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6 - Maintenance
Venting the Boom Hydraulics
If disassembling the hydraulic cylinders or hoses, it is necessary to vent the cylinders after reassembly.
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DANGER! Failing to vent the hydraulic system when needed, may result in violent boom movements and poor boom
performance. Risk of damage to the boom parts or foreign objects nearby. Risk of severe injuries or death.
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ATTENTION! Not all hydraulic cylinders have a venting option. In this case, you must loosen the hydraulic hose
connected to the cylinder to let the air out this way. Note that ORFS fittings are used - be careful not to damage the
sealing O-ring, when venting the cylinder.
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ATTENTION! The following venting instructions are for double acting cylinders only. For single acting cylinders, such
as for the boom tilt motion, the venting is easily completed: After service, apply hydraulic pressure to the cylinder,
retract and extend the piston approximately 5 times, and the air is then removed from the system automatically.
Venting Sequence
Follow this sequence to complete an efficient venting of air in the system.
1. Boom centre: Vent cylinders for inner wings.
2. Boom wings: Vent cylinders for 1st outer wing.
3. Boom wings: Vent cylinders for 2nd outer wing, if applicable.
4. Boom centre: Vent cylinder for slant motion.
Venting Procedure
Follow these steps to complete the venting. Begin with both valves/venting screws (A) and (B) closed.
1. Retract the cylinder piston.
2. Remove the dust caps from the venting valves.
3. Fit a clear 5 mm hose to the venting valve (A) and lead it into a
suitable container.
4. Open the venting valve (A).
5. Activate the hydraulic oil pressure and fully extend the piston.
6. Close the venting valve (A) and remove the hose.
7. Fit the clear hose to the other venting valve (B).
8. Open the venting valve (B).
9. Activate the hydraulic oil pressure and fully retract the piston.
10. Close the venting valve (B) and remove the hose.
11. Repeat steps 3 - 10 a few times until air is no longer visible in the hose.
12. Refit the dust caps. Venting completed for this cylinder.
13. Check your hydraulic oil level - top up if needed.
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DANGER! Be careful when operating the cylinders. Make sure unauthorized persons are not in the working area, when
folding or unfolding the boom! When retracting the pistons into the cylinders, keep fingers, tools and clothes away
from the piston. Risk of being trapped between moving boom parts or folded boom sections, resulting in severe
injuries or death.
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ATTENTION! Depending on the boom design, it might be more practical to begin with the cylinder extended.
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ATTENTION! A helping hand is useful to complete the venting procedure.
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