Construction and other equipment - I40 backhoe hyd hose disconnecting

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I40 backhoe hyd hose disconnecting

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=20826
Printed Date: 19 Jul 2025 at 12:06pm
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Topic: I40 backhoe hyd hose disconnecting

Posted By: pineyjd
Subject: I40 backhoe hyd hose disconnecting
Date Posted: 15 Nov 2010 at 9:33am

When backhoe is off tractor,do the hyd fed/return hose's need to be connnected to form loop for oil

Replies:

Posted By: DonBC
Date Posted: 15 Nov 2010 at 12:49pm

When I had my H3 I always connected them together as soon as I disconnected them from the hoe to simply keep them clean and free from risk of damage. I can't remember if I did this with the engine running or not.

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Jack of all trades, master of none

Posted By: Coke-in-MN
Date Posted: 15 Nov 2010 at 9:01pm

I had a diverter valve on my HD4 but also to make a loop when bby-passing the hoe control valve the hoses needed to connect.

I would say YES. but just my idea .

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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: steve(ill)
Date Posted: 15 Nov 2010 at 9:25pm

i have a CASE 530 with two hoses that jump from the control valve back to the hoe. when the hoe is off, one of the hoses makes a loop back to the valve. It must be connected after the hoe is off, prior to starting the motor. I was told the pump would stall and possibly blow up if the motor is started as the oil will dead head.

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Like them all, but love the "B"s.

Posted By: pineyjd
Date Posted: 16 Nov 2010 at 3:18am

Doe's the loop hose need to be 4000 lb or can I use a 2000lb

Posted By: steve(ill)
Date Posted: 16 Nov 2010 at 7:05am

all my hoses were RATED at 2100 psi, and have a bursts pressure of about 4000. I just bought all new hoses for the hoe and had they built at NAPA. Note that athe oil goes thru your control valve, OUT TO THE HOE, back thru the control valve to sump. IF you dont have the hoses connected back to the valve, the oil has no where to go.

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Like them all, but love the "B"s.

Posted By: pineyjd
Date Posted: 17 Nov 2010 at 9:59am

Thanks for the info,went to TSC & bought hose to connect,works fine,now on to the sanding/painting