Mounting Tires
- Wheel electronics unit and valve may have been fitted incorrectly.
- Wheel electronics units may not have been assigned correctly.
→ Read and follow the installation instructions for the wheel electronics units. → 443219 REMOVING AND INSTALLING WHEEL ELECTRONICS
→ Check that the wheel electronics units are assigned correctly. Tire Pressure Monitoring (TPM) system not active after changing wheels
Information
- For correct Tire mounting, follow the instructions provided for the Tire removal/mounting machine.
- Always use approved tires and Tire sizes (specification code/speed index/load capacity). This data can be found in the applicable/current Technical Information.
- Tire temperature during removal/mounting must be approx. 20°C (at least 15°C). Allow enough time to heat the vehicle/tires in a suitable environment if necessary (at room temperature of more than 15°C). Example: If the room temperature of the workshop is approx. 20°C and the Tire temperature is approx. - 15°C, approx. 3 hours are required to heat the tires to the required temperature.
- The wheel electronics must not be treated with compressed air, Tire mounting paste, cleaning agents or any other solvents.
- Disc wheels with wheel electronics must not be cleaned with a high-pressure power cleaner before tires have been fitted.
- Do not expose filter surface of wheel electronics. Remove soiling with a lint-free cloth. Do not apply Tire mounting paste to the wheel electronics unit. All traces of Tire mounting paste must be removed from the wheel electronics unit.
- During fitting, ensure that the Tire bead is not pressed against the wheel electronics unit.
- Huge tension can be transferred to the Tire bead when the mounting paste dries quickly. It is therefore absolutely essential to mount the upper and lower Tire bead quickly and without delay.
- Complete preparatory steps for mounting tires:
- Remove abraded rubber particles from the disc wheel and check for damage. → WM 440002 CHECKING DISC WHEELS .
- Fit and clamp the clean wheel as described in the instructions provided for the Tire removal/mounting machine.
- For vehicles with TPM, check the valve and wheel electronics unit for damage. Replace these components if they are damaged or if they do not comply with specifications (special information on TPM).
- Always replace the rubber valve (on vehicles without TPM). Use a commercially available insertion tool and Tire mounting paste.
- If you intend to continue using the Tire, check it for damage (sealing face between Tire/rim, ply damage, Tire beads, sidewalls and tread depth).
- As a general rule, check the bead area (mounting and sealing face) for damage before mounting tires (even new tires). Ensure that this area is perfectly clean to prevent any slow air leaks (loss of Tire pressure) in this area (after mounting the Tire). A loss of Tire pressure often goes unnoticed on vehicles without TPM. Serious consequence: Reduced driving dynamics and the Tire can be damaged irreparably as a result of increased kneading action (overheating) .
- Coat the rim and Tire (both bead areas) with sufficient Tire mounting paste - TIP TOP Universal, Order No. 593 0601 - or Contifix. Absolute cleanliness is essential (clean brush/clean Tire mounting paste). Make sure that there are no traces of Tire mounting paste on the wheel electronics unit.
- Fitting lower Tire bead (first Tire bead).
Place the Tire at the correct position on the disc wheel (check direction of rotation and inside/outside position).
Push in mounting arm and position on top of the rim flange. The mounting head must be offset by 180° with respect to the valve.
Push the lower Tire bead (first Tire bead) partly over the rim flange and guide it through the mounting head, mounting Tire, lower Tire bead, Fig 2. Turn the disc wheel slowly in a clockwise direction (clockwise rotation of mounting table) until the lower Tire bead is completely fitted.
- Fitting upper Tire bead (second Tire bead)
using bead holding-down device. This presses the Tire bead into the deep bed.
Information
- Always use a bead holding-down device for mounting the upper Tire bead (second Tire bead).
- There are two types of bead holding-down devices. These are described in sections 4.1 and 4.2 below.
- Use the Wulstboy bead holding-down device (type 2 in section 4.2) for Tire/wheel combinations that are difficult to mount.
- 4.1. Fitting upper Tire bead (second Tire bead) using bead holding-down device type 1 = special tool 9539
Position the mounting head -1- approx. 15 cm to the right of the valve -2- .
Hold the upper Tire bead (second Tire bead) in the deep bed using the bead holding-down device 9539 and turn the disc wheel slowly at the same time (clockwise rotation of mounting table) until the upper Tire bead is completely fitted.
- 4.2. Fitting upper Tire bead (second Tire bead) using bead holding-down device type 2 = Wulstboy
Position the mounting head approx. 15 cm to the right of the valve.
Use the upper plastic press-off roller (on the mounting machine) to press the upper Tire bead approx. 4 to 5 cm below the rim flange (max. 5 cm/the belt edge of the Tire must not be deformed by the plastic press-off roller). This makes space for the bead holding-down device blocks.
Fit the bead holding-down device (Wulstboy) into the middle of the "wheel/rotary plate" -1- . Move the arm -2- of the bead holding-down device to the 1 o'clock position.
Turn the wheel slowly in a clockwise direction (clockwise rotation) and insert the blocks -3- of the bead holding-down device.
Continue turning the disc wheel slowly (clockwise rotation) until the upper bead is completely fitted.
After fitting the upper Tire bead, loosen the bead holding-down device by turning the disc wheel anti-clockwise (anti-clockwise rotation) and remove the blocks using the upper press-off roller.
- Filling/setting tires.
- 5.1. Remove entire wheel from Tire fitting unit.WARNING: High Tire seating pressure
- Risk of squashing or bruising
→ Use a Tire filling cage.
- 5.2. Fill the Tire (without the valve insert) with air immediately in the Tire filling cage
(while the Tire mounting paste is still fully effective). Continue filling the Tire until the Tire beads slide/jump over the humps (max. 3.3 bar/48 psi).
If the Tire is not seated correctly when the maximum permitted Tire seating pressure (max. 3.3 bar/48 psi) is applied, coat the wheel and Tire again with Tire mounting paste TIP TOP Universal or Contifix and repeat the procedure.
- 5.3. Screw in new valve insert. Counter at the valve body when tightening. Required tightening torque is 0.2 Nm/0.1 ftlb to 0.35 Nm/0.2 ft lbs. (20 to 35 Ncm/1.6 to 3 inlb.). A safety valve screw-on tool with tightening control (e.g. from Butler) is ideal for this.
Fill Tire to the setting pressure of 4.0 bar (58 psi). Check that the Tire bead is seated correctly. The Tire must be lying evenly against the rim all the way around.
Set the prescribed Tire pressure. → WM 4400IN WHEELS AND tires . Screw on valve cap.
- 5.1. Remove entire wheel from Tire fitting unit.
- Balance the wheel → WM 440093 BALANCING/OPTIMISING WHEELS .
- Perform a test drive.
Avoid extreme driving manoeuvres (acceleration, braking) during the test drive to prevent the Tire from turning on the rim.
This can happen if the Tire mounting paste is not completely dry. Optimum balancing will be impaired as a result.
Observe the following criteria during the test drive:
- 7.1. TPM function (Tire Pressure Monitoring system).
Before starting the test drive (with "ignition on"), select the mounted set of wheels under Main menu > Tire pressure > Settings in the instrument cluster. The control unit then learns the wheel positions again while you drive the vehicle.
The system starts learning as soon as you accelerate above 25 km/h (16 mph). The learning time is normally about 30 seconds, but can take several minutes when the vehicle is driven in a metallic environment (e.g. multi-storey car park, bridge and other concrete, highly metallic surfaces).
- 7.2. Rough running performance and vibrations
- 7.3. Vehicle handling.
- 7.1. TPM function (Tire Pressure Monitoring system).