What pump does it have? When you get in that power class, the term 'Perkins' got used pretty loosely. There are some things wandering around with yellar paint on them that get called Perkins in some cases, Cat in others... and in reality are ISM (Shibura) engines. Think NewHolland... Those will have Kiki works inserted directly into a block arpeture and are a rack controlled port and helix. So you could have a sticky rack or some slop in the govenor... If it's a real Brit Perkins with a Lucas pump... I guess it could have a govenor problem but I'd really expect it to be more related to drawing air somewhere. They do strange things when they get a bit of air or some other obstruction. An airleak would also be possible on the Kiki pump... That's really where I'd look first or a possible obstruction in the tank... crud floating around and sometimes obstructing the outlet.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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