This repair manual provides instructions for repairing ARION 650-620 and ARION 550-520 tractors manufactured between the specified serial numbers. It details the procedures for removing and installing engine components like the timing cover, front panel, camshaft, and oil pressure controller. Precise tightening torques and the correct order for tightening fasteners are specified. Special tools are required to remove the oil pressure controller.

1. ARION 650-620
ARION 550-520
Repair manual
Original repair manual
1/1Couverture RHB ARION 650-620 – ARION 550-530 (A36-A34)
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2. Validity of this repair manual
This repair manual applies to the following tractors:
Description Type
Tractor serial number
from to
ARION 600 A36 A3600050 —
ARION 500 A34 A3400050 —
1/1Validité du manuel de réparation (A36-A34) Arion 650-530
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3. Complete engine
Number Value CCN Note – Description
1 860 kg — Complete 6-cylinder engine
1 700 kg — Complete 4-cylinder engine
For unspecified tightening torques, refer to the section entitled "Tightening torques".
WARNING
Lifting heavy components.
Risk of death or serious injury.
– Use lifting equipment that will support the load.
– Use reliable lifting equipment.
– Placer the lifting equipment on the appropriate locations.
1/1Moteur complet (A36-A34) Arion 650-530
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4. Coupling the engine to the chassis
Number Value CCN Note – Description
1 130 N.m + 40° — H, M16 x 2.00 CL 10.9 nut
2
50 ± 5 N.m
—
M16 x 2.00 L 80 CL 10.9 stud
Coat the studs with Loctite (638).
3 —
M14 x 1.50 L 82 CL 10.9 stud
Coat the studs with Loctite (638).
4 195 ± 20 N.m — H, M14 x 1.50 CL 10.9 nut
5 240 N.m — H, M14 x 1.50 L 80/34 CL 12.9 screw
6
Without play
+ 0.1 mm
— Shim
For unspecified tightening torques, refer to the section entitled: "Tightening torques".
Preparation for work
Consumables to be used
- Sealing and glue product:
Loctite (638) – 60 0136 585 0.
1/1Accouplement du moteur au châssis
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5. Timing cover
6 cylinders
Number Value Note – Description
1 —
Diagram for applying the flexible seal to the cylinder block.
Use Loctite (515).
2 8 kg Weight of front panel.
3 25 N.m Torx® milled head bolts.
Observe the tightening
order as illustrated.
4
35 N.m
M10 x 84 studs.
5 M10 x 68 studs.
6 Torx® bolt.
7 —
Timing cover seal.
The surfaces that will come into contact with the seal must be clean
and dry before fitting.
8 4 kg Weight of the timing cover
9
35 N.m
M10 nuts
Observe the tightening
order as illustrated.
10 M8 x 60 bolt
11 M8 x 50 bolt
12 M8 x 40 bolt
13 60 N.m
Access plug to the high-pressure pump pinion.
Use a new O-ring.
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6. Number Value Note – Description
14
97 N.m Oil pressure controller.
120 mm Length of the controller spring.
42.5 mm Length of the controller spring at a tension between 60 and 75 N.
For unspecified tightening torques, refer to the section entitled: "Tightening torques".
4 cylinders
Number Value Note – Description
1 —
Diagram for applying the flexible seal to the cylinder block.
Use Loctite (515).
2 8 kg Weight of front panel.
3 25 N.m Torx® milled head bolts.
Observe the tightening
order as illustrated.
4
35 N.m
M10 x 84 studs.
5 M10 x 68 studs.
6 Bolts (to be tightened when refitting the timing cover) .
7 —
Timing cover seal.
The surfaces that will come into contact with the seal must be clean
and dry before fitting.
8 4 kg Weight of the timing cover
9
35 N.m
M10 nuts
Observe the tightening
order as illustrated.
10 M8 x 50 bolt
11 M8 x 60 bolt
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7. Number Value Note – Description
12 60 N.m Access plug to the high-pressure pump pinion.
Use a new O-ring.
13 — Oil pressure controller.
For unspecified tightening torques, refer to the section entitled: "Tightening torques".
CAUTION
Contact with very hot liquids or machine parts.
Risk of burns
► Wear suitable protective clothing.
► Allow liquids or machine parts to cool.
► Follow the instructions in the operator's manual.
Environment!
Lubricants and fuel are harmful to the environment.
Pollution
► Collect lubricants and fuel in appropriate containers; store and dispose of them in accordance with the
regulations in force.
WARNING
Lifting heavy components.
Risk of death or serious injury.
– Use lifting equipment that will support the load.
– Use reliable lifting equipment.
– Placer the lifting equipment on the appropriate locations.
Preparation for work
Consumables to be used:
- Sealing and glue product:
Loctite (515) – 60 0571 950 5.
Special tool
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8. Special tool
Tool for fitting and removing the oil pressure controller.
No. 60 0500 557 3
Special tool
Slide hammer
No. 77 0138 805 8
Removing the timing cover
► Drain the engine oil.
► Remove the sump.
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9. Sump
► Remove the fan and its support.
Ventilation and beltsFunction:01 Engine
► Remove the fan belt tensioner (1) and the roller (2).
Ventilation and beltsFunction:01 Engine
► Remove the water pump (3).
Water pump
► Remove the crankshaft torsional absorber (4).
Crankshaft torsional absorber
► Remove the front bearing seal.
Crankshaft bearing seals
On a 6-cylinder engine, remove the oil pressure controller (5).
Timing cover
► Remove the bolts (1) securing the clamps on the wiring harness for the crankshaft position sensor (B231).
► Remove the crankshaft position sensor (B231) (2).
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10. Note the position of the bolts and nuts before removing them.
► Remove the bolts (1) and nuts (2) of the timing cover.
On a 4-cylinder engine, remove the bolt (3) located behind the front panel.
► Remove the timing cover.
Removing the front panel
On a 4-cylinder engine, remove the oil pressure controller.
Timing cover
► If necessary, remove the thermostat unit.
► Remove the camshaft (1).
Camshaft and bearing shells
► Remove the high-pressure injection pump (2).
High-pressure pump
► Remove the target from the crankshaft sensor (3).
Crankshaft sensor target
► Remove the upper intermediate pinion (4).
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11. ► Remove the lower intermediate pinion (5).
► Remove the oil pump (6).
On a 4-cylinder engine, remove the two balancer shafts (7).
Balancer shaft
► Remove the studs (1).
On a 6-cylinder engine, remove the bolt (2).
► Remove the Torx® milled head bolt (3).
► Remove the front panel (4).
Fitting the front panel
Respect the technical specifications from the overview.
Check that the surfaces of the cylinder block and front panel are free from oil, remaining sealing
paste or cleaning products before applying the sealing product.
► Apply a continuous bead of Loctite (515) to the cylinder block, respecting the application diagram.
► Fit the bypass valve (1) in the cylinder block if it was removed.
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12. Respect the technical specifications from the overview.
► Fit the front panel.
► Fit the bolts (3) and studs (1) and tighten them to the recommended torque, respecting the tightening order.
On a 6-cylinder engine, fit and tighten the bolt (2) to the recommended torque.
On a 4-cylinder engine, set the timing of the balancer shafts (7) and lower intermediate pinion (5).
Timing pinions
On a 6-cylinder engine, fit the oil pump (6).
Oil pump
On a 6-cylinder engine, fit the lower intermediate pinion (5).
Timing pinions
► Fit the camshaft (1).
Camshaft and bearing shells
► Set the timing of the camshaft and upper intermediate pinion (4).
Timing pinions
► Fit the target of the crankshaft sensor (3).
Crankshaft sensor target
On a 4-cylinder engine, fit the oil pressure controller.
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13. Timing cover
► Fit the timing cover.
► Fit the high-pressure injection pump (2).
High-pressure pump
► Fit the thermostat unit if it was removed.
Thermostat unit
Fitting the timing cover
Respect the technical specifications from the overview.
► Install a new seal (1) and fit the timing cover (2).
► Fit and tighten the bolts (3) and nuts (4) to the recommended torque, respecting the tightening order.
Respect the technical specifications from the overview.
► Fit and tighten the bolt (1) to the recommended torque.
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14. ► Fit the crankshaft position sensor (B231) (2).
SensorsFunction:01 Engine
► Fit and tighten the bolts (1) securing the clamps on the wiring harness for the crankshaft position
sensor (B231).
Respect the technical specifications from the overview.
On a 6-cylinder engine, fit the oil pressure controller (5).
Timing cover
► Fit the sump.
Sump
► Fit the front bearing seal.
Crankshaft bearing seals
► Remove the crankshaft torsional absorber (4).
Crankshaft torsional absorber
► Fit the water pump (3).
Water pump
► Fit the fan belt tensioner (1) and the roller (2).
Ventilation and beltsFunction:01 Engine
► Fit the fan and its support.
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15. Ventilation and beltsFunction:01 Engine
► Top up the engine oil.
Removing the oil pressure controller
6 cylinders
► Undo the pressure controller (1).
► Remove the bolt, sealing washer, spring and pressure controller.
4 cylinders
► Remove the timing cover.
Timing cover
► Fit the extractor of the special tool (1) on the pressure controller (2). Check that the claws (4) are secure in
the slots (3) in the valve.
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16. ► Insert the sleeve (1) of the special tool fully over the valve extractor.
► Using the special tool (1) equipped with a 11/16 – 16 (UNF) threaded end piece, remove the pressure
controller (2).
Fitting the oil pressure controller
6 cylinders
Respect the technical specifications from the overview.
► Check the spring to decide whether to re-use it or replace it.
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18. Position the sealing washer (1) in the right direction as illustrated.
► Insert the pressure controller assembly in the opening in the timing cover.
► Tighten the pressure controller to the recommended torque.
4 cylinders
► Insert the insertion tool (1) of the special tool in the pressure controller (2).
► Using a hammer, push the controller fully into the bore (3) in the engine block.
► Fit the timing cover.
Timing cover
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19. Engine flywheel housing
Number Value Note – Description
1 70 kg Weight of the engine flywheel housing
2 — Lubricate the camshaft O-ring with clean engine oil
3 —
The surfaces that will come into contact with the seal must be
clean and dry before fitting
4
530 N.m
M20 x 70 bolt
Lubricate the
bolt threads and
observe the
tightening order
as illustrated
5 M20 x 100 bolt
6 110 N.m M12 x 38 bolt
7
130 N.m
M16 x 60 bolt
+ 45°
8 230 N.m M16 x 70 bolt
9 73 N.m M10 x 185 bolt
For unspecified tightening torques, refer to the section entitled: "Tightening torques".
WARNING
Lifting heavy components.
Risk of death or serious injury.
► Use certified slings or chains in perfect working order.
► Use a certified hoist in perfect working order.
► Use a certified jack or stand which can support the load.
1/3Carter du volant moteur
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20. ► Use the jack or stand on a flat, horizontal, sufficiently firm surface.
► Place the jack or stand in a suitable location.
WARNING
Lifting heavy components.
Risk of death or serious injury.
– Use lifting equipment that will support the load.
– Use reliable lifting equipment.
– Placer the lifting equipment on the appropriate locations.
Removal
► Remove the electric starting motor. The electric starting motor and the engine flywheel housing can be
removed as one unit.
The engine flywheel housing is heavy. Take precautions when handling to avoid injury.
► Remove the bolts securing the engine flywheel housing to the cylinder block and the bolts securing the
engine flywheel housing to the oil sump.
► Remove the engine flywheel housing from the block.
Fitting
► Inspect and clean the contact surfaces on the cylinder block and the engine flywheel housing. Remove any
product or sealing material previously applied.
Do not apply sealing product to the gasket or to the contact surfaces on these housings.
► Fit a new camshaft O-ring (1).
► Fit the seal (2).
Respect the technical specifications from the overview.
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