Fitting and removing tyres
An agricultural tire must be dismounted and mounted by a trained, qualified professional, using the appropriate tools and procedures.
If these operations are handled by several people, make sure that one person at least is present during all operations.
Use a compressed air circuit equipped with a correctly adjusted pressure gauge.
Not following these instructions and procedures may cause incorrect mounting of the tire onto the rim and could also cause the tire to burst, leading to a risk of serious injury or fatality.
1- Removing the tire rim
- Do not try to dismount the tire while the tire is inflated.
- Required : remove the valve core.
- Ensure that the tire is fully deflated before starting to remove it
- Never use a tool liable to damage the tire sidewalls or beads
- Unseat the beads starting from the removal notches when present on the tire
- Lubricate the rim flange and tire beads to facilitate removal and avoid damage to the seats, especially when a puncture is involved
- If the rim shows apparent signs of damage, deflation is required prior to removal of the wheel/tire assembly.
2- Preparing for mounting
- Before mounting, make sure the rim, tire and inner tube are compatible. Check that:
- the tire is suitable for the machine
- the diameter at the “seat" of the rim corresponds to the diameter at the “seat" of the tire to be fitted (example: a 18.4 R 30 tire, Rim: DW16L x 30)
this tire may be fitted onto this rim. (hypertext link to the rim/valve table)
there are rims in existence with seat diameters of 15.3” – never fit. 15” tires to these rims. The same applies to 16.1” and 16.5” diameter rims – never fit 16” tires to these rims.
Before mounting a tire onto a rim that has already been used:
The rim must be clean and show no signs of damage. If the rim is not clean, use a metal brush to clean it. Never mount a tire to a cracked, deformed rim showing signs of breaking or traces of welded repairs...
- If the tire has been used, closely examine it, inside and out, to identify any damage that may need to be repaired before mounting. If it shows signs of deterioration or degradation considered non-reparable by a specialist, replace the tire.
- When fitting with an inner tube, always use a new inner tube suitable for the size of the tire (inner tubes are marked with the sizes of compatible tires). Do not fit an inner tube onto a damaged or repaired rim or one with irregularities. To fit a Tubeless tire without an inner tube onto a Tubeless rim, ensure a new Tubeless valve is inserted each time.
Use tools that are in good condition – ones that are clean, not sharp and suitable for the tires and rims (bead-breakers, levers, machines, etc.).
For wide or large volume tires it is preferable to use an automated bead pusher or a bead breaker (appropriate mechanical assistance) to fit the second bead.
Before fitting, lubricate the rim seats and tire beads. Apply a fine coating of lubricant on the parts indicated in the drawing opposite. On the outside of the beads the lubricant must be applied up to 2 inches higher than the edge of the rim. The inside of the bead should also be lubed to prevent damage.
Only use products suitable for this use that will not damage the tire: hydrocarbon-based products, silicone and antifreeze are not to be used.
3- Mounting the tire onto the vertical wheel
- Position the valve or valve hole at the bottom.
- Position the bead-breaker “window” away from the location of the valve to avoid damaging the bead on the latter.
- Place the tire into the rim so that the first tire bead is positioned on the edge of the rim. If applicable, adhere to the rotation direction indicated on the tire with an arrow.
- Using a suitable lever and with successive touches around every 4-6 inches:
- Bring the first bead over the edge of the rim and push it into the deepest rim well.
- Once the first bead has been inserted:
- fix the valve, tightening the nut lightly
- if an inner tube is being fitted, position the inner tube slightly inflated inside the tire
- For the second bead:
- bring the bead over the edge of the rim and push it into the deepest rim well.
- Finish at the valve.
- Centering the tire, positioning of the tire beads:
- Slightly lower the jack to approach the centering of the tire on the rim
- Remove the valve core
- Inflate slowly and lightly to ensure the beads are in the best possible position,
- When mounting a tire with an inner tube, check that the beads are not pinching it,
- Inflate to 35 psi without exceeding this pressure to ensure the beads are correctly positioned.
4- Inflating and positioning the beads
The safety rules to be applied are:
- Retention system to hold the agricultural tire assembly in place (safety cage)
- A pair of protective goggles
- Safety shoes
- Safety ear muffs
If there is no safety cage or bar, the mechanic should stand as far as possible from the tire and rim as possible.
Note: never stand in the paths indicated (Figures 1, 2, 3) to avoid any risk of physical injury in the event of an accident or incident.
To work in complete safety, use an inflation gun with a calibrated pressure gauge, connected to the valve by an air extension tube at least 10 feet long, equipped with a clip system on the valve side and in perfect working order –never block the handle.
Above all, check:
- that the beads are correctly in position, centered in relation to the edges of the rim. Inflate up to 35 psi without exceeding this pressure.
- If the beads are not correctly positioned:
- deflate, lubricate again and inflate to a pressure of 35 psi
- repeat these operations until the beads are correctly in place
- replace the valve core
- tighten the valve nut by hand
- inflate to the operating pressure determined, according to the load scales indicated in the manufacturer’s documentation or to the storage pressure
- screw on the valve cap whenever a tire has been inflated or the pressure checked because this part alone keeps the valve clean and airtight
In the event of a tire being mounted flat on the ground – a method not recommended by Michelin because it is impossible to see the positioning of the lower bead, make certain that:
- A maximum pressure of 10 psi is not initially exceeded (to make a seal);
- The tire/rim assembly is raised, placed in a safety cage or, failing this, with the top part leaning against a wall, never against a door or light partition;
- The inflation instructions relative to vertical fitting are observed (Figures 1, 2 and 3).
All radial tires used at low pressure must be mounted onto good quality rims.
5- Putting into operation
- When machines are being transported (by road, rail or ship), we recommend agricultural tires be inflated to 26 psi to avoid any possible damage from certain anchorage systems.
- When the machine is put into service, the pressure must be determined and adjusted according to the load supported by the tires and actual conditions of use.