WORKSHOP PROCEDURES FOR S FITTED WITH LARGE GROMMET, HYBRID SMALL GROMMET OR SMALL GROMMET SEALS LARGE GROMMET HYBRID SMALL GROMMET SMALL GROMMET SMALL GROMMET Doc N o. 90580022 ECN 1239 1/7
This document details the workshop procedures for dismounting and mounting Schrader Electronics GEN2 and GEN3 TPMS transmitters fitted with a Hybrid Small Grommet (HSG) seal, a Large Grommet seal or a Small Grommet seal. This document also covers Schrader Electronics GENJ TPMS transmitter which is fitted with Small Grommet. Small Grommet procedures should be followed if mounting and dismounting GENJ.! NOTE: there is a separate workshop fitment procedures contained in Schrader Electronics document no. 90580022 for GEN2 transmitters fitted with a Conical seal. ENCLOSURE VALVE SEAL CAP GEN2 TPMS TRANSMITTER WHAT NOT TO DO DURING ASSEMBLY Never fit a damaged transmitter or seal to a wheel rim. Do not fit the tyre to the rim unless confident that the valve and seal have been fitted correctly. Never interchange seal types or nuts between transmitters. Never re-use an old seal. Always ensure that a new Schrader seal is fitted to the transmitter. Never fit a transmitter to unapproved wheel rims. STORAGE CONDITIONS Transmitters should be stored in a dry ambient environment, avoiding damp conditions and extreme temperature exposure. Typical storage temperatures are 0 to 40 C, short term exposure outside these limits is permitted. The shelf life of the transmitter is 10 years from date of shipping. However the shelf life of the seal is 12 months from date of shipping. Seals that are aged more than 12 months from shipping date should not be used. If a seal is found to be more than 12 months old, then it should be removed from the transmitter and replaced in accordance with the workshop procedures detailed in this document. The shipping date will be given on the label of the Schrader shipping box. Doc N o. 90580022 ECN 1239 2/7
DISMOUNTING PROCEDURES 1 Remove cap and valve core and deflate the tyre. Dispose of both core and cap. 2 Unscrew the nut and allow the sensor to fall free into the wheel. Dispose of the nut. 3 Gently bounce the tyre to ensure that 4 Place wheel on the tyre changing transmitter falls to the bottom of the tyre. machine and break both beads. Ensure transmitter is at bottom. 5 Remove top and bottom tyre beads. The 6 Recover the TPMS transmitter from the position of the valve hole relative to the wheel. tyre changing head is not important. Doc N o. 90580022 ECN 1239 3/7
7 The seal MUST be removed. The seal 8 The new seal can be put on by hand. can be pulled off by hand. Ensure correct service pack is used for specific transmitter. 9 Service items for transmitters may be supplied individually or in service packs. A typical service pack contains a seal, core, cap and nut. Replace these items with every tyre service.! Ensure that the correct service pack is used for the specific transmitter. Doc N o. 90580022 ECN 1239 4/7
MOUNTING PROCEDURES 1 Place the valve in front of the hole. 2 The seal must be positioned centrally to Ensure the valve is inserted centrally to the valve hole. Ensure the seal lip is not the valve hole. trapped during insertion. Push the rear of the enclosure Hand tighten a NEW nut until it touches For transmitters fitted with Hybrid 3 the rim Small Grommet seals ONLY, use a calibrated torque wrench set at 8±0.5Nm. 4! 5! For transmitters fitted with Large Grommet or Small Grommet seals ONLY, use a calibrated torque wrench set at 5±0.5Nm. 6 Hold the transmitter in the valve hole while torquing. Slowly torque until the wrench reaches relevant setting (8Nm or 5Nm). 5Nm Doc N o. 90580022 ECN 1239 5/7
7 Do not push the top of the enclosure 8 Do not lift the enclosure whilst torquing whilst torquing the nut. the nut. 9 A correctly positioned transmitter looks 10 Apply tyre soap to both tyre beads. like this when fitted. 11 Fit the bottom tyre bead. Ensure that the 11 Once the bottom bead is on the wheel, sensor is positioned at 3 o clock relative reposition the wheel such that the sensor to the tyre changing head. Wheel rim is traveling clockwise. is 5cm (2 ) in front of where the tyre bead crosses over the rim. Doc N o. 90580022 ECN 1239 6/7
12 Inflate tyre until it passes both bead Inflate tyre as per placard plate or humps. Fit the valve core to valve stem. manufacturers recommendation, or until both beads are seated. 13 Plain Brass Core Electroless Nickel Plated Core You must always put in a new electroless nickel-plated valve core. Electroless nickelplated valve cores must be used with the aluminium valve stem. Failure to use electroless nickel-plated cores will result in galvanic corrosion and eventual loss of tyre pressure. Tighten core with an approved core tool to 0.17-0.37Nm. DO NOT OVERTIGHTEN Doc N o. 90580022 ECN 1239 7/7