CogLock essentials:
Operating and Maintenance Guides

Explainer Video

This video explains how to operate and maintain the CogLock® product.

Operating Instructions

  1. To unlock and remove the CogLock® wheel nut, insert a slotted screwdriver into the yellow locking pin.
  2. Push fully in, turn 110 degrees to the left and release.
  3. The locking pin and spring can now be removed from the end of the bolt.
  4. The wheel nut can be removed.
  5. Wheel nuts must be checked for condition, threads and grooves cleaned proir to refitting.
  6. The wheel bolt threads must be cleaned and checked prior to refitting the wheel nuts.
  7. To refit the CogLock® wheel nut, carry out the above steps in reverse, observing manufacturer recommendations for tightening torques.

    The CogLock® centre pin and bolt drilling should be checked, cleaned, and lubricated prior to refitting. If there are any signs of wear to the locking pin, this should be replaced.

    CogLock® recommend replacing the centre locking pin and spring each time it is removed. These can be purchased on our online shop. 

    CogLock® recommend the use of the Norbar EBT-CA cordless torque tool to ensure the most accurate tightening torque is applied.

Should the centre pin fully retract, and the red collar be visible when the locking pin is aligned in the Safe Operating Position, the grooves in the wheel nut are aligned with the locking assembly. Unlock the pin by following steps 1 to 3 and increase the tightening torque by a maximum of 5% of the required tightening torque, for example for a wheel torque setting of 650nm, the torque can be increased up to an additional 32nm. This is to ensure the grooves are no longer aligned with the locking assembly. The centre pin can now be refitted into safe operating position.

If the CogLock® wheel nut is turned using force without unlocking the centre pin, it is designed to be the weakest point, meaning it is still possible to remove and refit the wheel nut however, the locking system will no longer work. The vehicle must be taken to a place of repair at the earliest opportunity to be repaired. CogLock® wheel stud may no longer be operational and may not lock in place when damaged.

Maintenance Instructions

To ensure the longevity and safe operation of CogLock® wheel security products, it is vital that regular maintenance and safety checks are carried out. During routine maintenance, technicians must:

These maintenance instructions are for CogLock® integral locking device only. The wheel studs and nuts should still be inspected as per manufacturer and DVSA guidance.

  • Check for cleanliness of the centre pin and clean off any excess dirt.
  • Push each CogLock® locking pin inwards to ensure that the pin is not seized, and the spring is operational.
  • Should the pin be seized, it should be cleaned, lubricated, and worked in and out until the pin is moving freely, returning to the safe operating position each time.
  • If you are not able to free the centre pin, it can be drilled out and replaced. If you are unable to remove the centre locking pin, the CogLock® stud must be replaced.
  • The operation of the CogLock® locking mechanism should be checked every time a wheel nut is removed to ensure the correct operation of the product.
  • To carry out an audit check to confirm the correct minimum tightening torque is applied during routine maintenance, the centre locking pin does not need to be unlocked, as the wheel nut should not turn if at the correct minimum value

    If the wheel nut is found to be loose the centre pin should be unlocked and removed, and the correct tightening torque applied to the wheel nut. The centre locking pin can now be refitted. 

    CogLock® recommend the use of the Norbar EBT-CA cordless torque tool to ensure the most accurate tightening torque is applied.

Installation Instructions

To ensure the correct installation of CogLock® to your vehicle and prevent component damage it is important to follow these steps when removing and installing CogLock®.

The safe operation and warranty of CogLock® could be void should these best practices not be followed. For technical guidance or support, please contact our team who will be happy to help.

CogLock® recommends a using a hydraulic pressing tool to remove and install the wheel bolts to prevent excessive vibration. This prevents any damage to components within CogLock wheel bolt which could cause premature failure of the product and warranty implications.

CogLock® also recommend the use of the Norbar EBT-CA cordless torque tool to ensure the most accurate tightening torque is applied.

Removal of CogLock® wheel studs:
  • Follow the Operating Instructions to remove all wheel nuts and remove the wheel.
  • Press the wheel bolt out of the hub using a hydraulic pressing tool. 
  • If removing using impact, the wheel nut must be screwed back onto the wheel stud by 3-5 threads so that the end of the bolt is not exposed to impact force when removing the stud. This is to prevent damage to the end of the stud which could prevent the locking pin from retracting. The centre locking pin must also be refitted.

    Use a soft hammer (copper / hide / plastic), beat the CogLock® out of the wheel hub.

    Remove the wheel nut to allow the CogLock® stud to be fully removed.

    Please note, warranty may be void if it is found that wheel bolts have been fitted / removed by use of impact.
Installation of CogLock® wheel studs
If you are refitting a CogLock® wheel stud that has already been removed, all components must be checked and confirmed as serviceable, cleaned, and lubricated prior to refitting.
  • Position the CogLock wheel bolt into the hub with the centre locking pin in the locked position.
  • Press the wheel bolt fully into the hub using a hydraulic pressing tool. 
  • Remove the centre locking pin by inserting a slotted screwdriver, push in, turn fully to the left and release, removing the pin and spring from the end of the bolt.
  • When the Coglock wheel bolts are pressed into place, the wheels can be refitted by following the operating instructions.
  • It is vital that genuine CogLock parts are used ensure the correct operation of the locking mechanism.

    Please note, warranty may be void if it is found that wheel bolts have been fitted / removed by use of impact.
CogLock® Ltd are not responsible for any wheel loss / wheel nut loosening, or any consequential damage caused by loosening of wheel nuts, or wheel loss, and all responsibility is of the operator. The use of CogLock® should not supersede any best working practices given by regulatory bodies / manufactures, wheel security procedures, physical checks, etc. It is designed as an aid, and should be used alongside all of the previously mentioned best working practices. CogLock® Ltd will not be liable / held responsible for wheel loss. CogLock® is designed to be an aid, and no guarantee is given by CogLock® Ltd that a wheel will never come off.