Your shop manual isn't going to tell you squat about a "thumb."
There was no such thing when your backhoe was built.
That thumb is some aftermarket or homemade add-on and either has a generic hose or a custom hose. Either way you will need to take it off to see what you have. You may luck out and it will have NPT ends on both ends and you can get it off the shelf at Tractor Supply, Rural King, or whatever big box "farm" store you have in your area.
Any hose you can get today will have more pressure capacity than this machine can make.
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
... [Read Article]
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