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A sprinkler includes a turbine, a nozzle, a planetary gear drive and a reversing mechanism. The planetary gear drive and the reversing mechanism rotatably couple the turbine and the nozzle. The planetary gear drive includes a control shaft that is axially movable to shift a direction of rotation of

A sprinkler includes a turbine, a nozzle, a planetary gear drive and a reversing mechanism. The planetary gear drive and the reversing mechanism rotatably couple the turbine and the nozzle. The planetary gear drive includes a control shaft that is axially movable to shift a direction of rotation of an output stage that is coupled to the reversing mechanism. The reversing mechanism includes a shift member secured to an upper end of the control shaft. The reversing mechanism further includes a pivotable shift fork with a first cam and a second cam spaced from the first cam. The first cam is configured to engage the shift member and raise the control shaft when the shift fork is pivoted to engage the first cam with the shift member. The second cam is configured to engage the shift member and lower the control shaft when the shift fork is pivoted to engage the second cam with the shift member.

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1. A sprinkler, comprising: a turbine;a nozzle; anda planetary gear drive and a reversing mechanism that rotatably couples the turbine and the nozzle, the planetary gear drive including a control shaft that is axially movable to shift a direction of rotation of an output stage that is coupled to the

1. A sprinkler, comprising: a turbine;a nozzle; anda planetary gear drive and a reversing mechanism that rotatably couples the turbine and the nozzle, the planetary gear drive including a control shaft that is axially movable to shift a direction of rotation of an output stage that is coupled to the reversing mechanism, the reversing mechanism including a shift member secured to an upper end of the control shaft, and a pivotable shift fork with a first cam and a second cam spaced from the first cam, the first cam configured to engage the shift member and raise the control shaft when the shift fork is pivoted to engage the first cam with the shift member, and the second cam configured to engage the shift member and lower the control shaft when the shift fork is pivoted to engage the second cam with the shift member. 2. The sprinkler of claim 1 and further comprising a riser enclosing the planetary gear drive, an outer case surrounding the riser, and a coil spring surrounding the riser and normally holding the riser in a retracted position within the case and compressible to allow the riser to telescope to an extended position when pressurized water is introduced into the case. 3. The sprinkler of claim 1 wherein the nozzle is carried inside a nozzle turret rotatably mounted at the upper end of the riser. 4. The sprinkler of claim 1 wherein the reversing mechanism further includes a housing and a shift crank pivotally supporting the shift fork in the housing. 5. The sprinkler of claim 4 wherein the reversing mechanism further includes an over-center spring biasing the shift fork so that either the first cam or the second cam is engaged with the shift member. 6. The sprinkler of claim 5 wherein the over-center spring is a coil spring having a first end connected to the housing and a second end connected to the shift crank. 7. The sprinkler of claim 4 and further comprising a shift toggle extending from the housing, the shift toggle being connected to the shift crank. 8. The sprinkler of claim 7 wherein the sprinkler further includes a fixed arc tab extending from a gear box housing of the planetary gear drive in a predetermined location so that the fixed arc tab can be engaged by the shift toggle as the housing is rotated by the planetary gear drive to pivot the shift fork to cause one of the first and second cams to engage the shift member. 9. The sprinkler of claim 7 wherein the sprinkler further comprises a nozzle turret carrying the nozzle, a carrier ring coupled to the nozzle turret and rotatable relative to the housing, a bull gear ring coupled to the carrier ring, and an adjustable arc tab extending from the carrier ring in a predetermined location so that the adjustable arc tab can be engaged by the shift toggle as the housing is rotated by the planetary gear drive to pivot the shift fork to cause the other one of the first and second cams to engage the shift member. 10. The sprinkler of claim 9 and further comprising and an adjusting gear supported for rotation by the nozzle turret that engages the bull gear and permits a user to move the adjustable arc tab to a predetermined circumferential location that adjusts a size of an arc of oscillation of the nozzle. 11. A sprinkler, comprising: a nozzle:a planetary gear drive with an output stage, a direction of rotation of the output stage being reversible by axial motion of a control shaft;a turbine coupled to an input stage of the planetary gear drive; anda reversing mechanism coupled between the output stage of the planetary gear drive and the nozzle, including a pair of cams that alternately engage a shift member connected to the control shaft. 12. The sprinkler of claim 11 wherein the drive member has a barrel shape. 13. The sprinkler of claim 11 wherein the cams are formed on a pivotable shift fork. 14. The sprinkler of claim 13 wherein the shift fork is pivotally mounted within a housing on a shift crank. 15. The sprinkler of claim 14 wherein the shift crank is pivotable by moving a shift toggle when it engages a pair of arc tabs. 16. The sprinkler of claim 15 and further comprising an over-center spring connected between the housing and the shift crank. 17. The sprinkler of claim 11 wherein each cam has a sloped surface. 18. The sprinkler of claim 11 and further comprising a nozzle turret that encloses the nozzle and is coupled to the reversing mechanism, and mechanisms partially mounted in the nozzle turret for moving an adjustable arc tab. 19. The sprinkler of claim 18 and further comprising a fixed arc tab connected to a gear box of the planetary gear drive. 20. A sprinkler, comprising: a turbine;a nozzle turret including a nozzle;a riser;a planetary gear drive mounted in the riser, the planetary gear drive having an input stage coupled to the turbine, and a control shaft that is axially movable to shift a direction of rotation of an output stage of the planetary gear drive;a reversing mechanism that rotatably couples the output stage of the planetary gear drive and the nozzle turret, the reversing mechanism including a shift member secured to an upper end of the control shaft of the planetary gear drive, a pivotable shift fork with a first cam and a second cam spaced from the first cam, the first cam configured to raise the control shaft when the shift fork is pivoted to engage the first cam with the shift member, the second cam configured to lower the control shaft when the shift fork is pivoted to engage the second cam with the shift member, the reversing mechanism further including a housing and a shift crank pivotally supporting the shift fork in the housing, an over-center coil spring biasing the shift fork so that either the first cam or the second cam is engaged with the shift member, the coil spring having a first end connected to the housing and a second end connected to the shift crank, and a shift toggle extending from the housing, the shift toggle being connected to the shift crank;a fixed arc tab extending from a gear box housing of the planetary gear drive in a predetermined location so that the fixed arc tab can be engaged by the shift toggle as the housing is rotated by the planetary gear drive to pivot the shift fork to cause one of the first and second cams to alternately engage the shift member;a carrier ring rotatably attached to the riser;an adjusting gear ring coupled to the carrier ring;an adjustable arc tab extending from the carrier ring in a predetermined location so that the adjustable arc tab can be engaged by the shift toggle as the housing is rotated by the planetary gear drive to pivot the shift fork to cause one of the first and second cams to engage the shift member; andan adjusting gear supported for rotation by the nozzle turret that engages the adjusting ring gear and permits a user to move the adjustable arc tab to a predetermined circumferential location that adjusts a size of the arc of oscillation of the nozzle. 21. A sprinkler, comprising: a riser;a planetary gear drive mounted inside the riser;a turbine coupled to an input shaft of the planetary gear drive;a nozzle turret; anda reversing mechanism coupling an output stage of the planetary gear drive and the nozzle turret that axially shifts a gear within the planetary gear drive to change a direction of rotation of the output stage.