Lely Roterra power harrow service schedule

1. Lower the harrow to the ground, stop the tractor and take the key out.
2. Clean the machine.
3. Check each Allen socket-head tine bolt with a torque wrench at 600 Nm (60 kgm).
4. Coat the machine with a rust preventive if it will stand.

Tools: Torque wrench (to 600 Nm), Allen socket to suit

1. Stop the tractor and take the key out.
2. Grease the nipples on both cross joints and the guard tubes.
3. Pull the shaft apart and grease the profile tubes.
4. In freezing weather, grease the guard tubes after work.

Tools: Grease gun

1. Stop the tractor and take the key out.
2. Grease or oil every pivot: roller arms, levelling board arms, soil deflectors and the floating system.
3. Wipe off surplus.

Tools: Grease gun, Oil can

1. Let the gearbox cool: it gets very hot after long, hard work. Wear gloves.
2. Tilt the harrow slightly forwards and put a tray in front of the gearbox.
3. Unscrew the drain plug and let the oil run out.
4. Refit the drain plug and fill with 5.2 L of ISO VG 680 gear oil.
5. Check with the dipstick: the level should be between the end of the dipstick and the groove.
6. Check the gearbox breather is clean, or pressure builds up and the seals leak.

Tools: Drain tray (10 L), Spanners, Funnel, Gloves

1. Support the raised harrow on stands, stop the tractor and take the key out.
2. Fit tines so they trail in the direction of turn, bulges at the tips facing back.
3. When fitting a tine holder, put Loctite 640 on the rotor shaft. Tighten the holder nut to 250 Nm and fit a new split pin.
4. Tighten the tine bolts to 600 Nm.
5. Recheck the bolts after the harrow has worked a couple of hours.

Tools: Torque wrench (to 600 Nm), Allen socket, Socket for the holder nut, Stands

1. Grease every point in the lubrication list, plus the spring-loaded locking pins of the PTO yoke.
2. Check the PTO shaft slides in and out easily.
3. Check all nuts and bolts, especially the trough top lids, gearbox and bearing housings. Use the torques in the manual's table; the support tube bolts are M10 10.9: 55 Nm, M12 10.9: 95 Nm.
4. Check the tines are at 600 Nm.
5. Check the trough grease is 2–3 cm up from the bottom of the gears. It does not need changing, only topping up, unless soil has got in.
6. Check the gearbox breather is clean and the oil is between the end of the dipstick and the groove.
7. Check the rotor guard springs are stretched to about 270 mm (about 290 mm with a levelling board).
8. Check all safety decals are present and readable.

Tools: Grease gun, Torque wrench, Rule