Hydraulic questions for someone experienced

Hi all,

I've got a hydraulic question that I think needs an answer from someone who really knows hydraulics.

Tractor: John Deere 1010 Gas, 1961, Gear Driven hydraulic pump with dual cylinders in the quadrant

The Issue: The tractor currently uses metal lines to send the fluid from the pump, to the quadrant, through the quadrant, and back to the pump. Originally, there was supposed to be a screen inside the larger diameter return line that was used to filter out debris. My tractor does not have this, and I would like to add some sort of filter. I have tried numerous part sources and salvage yards, but nobody has this part anymore. From talking to someone familiar with the part in question, he suspects that most of them ended up disintegrating inside the line, which is why there aren't even any used ones.

So, what I'd like to do is (1) replace the existing metal lines with hydraulic hoses. I am very confident that this is feasible and can be done easily. However if I'm going to do that, I'd also like to add in a way to filter the fluid. My thought was to add in a hydraulic filter housing on the return line. The line is in an ideal position to add in a filter there. My concern with doing this is that it may reduce the flow rate in the return line. In my particular system, the return line is not high pressure, but I am still worried about it regardless. Is it safe for me to do this, or do I risk tearing up my pump?

Thank you!

From a hydraulics point of view isnt there a filter at the pump
suction?

It can be done, you just need to size up the hose so the I. d. of it is the same as the steel tube was. And size the filter base accordingly also.

(reply to post at 16:23:42 03/31/21)

Click to expand...

There is not a filter at the base of the pump.

I planned to match the inner diameter with the hoses. That's great that I can add in a filter though, thank you!

Filters are rated not as much by hose/pipe size as they are by flow rate. SIzing the filter for 1.5X the original flow rate assures the needs of the
system. By the way there are great JD parts and maintenance information on the JD site. Jim

Another factor is how fine the filter is rated for in microns. As Janicholson said, having one that is rated to catch smaller particles than you need to will give you a lower flow rate.

Never use hydraulic hoses for suction oil.. They're not made for suction , only pressure. The inner wrap of rubber
has been known to come loose in the hose and block off flow to pump.. I ran into this with Ford F-550 trucks set up
for snowplowing.. Seems that the inner rubber came loose partially blocked off suction oil . Then opened up and
blew the pump shaft seal out. Sounds strange , but actually happened on not 1 , but 2 identical trucks. INSTEAD,
use a spiral wire hose made for suction applications with band clamps on the barb fittings. Surplus Center sells
complete filter heads and spin on filters for your application.. They also sell the suction hose and barb fittings.

(quoted from post at 09:07:38 04/01/21) Never use hydraulic hoses for suction oil.. They're not made for suction , only pressure. The inner wrap of rubber
has been known to come loose in the hose and block off flow to pump.. I ran into this with Ford F-550 trucks set up
for snowplowing.. Seems that the inner rubber came loose partially blocked off suction oil . Then opened up and
blew the pump shaft seal out. Sounds strange , but actually happened on not 1 , but 2 identical trucks. INSTEAD,
use a spiral wire hose made for suction applications with band clamps on the barb fittings. Surplus Center sells
complete filter heads and spin on filters for your application.. They also sell the suction hose and barb fittings.

Click to expand...

Many, many applications use rubber for suction. maybe it needs to be specially rated.

[b:458bb8e16a] I am very confident that this is feasible and can be done easily.[/b:458bb8e16a]

I know a little more about hydraulics than the woman who does nails at the beauty salon. Meaning, I don't know much.

What I do know is that your words in bold that I've put up top have NEVER held true for anything like this that I've set out to do. I'm sure it can be done in the end. Is there some other reason besides the filter issue that you want to switch from steel lines to hoses?

Tractor has held up for 60 years.

Gerrit

Didn't know that Roy. Here I've always thought someone clamped a rubber hose on my loader return as a cheap shortcut. Never blew out so I didn't worry about it.

I personally think your over thinking the situation. The suction tube had a screen on it, by no means is this a filter. I really think a filter will reduce the flow, I would see if someone could make you a new screen.

Anyway, you have duel rockshaft? Do you have any hydraulic remotes on the tractor? A lot of 1010's did not. I ask this because the ideal of a filter is to filter the return oil that is coming from a cylinder, etc. If this tractor just has a rockshaft then the system is pretty much closed system and the only contamination that you will pick up is what ever drops in the fill tube. Use a non-degternegt oil so the condensation will stay in the sump as detergent oil will absorb the condensation and that is when a filter is needed to trap the condensation.