Kuhn GA 6501 service schedule

Tedders and rakes · Current (operator's manual KN255AGB F, 08-2015)

Covers the Kuhn GA 6501 (twin-rotor Gyrorake).

Every maker's service job for the Kuhn GA 6501, 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 shafts and torque limiter lubrication	every 50 hours
Wheel nut, tine screw and gearbox level check	every 50 hours
Start-of-season checks	every year
End-of-season lay-up	every year

Service jobs and parts

PTO shafts and torque limiter lubrication

PTO shaft · every 50 hours

Kuhn: grease the primary and intermediate PTO shafts every 50 hours, including the torque limiter and the constant velocity joint, 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

Put the rake in work position on the ground, disengage the PTO, stop the tractor engine, take the key out and apply the parking brake. Wait until both rotors have stopped.
Check the hydraulic hose taps are shut.
Primary shaft: grease the universal joints, the constant velocity joint (with the shaft straight), the torque limiter, the transmission tube, the guide rings and the locking pins.
Intermediate shaft: grease the universal joints, the central discs, the transmission tube, the guide rings and the push-rods.
Check the guards are complete and chained. Never run a shaft at more than 30°.

Tools: Grease gun, Rags

Wheel nut, tine screw and gearbox level check

Tines · every 50 hours

Kuhn's chart has 'check the gearbox oil level' and 'check the securing elements' with intervals of the first 10 hours, every 50 hours and every 200 hours, but the scan doesn't show which goes where. Set here at the shorter 50 hours. Do it after the first 10 hours on a new rake.

Part	Qty	Notes	Part number
Gear oil (top-up)	1	SAE 80W-90 API GL-5. Aztec Oils match: TRANSMATEC EP-5 80W-90	check your handbook

Step-by-step

Put the rake in 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.
Clear any crop or twine wrapped round the rotors and the rotor undercarriages.
Tighten the transport wheel nuts to 27 daNm (270 Nm).
Tighten the tine mounting screws to 8.5 daNm (85 Nm). Replace bent or broken tines.
Remove the gearbox filler plug and its seal and check the level with a clean slide: it should be 30 mm. Top up with 80W-90 GL-5 if low and refit the plug.
On a new rake, do this after the first 10 hours.

Tools: Torque wrench (to 270 Nm), Spanners, Clean rod or slide for the dip check

Start-of-season checks

Storage · every year

Kuhn's start-of-season list.

Step-by-step

Read through the operator's manual again.
Put the rake 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.
Set all tyres to 2.0 bar (29 psi): transport wheels and rotor wheels.
Check the gearbox oil level (30 mm on the slide).
Wipe the grease off the ram rods.
Check every guard and protection device is in place and in good order.
Oil the transport locks with S 6994 EP90.
Check the road lights and marker boards. Kuhn's signalling kit for Europe is 1147570; clearance lights kit 1016510.

Tools: Tyre pressure gauge, Rags

End-of-season lay-up

Storage · every year

Kuhn's end-of-season list.

Part	Qty	Notes	Part number
Never-seize grease	1	For the rotor arm and tine arm joints	check your handbook

Step-by-step

Put the rake in work position on the ground, disengage the PTO, stop the tractor engine and take the key out. Wait until the rotors have stopped.
Clean it thoroughly, but don't aim a pressure washer at the rotors or pivots.
Clean the joints between the rotor arms and the removable tine arms and pack them with never-seize grease.
Grease the exposed ram rods.
Store it under cover, somewhere dry, folded with the transport locks on or lowered to the ground.

Tools: Brush, Grease gun

Oils, fluids and capacities

System	Oil or spec	Capacity
Main angle gearbox	Gear oil SAE 80W-90, API GL-5 (lubricated for life; level check only)	0.75 L
Grease points and PTO shafts	Multi-purpose grease NLGI 2
Transport locks	All-purpose oil S 6994 EP90

Specifications


Working width	≈5.40–6.40 m
Swath width	≈1.00–2.00 m
Rotors	2, with 10 arms each
Hitch	2-point, Category 2
PTO	540 rpm; min 30 kW (40 hp)
Weight	1,260 kg
Transport size	2.50 m wide, 3.50–4.00 m high, 5.15 m long
Tyres	Transport 195/65R15; rotor wheels 16x6.5-8; all at 2.0 bar (29 psi)
Wheel nut torque	27 daNm (270 Nm)
Tine screw torque	8.5 daNm (85 Nm)
PTO shaft	Torque limiter on the primary shaft; max 30° joint angle

Known problems

Raised rotors

Never stand under a rotor arm raised for transport unless the transport locks are on. Close the hydraulic hose taps before maintenance.

Twine round the rotors

Kuhn says clear wrapped material from the rotors and undercarriages. Stop the PTO and engine and take the key out first.

Lubricated-for-life gearbox

The angle gearbox is filled for life but Kuhn still asks for a level check. A falling level means a leaking seal.

Repair guides

Rotor arm transport locks not engaging (Moderate, 30–90 minutes): Rotor arms will not lock up for transport, locks stiff or rusty, lift stops not releasing, arms creeping down.
Tine arm and tine replacement, and twine wrapped round the rotors (Easy, 30–90 minutes): Bent or broken tine arms, missing tines, crop left in the row, twine or net wrapped round the rotor hubs or undercarriages.
Rotor oscillating shaft (tine arm cam) replacement (Hard, 2–3 hours per arm): A tine arm flaps loosely or does not lift at the swath, knocking from the rotor, worn cam rollers.
Angle gearbox oil level falling: finding the leak (Moderate, 30–60 minutes (seal work: dealer)): Oil on the gearbox or input shaft, level below 30 mm on the dip check, gearbox noisy.
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), GA 6501

Wear parts

Part	Part number	Qty	Notes
Tine arm, right (rake)	K8007120	per tine arm	Wear part. Genuine per Partao (equivalent OEM number 56100712); fitment names GA 6501. Another seller lists it as left side, check side against book
Tine arm, left (rake)	K8007110	per tine arm	Wear part. Genuine per Partao; fitment names GA 6501

Sources

Open Farmyard Workshop