10-06-2017, 04:13 AM
The hydraulic cylinder for the 3-point linkage was scored badly, no doubt part of the reason why the lift was unuseable once the oil warmed up a bit. The scores were too deep to just hone out and use the same piston- which is itself deeply scored. A replacement cylinder for this model turns out to be unobtainable, and the smaller ones for the 3000 series are available as a reproduction new unit but for around US$800 which would work out to around $1500 Aussie dollars shipped, and would represent a significant loss of lift power; the existing cylinder bore is 3.300" whereas the 3000 model one is 3".
I decided to have a go at boring the cylinder to the next standard hydraulic size, which is 85mm, and making a new piston that will take an off-the-shelf single-acting ram seal.
Getting this cylinder to run true in the 4-jaw chuck took about the longest of anything I have chucked.
I took really light cuts to avoid pulling the thing out of the chuck, and a fine feed to try and get the best finish I could.
I'm going to take it to a local engine reconditioner to hone it to a smooth, accurate finish. I couldn't get rid of all the chatter so I left .008" on the bore diameter for the honing.
The end of the brake shaft where the clutch pedal pivots looked like this.
I ground the worn section to a fresh surface and coated it with some loctite metal epoxy, the stuff you knead. Got it in the lathe to harden overnight so i can turn it to size tomorrow.
It's nice that the machine tools are coming into their own on this project. I was able to tell my wife that the lathe has almost paid for itself with that lift cylinder.
I decided to have a go at boring the cylinder to the next standard hydraulic size, which is 85mm, and making a new piston that will take an off-the-shelf single-acting ram seal.
Getting this cylinder to run true in the 4-jaw chuck took about the longest of anything I have chucked.
I took really light cuts to avoid pulling the thing out of the chuck, and a fine feed to try and get the best finish I could.
I'm going to take it to a local engine reconditioner to hone it to a smooth, accurate finish. I couldn't get rid of all the chatter so I left .008" on the bore diameter for the honing.
The end of the brake shaft where the clutch pedal pivots looked like this.
I ground the worn section to a fresh surface and coated it with some loctite metal epoxy, the stuff you knead. Got it in the lathe to harden overnight so i can turn it to size tomorrow.
It's nice that the machine tools are coming into their own on this project. I was able to tell my wife that the lathe has almost paid for itself with that lift cylinder.
Lathe (n); a machine tool used in the production of milling machine components.
Milling Machine (n); a machine tool used in the production of lathe components.
Milling Machine (n); a machine tool used in the production of lathe components.