Kuhn GF 502 service schedule

Tedders and rakes · Current (operator's manual KN245BGB_B, 07-2019)

Covers the Kuhn GF 502 (Gyrotedder).

Every maker's service job for the Kuhn GF 502, counted in hours, with the oils, filters and parts each one needs. Add your implement to Farmyard Workshop and it works out what's due from your hours and dates, and keeps the service history.

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Service intervals

Job	When
PTO shaft lubrication	every 8 hours
Tine check and replacement	every year
Start-of-season checks	every year
End-of-season lay-up	every year

Service jobs and parts

PTO shaft lubrication

PTO shaft · every 8 hours

Kuhn: universal joints every 8 hours, the transmission tube every 20 hours and the guide rings every 40 hours, and more often in hard use.

Part	Qty	Notes	Part number
Grease	1	Multi-purpose NLGI 2. Aztec Oils match: VOLCATEC LITHIUM EP 2	check your handbook

Step-by-step

Lower the tedder to the ground in work position, disengage the PTO, stop the tractor engine, take the key out and apply the parking brake. Wait until the rotors have stopped.
Grease the universal joints (every 8 hours).
Grease the transmission tube every 20 hours and the guide rings every 40 hours.
Check the guard is complete, turns freely and is chained.
Never run the shaft at more than 30°.

Tools: Grease gun, Rags

Tine check and replacement

Tines · every year

Kuhn's end-of-season list says inspect the tines and replace worn or damaged ones. Each tine bolt is torqued to 16 daNm (160 Nm).

Part	Qty	Notes	Part number
Tine, right-hand	1	Genuine Kuhn, listed by Partao for GF 502 / 502 T / TH / MH. Per tine, as needed. Newer number series than 58740600; check against the old tine	K2518370
Tine, left-hand (anticlockwise)	1	Kuhn number 58740600 (587.406.00), listed by Agri-Can as fitting GF 502. Per tine, as needed. Check the hand against the rotor	58740600
Tines	1	As needed: two types, for clockwise and anticlockwise rotors. Genuine Kuhn: check your handbook	check your handbook

Step-by-step

Unfold the tedder into work position on the ground, disengage the PTO, stop the tractor engine, take the key out and apply the parking brake. Wait until the rotors have stopped.
If you have to work with the wings raised, make sure they are locked in transport position. Never stand under a raised wing held only by the hydraulics.
Check every tine for bends, cracks and wear.
Remove the attachment screw (1) and take off the worn tine.
Fit the right type for that rotor's direction, so the crop pressure closes the coils.
Check the bolt, washer and nut and replace any that are worn.
Make sure the tine sits properly in the tine arm and tighten the screw to 16 daNm (160 Nm).

Tools: Torque wrench (to 160 Nm), Spanners, Gloves

Start-of-season checks

Storage · every year

Kuhn's start-of-season list, plus the central gearbox level check, which the manual gives without an interval.

Part	Qty	Notes	Part number
Grease (gearbox top-up)	1	Multi-purpose NLGI 2; the gearbox holds 0.8 kg. Aztec Oils match: VOLCATEC LITHIUM EP 2	check your handbook

Step-by-step

Read through the operator's manual again.
Lower the tedder in work position, disengage the PTO, stop the tractor engine, take the key out and apply the parking brake. Wait until the rotors have stopped.
Wipe the grease off the ram rods.
Set the tyres to 2.0 bar (29 psi).
Check all nuts and bolts are tight.
Central gearbox: take out the 4 bolts and the cover, check the level and top up with NLGI 2 grease. Refit the cover and torque the bolts to 3 daNm (30 Nm).
Grease the outer wing pivot pins, the Digidrive coupling fingers, the rotor hubs and the rotor housings.
Check all guards are in place.
Check the road lights and side marker boards are fitted, clean and working.

Tools: Tyre pressure gauge, Torque wrench, Spanners, Grease gun

End-of-season lay-up

Storage · every year

Kuhn's end-of-season list.

Step-by-step

Lower the tedder, disengage the PTO, stop the tractor engine and take the key out. Wait until the rotors have stopped.
Clean the machine thoroughly.
Lubricate every lubrication point.
Grease the exposed ram rods.
Set the tyres to 2.0 bar (29 psi).
Touch up damaged paint.
Inspect the tines and replace worn or damaged ones (see the tine task).
Store it under cover, somewhere dry, on its stands with the wings down or locked.

Tools: Grease gun, Tyre pressure gauge, Touch-up paint

Oils, fluids and capacities

System	Oil or spec	Capacity
Central gearbox	Multi-purpose grease NLGI 2	0.8 kg
Grease points and PTO shaft	Multi-purpose grease NLGI 2
Pivots and wing ram pins	Kuhn lists an SAE 80W-90 lubricant for these

Specifications


Working width	5.00 m
Rotors	4, with 6 tine arms each
Hitch	3-point, Category 1 and 2
PTO	540 rpm; min 15 kW (20 hp)
Weight	522 kg
Tyres	15/6.00-6 at 2.0 bar (29 psi)
Transport size	2.84 m wide, 2.65 m high
Hydraulics	Max working pressure 200 bar
Tine bolt torque	16 daNm (160 Nm)
Gearbox cover bolts	3 daNm (30 Nm)
PTO shaft	Max 30° joint angle

Known problems

Thrown tines

A broken or loose tine can be thrown out. Keep the tine bolts at 160 Nm and keep people well away while tedding.

Folding wings

Stay clear of the wings while they fold or unfold, and never work under a raised wing unless it is locked.

Repair guides

Tedder tine and tine bolt replacement (Easy, 15 minutes per tine): Broken, bent or missing tines, tines loose in the arm, crop not spread evenly.
Folding wings and transport lock faults (Moderate, 30–90 minutes): Wings will not lock in transport, locks not engaging, stop pins not releasing, wings dropping or creeping.
Central gearbox and rotor housing leaks (Moderate, 1 hour (seal work: dealer)): Grease or oil coming out round the central gearbox cover or rotor housings, gearbox noisy or hot.
PTO shaft repair: universal joint cross and bearing, and guard replacement (Moderate, 1–3 hours): Play or clicking in a universal joint, rust coming out of the bearing cups, vibration, split or worn guard cones, guard not turning freely, missing chain.
Tyre and wheel bearing checks and repair (Moderate, 1–2 hours per wheel): Wheel wobbling or growling, hub hot after work, grease thrown out of the hub, soft or cut tyre, wheel nuts loose.

The full step-by-step guides are in Farmyard Workshop once you add your implement.

Parts list with genuine part numbers

Wear parts per Partao (Kuhn genuine listings), GF 502

Wear parts

Part	Part number	Qty	Notes
Tedder tine, right	K2518370	per tine	Wear part. Genuine per Partao; fitment names GF 502
Tedder tine (fork)	4803003	per tine	Wear part. Genuine per Partao; fitment names GF 502, GF 502 T, GF 502 TH. Listing title says Fork, description says tedder tine
Tine arm (tooth arm)	58557710	per tine arm	Wear part. Genuine per Partao; fitment names GF 502, GF 502 T
Tedder tine, left	58740600	per tine	Wear part. Genuine Kuhn number per Sparex S.78951 OEM list (also John Deere E126666); suitable-for names GF502

Sources

Open Farmyard Workshop