket # C5NNG879A available from NH dealer or eBay.

Since you'll have to drain the tank to replace the suction elbow gasket, I'd pull the suction screen out and clean it again, if it has much stuff in it I'd replace the filter again too.
The filter is inside a canister inside the oil tank, if the filter stops up the relief valve opens allowing fluid to bypass directly thur the center of the filter and out the bottom return into the tank.
It's nearly impossible for this design to induce air into the system.

Check the suction screen and that short rubber hose between the suction elbow and the pump, make sure it's not separating inside
 
(quoted from post at 18:58:17 04/29/21)
So you pulled the screen from the bottom and cleaned it 2 tears ago and you also pulled the filter out from the top and replaced it?
The bottom suction elbow uses a simple cork gasket and shouldn't need any sealer, gasket # C5NNG879A available from NH dealer or eBay.

Since you'll have to drain the tank to replace the suction elbow gasket, I'd pull the suction screen out and clean it again, if it has much stuff in it I'd replace the filter again too.
The filter is inside a canister inside the oil tank, if the filter stops up the relief valve opens allowing fluid to bypass directly thur the center of the filter and out the bottom return into the tank.
It's nearly impossible for this design to induce air into the system.

Check the suction screen and that short rubber hose between the suction elbow and the pump, make sure it's not separating inside
Click to expand...


That sounds like a good spot to check. I will tear in to this weekend if I get time and check the rubber hose.
 
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