International 434 tractor

If you are not sure about changing hydraulic hoses the Safest thing you can do is pay a professional to do it for you. DON'T mess with hydraulics if you don't know what your doing. Hydraulics use massive PSI pressure levels, any where from 2000 PSI upwards. As a comparison a car tyre is commonly at around 30 psi.
The hoses have to be designed for high pressure hydraulic systems so you will need to only buy the correct hose for that setup.

The Ford 1710 Internal Hydraulic Filter is located behind the loader bracket near the transmission.

There is a lot of information here.

https://www.tractorbynet.com/forums/threads/jd-6200-brakes-not-working-after-hydraulic-line-broke.430574/

https://www.google.com/search?q=JD+6200+tractor+bleed+brakes

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low oil or wore out

Had a 74 ford tractor and hydraulic reservoir was under hood in engine compartment.

hydraulic oil suitable for the tractor
contact a service dealer for the exact type and viscosity

Ford Tractor Hydraulic System - My Ford Tractors

www.myfordtractors.com/hydraulics.shtml

All N-Series Tractors - Ford-Ferguson 9N, 2N, and Ford 8N ... 6 - How long has it been since you changed the hydraulic fluid? ... If that didn't do it, read on. ... then remove the bottom bolt from the inspection plate that has the hydraulic dip-stick.

Yesterday's Tractors - Fifty Tips for Ford 9N, 2N and 8N ...

www.yesterdaystractors.com/articles/artint268.htm

I'd like to say that the reason I have an 8N Ford tractor is because that's the tractor ... The N tractors have a common sump for the rear end, hydraulic pump andtransmission. ... (Read the label.) .... Take the inspection plate with the dipstick off.

Ford 8N, 9N, 2N, NAA Tractors Information - SSB Tractor ...

www.ssbtractor.com/wwwboard/messages15/

Helpful information and resources on Ford 8N, 9N, 2N, NAA tractors from SSB Tractor, a leading provider of tractor parts, manuals, implements ... 1944 ford 2n: What type of oil to use? and whats the oil pressure should be? ...... N Series Trans/Hydro Fluid - Interesting To Read ... Ford NAA/Jubilee Hydraulic dipstick location?

Ford Tractors Information - SSB Tractor Forum

www.ssbtractor.com/wwwboard/messages4/
Helpful information and resources on Ford tractors from SSB Tractor, a leading provider of tractor ... tractor pumps oil but won't pump hydraulic fluid ..... 1972 Ford LGT165 lawn and garden tractor hydraulics ..... Ford 5000 transmission oil level

Check your fluid level and type. Also make sure your hydraulic cooler core is clean near your radiator.

Engine or hydraulic system overheating Coolant system low on coolant in 6020, 6030, 6030 Premium, 7020, 7030 and
7030 Premium Series Tractors.

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Symptoms
After several hours of work, warning system indicates hot engine coolant or hot hydraulic oil.
Situation or Problem
Coolant level in reservoir is between the "MIN" and "MAX" range but engine or hydraulic system is overheating.
Summary
Air is entering cooling system, hindering coolant flow. Check coolant level. Fill to the "MAX" line on the coolant reservoir.
Bleeding Cooling System:
The bleed valve (see Operator's Manual for location) on the radiator must be closed when the tractor is operating. Open the valve when coolant is drained or filled. If the bleed valve is left open, coolant will internally bypass between the low temperature circuit and engine high temperature circuit causing overheating. When bleeding the system, open the bleed valve and run the engine with no load for 5 minutes at 1700 rpm. Then shut engine off for 5 to 10 minutes before closing the drain valve. Check the coolant level. If level is below the "MAX" fill line, repeat this procedure until coolant level stays at the "MAX" line.