Getting Started With the Kx 57
The Kx 57 is a rotary hay rake made by Kuhn, designed primarily for turning and windrowing hay and straw in field operations. It's a trailed unit with rotating tines that gather crop from a wide swath and deposit it into a single windrow. The machine runs off a standard 540 RPM PTO, which matters because running it at the wrong speed will wreck the pickup and tine mechanism quickly. If you are looking for the full operator documentation, search for the Kx 57 Manual on Kuhn's official dealer portal or request a copy from your local authorized dealer. The manual is usually organized into sections covering setup, adjustment, maintenance intervals, and troubleshooting. Downloading it before you touch the machine is worth the effort since several critical adjustment points are not intuitive from a visual inspection alone.
Kx 57 Manual Key Sections That Actually Matter
Most people skim the manual and miss the parts that save them hours of work. The section on wheel positioning and tine height adjustment is where things usually go wrong on first use. Set the tine height so the tips just kiss the ground when the machine is at operating depth. I learned this the hard way after running a fresh Kx 57 through a dense clover stand on day one and realizing I had the tines set too low, which caused massive tangling and an uneven windrow that took twice as long to pick up later. The manual specifies that tine height should be checked every four to six hours of operation, not just once at setup. Crop conditions change, ground contour changes, and the linkage settles. If you ignore that interval, you will get inconsistent windrow quality and increased power demand on the tractor. The recommended checking interval is about 15 to 20 minutes of downtime per day of work, which is nothing compared to the cost of re-raking or losing yield. Transmission fluid level is another point operators routinely overlook. The gearboxes on the Kx 57 require SAE 90 hypoid gear oil, and the fill plug is located on the side of the gearbox housing. Check the level at the bottom of the fill hole when the machine is sitting level on flat ground. Underfilling leads to premature bearing wear, especially in the main rotor shaft area. Overfilling causes seal leaks and overheating during extended use. The manual gives a capacity figure in liters, but the practical test is the oil should be at the lower edge of the fill hole when cold.
Common Setup Mistakes and How to Avoid Them
The transport width and field width settings are adjustable but require removing pins and repositioning the frame sections. Operators often skip the manual's diagram for frame folding and try to eyeball it. This leads to misaligned pin holes and stripped threads on the locking pins. Always align the holes before forcing the pins in. If a pin does not slide in smoothly, do not hammer it. Back off, realign, and check for debris or bent brackets. I once forced a transport lock pin on a used unit and sheared it off, which required drilling and welding a new mounting tab. That took two days off the scheduling and cost roughly 400 euros in parts and labor. The PTO shaft length is another area where mistakes are common. The PTO must not bottom out at full suspension travel and must not separate at full rebound. Measure the distance between the tractor PTO output and the implement input with both the tractor and implement on level ground in their normal working positions. Add approximately 15 percent for safety clearance. The Kx 57 comes with an overslung PTO guard and a slip clutch protector, but only if you have not swapped components after purchase. Verify the slip clutch torque setting against the manual specification before first use. A slipped clutch that is too loose will damage the PTO shaft splines over time, and one that is too tight will not protect the gearbox when a rock or hard object enters the pickup.
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Maintenance Schedule That Actually Works
Grease fittings are located on the main rotor bearings, the wheel bearings, and the PTO input shaft. The manual calls for greasing every 10 hours, but in dusty harvesting conditions, that interval drops to about 6 hours. If you are working in clean conditions with minimal debris, 10 hours is acceptable. Use a standard lithium-based multipurpose grease. Do not mix grease types, and do not over-grease to the point of extrusion from every seal. Excessive grease pressure will push out the existing sealant and allow contaminants in. Check the tine bolts and replacement tines every 25 hours. Worn tines change the pickup angle and reduce efficiency. The manual lists the torque specification for tine bolts, which is typically around 25 to 30 Nm depending on the fastener size. Use a torque wrench. Going by feel with an impact driver will either strip the threads or leave the tines loose enough to bounce out during operation. The drive chain or belt tension should be checked monthly during heavy use. Chain-driven units require lubrication with a light machine oil, not grease. Belt-driven units need inspection for cracking and glazing. If a belt shows any signs of fraying on the edges, replace it immediately rather than hoping it lasts through harvest. A broken belt in the middle of a field at 90 degrees Celsius ambient temperature is not a fun situation.
When the Kx 57 Fails and What to Do
There are situations where this machine simply does not perform well, and no amount of adjustment will fix it. Heavy, wet, or tangled crop is one. The Kx 57 is a rotary rake optimized for relatively dry and loose material. If you are raking green alfalfa that is still damp from dew, the tines will throw material rather than gather it cleanly, and the windrow will be scattered and inconsistent. In those conditions, a drag rake or a different implement type is more appropriate. The manual mentions this limitation briefly in the performance section, but it is easy to gloss over when you are behind on scheduling. Another limitation is steep slope operation. The Kx 57 has a relatively high center of gravity when fully loaded with crop in the windrow path, and lateral stability decreases significantly on gradients above 12 to 15 percent. I operated one on a contoured field with sections approaching 18 percent grade and experienced noticeable drifting and uneven pickup. The manufacturer's manual states a maximum operating slope, and exceeding it voids the warranty while creating a real safety risk. Use a lower slope path or consider a different machine for that terrain. If the rotor begins to vibrate excessively during operation, stop immediately and inspect for bent tines, damaged rotor arms, or accumulated material buildup inside the housing. Do not attempt to run the machine past this point. Continued operation with an imbalance will damage the main bearings within minutes, and a main bearing replacement requires partial disassembly of the rotor assembly, which is a multi-hour job even for someone who has done it before.
Replacement parts are generally available through Kuhn dealers, but some items have longer lead times, particularly during peak season. The tine assemblies, PTO shafts, and gearbox components are the most commonly replaced items. Keep a spare set of tines and a spare PTO shear bolt on hand if you are running this machine through an entire harvest season. The cost of a few spare tines is negligible compared to the downtime cost of waiting for a part to arrive in the middle of optimal drying conditions.
