What is a shuttle shift?

[ragkar]

Yesterday I went to my local auto supply to buy some hydraulic oil for my Case 580K tractor. The guy said that there are many different oils and do I have a shuttle shift?
When I told him that my tractor has a lever on the steering column with three positions forward-neutral-reverse and no clutch he proclaimed that I had shuttle shift.
The oil that I got was Wolf's Head tractor oil type HT.
So what's shuttle shift?

 

[AKKAMAAN]

Yesterday I went to my local auto supply to buy some hydraulic oil for my Case 580K tractor. The guy said that there are many different oils and do I have a shuttle shift?
When I told him that my tractor has a lever on the steering column with three positions forward-neutral-reverse and no clutch he proclaimed that I had shuttle shift.
The oil that I got was Wolf's Head tractor oil type HT.
So what's shuttle shift?

Basically the same way of shifting as in an automatic transmission (no torque converter though)....F-N-R...as D-N-R on a car....No gears are moved when shifting...lever operates a hydraulic valve, that directs oil to "cylinders" that lock "clutch-packs" into gear...the rest of shifting 1st-2nd-3rd gear etc can be designed in different ways...foot clutch and stick gear, gear selector, etc

These clutches are made of a bronze like metal, and are wet in oil, thats why they need a certain oil quality.....

 

[ragkar]

Thanks AKKAMAAN That explains the how and why very nicely.