davesisk
Platinum Member
Who can (and is willing) to describe a little about the hydraulic layouts in the Power-tracs? (I'm particularly interested in my older 1418 of course, if anyone has any knowledge...<g>) I'm hoping this thread will be educational for everyone, not just me!
In mine, there's apparently a gear-type pump on the front of the engine that's fed by the tank with filter in between. I gather than the wheel motors are driving by this pump, as well as a supply to a 2nd pump. There's a right/left throttle operated switch on pump #1 that (I'd guess) sends oil in the right direction to splitters for the wheel motors, then a line that goes to the presumably piston-type pump #2 mounted on the back of the engine. Pump #2 (according to Don at Power-trac) powers the steering cylinders, lift arms, and external hydraulic ports.
So, questions (somewhere between theory and practice, I guess).
1) Does anyone happen to have a layout that shows which lines run where?
2) Why is getting air into the lines such a bad thing? How does it damage the gear-type pumps, for instance? Will it also damage the piston-type pump? If so, why isn't it necessary to bleed lines feeding fluid out of the gear-type pump and into the piston-type pump? I'm assuming the gear-type pump feeds the piston-type pump since there's only one filter. Is this a correct assumption?
3) Why gear-type to drive the wheels, and piston-type to power cylinders? Are gears alway matched with hydraulic motors, and pistons always matched with cylinders? (I'm assuming that the front pump is indeed gear-type and the rear-pump is piston-type. They're certainly shaped differently...)
4) Are there any good books that talk about the types of hydraulic systems you find in these tractors?
Best regards!
Dave
In mine, there's apparently a gear-type pump on the front of the engine that's fed by the tank with filter in between. I gather than the wheel motors are driving by this pump, as well as a supply to a 2nd pump. There's a right/left throttle operated switch on pump #1 that (I'd guess) sends oil in the right direction to splitters for the wheel motors, then a line that goes to the presumably piston-type pump #2 mounted on the back of the engine. Pump #2 (according to Don at Power-trac) powers the steering cylinders, lift arms, and external hydraulic ports.
So, questions (somewhere between theory and practice, I guess).
1) Does anyone happen to have a layout that shows which lines run where?
2) Why is getting air into the lines such a bad thing? How does it damage the gear-type pumps, for instance? Will it also damage the piston-type pump? If so, why isn't it necessary to bleed lines feeding fluid out of the gear-type pump and into the piston-type pump? I'm assuming the gear-type pump feeds the piston-type pump since there's only one filter. Is this a correct assumption?
3) Why gear-type to drive the wheels, and piston-type to power cylinders? Are gears alway matched with hydraulic motors, and pistons always matched with cylinders? (I'm assuming that the front pump is indeed gear-type and the rear-pump is piston-type. They're certainly shaped differently...)
4) Are there any good books that talk about the types of hydraulic systems you find in these tractors?
Best regards!
Dave
