2016-2020 X2 Damping Adjuster Cartridge Assembly Removal/Installation
WARNING: FOX products should be serviced by a trained bicycle service technician, in accordance with FOX specifications. If you have any doubt whether or not you can properly service your FOX product, then DO NOT attempt it. Improperly serviced products can fail, causing the rider to lose control resulting in SERIOUS INJURY OR DEATH.
WARNING: FOX suspension products contain pressurized nitrogen, air, oil, or all 3. Suspension misuse can cause property damage, SERIOUS INJURY OR DEATH. DO NOT puncture, incinerate or crush any portion of a FOX suspension product. DO NOT attempt to disassemble any portion of a FOX suspension product, unless expressly instructed to do so by the applicable FOX technical documentation, and then ONLY while strictly adhering to all FOX instructions and warnings in that instance.
WARNING: Modification, improper service, or use of aftermarket replacement parts with FOX forks and shocks may cause the product to malfunction, resulting in SERIOUS INJURY OR DEATH. DO NOT modify any part of a fork or shock, including the fork brace (lower leg cross brace), crown, steerer, upper and lower leg tubes, or internal parts, except as instructed herein. Any unauthorized modification may void the warranty, and may cause failure or the fork or shock, resulting in SERIOUS INJURY OR DEATH.
The Damping Adjuster Cartridge Assemblies should be considered non-rebuildable as they are difficult to dissassemble and reassemble. The Damping Adjuster Cartridge Assemblies do not need to be removed from the shock to perform a full rebuild. If damaged, please replace as complete assemblies.
X2 Damping Adjuster Cartridge Assemblies should be removed and replaced one at a time on complete shocks to prevent needing a vacuum bleed. The procedure below shows the removal and installation of one Damping Adjuster Cartridge Assembly. If needing to access both rebound and compression assemblies, do not have both adjusters out at the same time. Remove and replace one, then repeat for the other assembly.
The following procedure guides you through removal and installation of X2 Damping Adjuster Cartridge Assemblies in complete FLOAT X2 and DHX2 shocks.
Complete and bled FLOAT X2 and DHX2 shocks can have their Damping Adjuster Cartridge Assemblies removed and reinstalled without performing a full rebuild or vacuum bleed.
X2 Damping Adjuster Cartridge Assemblies can also be removed and replaced during a full rebuild if desired. For full rebuild instructions please go to:
Complete part information and technical drawings for FLOAT X2 shocks can be found by clicking: FLOAT X2 Part Information »
Complete part information and technical drawings for the DHX2 shocks can be found by clicking: DHX2 Part Information »
For information regarding the X2 2-Position Lever please go to: FLOAT X2 and DHX2 2-Position Lever Upgrade »
Make sure FLOAT X2 and DHX2 shocks are fully extended. Do not release air pressure from the main air chamber of the FLOAT X2 shock.
Clamp the FLOAT X2 or DHX2 shock in your soft-jawed vice and unthread (counter-clockwise) the reservoir end cap assembly from the reservoir with a 6mm hex wrench. Release the nitrogen charge by depressing the Schrader valve within the reservoir.
Clamp the non-adjuster eyelet in your soft-jawed vice so the shock sits horizontal and the Damping Adjuster Cartridge Assemblies are facing up and level.
Use the Adjuster Cartridge tool (PN: 398-00-417) to unthread one adjuster counter-clockwise. Remove the Adjuster Cartridge Assembly, High Speed Spring, and Poppet assembly.
WARNING: X2 Valve Seat Assemblies are left-hand threaded. Remove by turning clockwise. Install by turning counter-clockwise. Improper removal or installation can cause part failure, causing the rider to lose control resulting in SERIOUS INJURY OR DEATH.
The Valve Seat Assemblies do not need to be removed to remove and install the X2 Damping Adjuster Cartridge Assemblies.
Valve Seat Assemblies are left-hand threaded and will be removed by turning clockwise. Install by threading in counter-clockwise and tighten to 80 in-lb (9.0 Nm).
All Compression Valve Seats and DHX2 Rebound Valve Seats are identical assemblies (PN: 815-02-046-KIT) and can be removed and installed with a 14mm hex wrench. FLOAT X2 Rebound Valve Seat assemblies are unique (PN: 815-02-054-KIT) and require the X2 Rebound Base Piston tool (PN: 398-00-680).
For best results, FOX recommends vacuuming X2 Damping Adjuster Cartridge Assemblies in an oil bath to purge any trapped air from within the cartridge. A clear syringe with a removable plunger is needed for these steps.
If the syringe is unavailable to you, skip to step 10. X2 Damping Adjuster Cartridge Assemblies may be installed without first being purged of air, but a vacuum bleed should be performed on the shock as described in the full rebuild procedure:
Drop the complete X2 Damping Adjuster Cartridge Assembly into the empty syringe, then insert the plunger and seal the syringe. Draw 10wt. red oil into the syringe and purge out any excess air until the Damping Adjuster Cartridge Assembly is completely submerged.
Cover the open tip of the syringe with a gloved finger, then pull the plunger to create a vacuum within the syringe. Make sure the Damping Adjuster Cartridge Assembly remains submerged in oil as you see bubbles escaping from the assembly.
When bubbles have stopped escaping from the assembly, release the plunger. Remove the syringe plunger while keeping the assembly submerged. Pour the assembly out into a container of oil.
Top off the eyelet opening with FOX 10wt. red oil. Make sure the High Speed Spring and Poppet Assemblies are assembled onto the Damping Adjuster Cartridge Assembly, then drop them into the eyelet and thread in clockwise. Tighten to 80 in-lb (9.0 Nm).
For DHX2 shocks fill the IFP chamber to 150 psi (10.3 bar) with your shock pump.
For FLOAT X2 shocks fill the IFP chamber to 125 psi (8.6 bar) with your shock pump.
Install the reservoir end cap, tightening to 30 in-lb (3.4 Nm) with your 6mm hex wrench.
Dyno test all functions of the shock to verify proper performance. Perform a vacuum bleed if necessary by following the steps in the full rebuild procedure available here:
Clean the exterior of your shock.