2025 Transfer 125 Hour Intermediate Service (Common shop tools only)
Required Parts
- 803-04-122 Seal Kit: 2025 Transfer Seatpost, 30.9/31.6, Intermediate Service
- 803-04-123 Seal Kit: 2025 Transfer Seatpost, 34.9, Intermediate Service
Required Tools
Sections
WARNING: Always wear safety glasses and protective gloves during service to prevent potential injury. Failure to wear protective equipment during service may lead to SERIOUS INJURY OR DEATH.
WARNING: FOX products should be serviced by a qualified 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: Modification, improper service, or use of aftermarket replacement parts with FOX forks, shocks, and seatposts may cause the product to malfunction, resulting in SERIOUS INJURY OR DEATH. DO NOT modify any part of a fork, shock, or seatpost 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.
WARNING: FOX products contain pressurized nitrogen, air, oil, or all 3. Misuse can cause property damage, SERIOUS INJURY OR DEATH. DO NOT puncture, incinerate or crush any portion of a FOX product. DO NOT attempt to disassemble any portion of a FOX product, unless expressly instructed to do so by the applicable FOX technical documentation, and then ONLY while strictly adhering to all FOX insturctions and warnings in that instance.
IFP Information: IFP Pressure: 275-325Psi.
**This 125 hour intermediate seatpost service can be performed with common workshop tools, however, while not required, FOX has developed specific tooling for this seatpost. Please see the listings below for tool details.**
398-01-163 | Tooling: 2025, Transfer, Wiper Install Tool, 30.9, 31.6 |
398-01-164 | Tooling: 2025, Transfer, Wiper Install Tool, 34.9 |
Disassembly
![img/help/page2991-FY7M/IMG_8516 copy-m.jpg](img/help/page2991-FY7M/IMG_8516 copy-m.jpg)
Step 1
Remove the Saddle Clamps and hardware. Turn the 4mm hex bolts counter-clockwise to remove them from the Saddle Clamp Nuts. Set all clamps and hardware aside.
![img/help/page2991-FY7M/IMG_8531 copy-m.jpg](img/help/page2991-FY7M/IMG_8531 copy-m.jpg)
Step 2
Clean your bike work stand clamps and the exterior of the seatpost to prevent damage during clamping. Clamp the seatpost in your workstand, then unthread the Lower Post Collar by turning it counter-clockwise by hand. If too tight to unthread by hand, you may use channel lock type pliers with a shop rag to protect the collar from damage. Remove the o-ring under the collar.
![img/help/page2991-FY7M/IMG_8546 copy-m.jpg](img/help/page2991-FY7M/IMG_8546 copy-m.jpg)
Step 4
Separate the Upper Post Assembly from the Lower Post. Take note of the position of the ball bearing in the base lug and mark the anti-rotation hole that the ball bearing was found in. This is in case the ball falls out during service.
If you use a Sharpie or other marker to make this mark, take care not to remove the mark as you clean parts throughout the rebuild. A scribed line is also an option for marking the position of the ball bearing.
Remove the keys and index pins.
![img/help/page2991-FY7M/IMG_8562 copy-m.jpg](img/help/page2991-FY7M/IMG_8562 copy-m.jpg)
Step 5
Clamp the Upper Post Assembly in your bike stand. Remove the Pushrod from the bottom of the Shaft. Using a T25 torx to hold the Shaft in place, unthread the Base Lug counter-clockwise from the Shaft using a 10mm wrench.
![img/help/page2991-FY7M/IMG_8559 copy-m.jpg](img/help/page2991-FY7M/IMG_8559 copy-m.jpg)
Step 6
Remove the Lower Bushing followed by the Lower Bushing energizer o-ring, Top Out Washer, and Collar assy.
![img/help/page2991-FY7M/AAwiper1-m.jpg](img/help/page2991-FY7M/AAwiper1-m.jpg)
Step 7
To replace the Dust Wiper use a flat screwdriver with a twisting motion to lift up on the Wiper.
![img/help/page2991-FY7M/IMG_9685-m.jpg](img/help/page2991-FY7M/IMG_9685-m.jpg)
Step 8
Setting the Collar Assembly against a table, use a pick to remove the retaining ring that sits between the Bushing Carrier and Collar.
Reassembly
![img/help/page2991-FY7M/IMG_8587 copy-m.jpg](img/help/page2991-FY7M/IMG_8587 copy-m.jpg)
Step 1
Install Upper Bushing Carrier Assembly from kit into your Post Collar. Hold Collar against a flat surface and reinstall your reatining ring.
![img/help/page2991-FY7M/IMG_8860 copy-m.jpg](img/help/page2991-FY7M/IMG_8860 copy-m.jpg)
Step 2
Install new wiper seal/anti-rattle ring assembly from the kit. Bend old Lower Bushing so it fits around Wiper and use a soft jaw vise to press Wiper Seal into Collar Assembly. The top of the wiper flange must sit flush with the top of the collar.
![img/help/page2991-FY7M/IMG_9700-m.jpg](img/help/page2991-FY7M/IMG_9700-m.jpg)
Step 3
Pack the new wiper with Slick Honey, then reinstall Collar Assembly onto Upper Post, followed by Top Out Washer
![img/help/page2991-FY7M/IMG_9730-m.jpg](img/help/page2991-FY7M/IMG_9730-m.jpg)
Step 4
Install new greased Lower Bushing Energizer O-Ring and new Lower Bushing from kit. Orient Bushing split to side of the post.
![img/help/page2991-FY7M/IMG_8523 copy-m-m.jpg](img/help/page2991-FY7M/IMG_8523 copy-m-m.jpg)
Step 5
Remove the black air cap at the top of the post by turning it counter-clockwise with a 10mm socket. Charge the post to 275-325psi. Reinstall the Air Valve Cap finger tight with a 10mm socket.
![img/help/page2991-FY7M/AIMG_8737 copy-m-m.jpg](img/help/page2991-FY7M/AIMG_8737 copy-m-m.jpg)
Step 6
Reinstall the Base Lug, threading it clockwise onto the shaft. Hold the Base Lug in place with your 10mm wrench while you tighten the shaft COUNTER-CLOCKWISE into the Base Lug, tightening (counter-clockwise) to 30in-lb (3.4Nm) torque. Reinstall the Push rod after torque.
![img/help/page2991-FY7M/IMG_8827 copy-m.jpg](img/help/page2991-FY7M/IMG_8827 copy-m.jpg)
Step 7
Coat the entire upper post below the collar and the top 2.5" of the inside of the lower post with a thick (clump-level) film of Slick Honey. Install the Index Pins and Travel Adjust Keys.
![img/help/page2991-FY7M/base lug ball alignment-m.jpg](img/help/page2991-FY7M/base lug ball alignment-m.jpg)
Step 8
Rotate the base lug so that the ball aligns with the back index pin.
Align the ball bearing with the groove in the inside of the Lower Post that is closest to the laser etching on the back of the Lower Post. Align the back of the upper post (higher of the two saddle mounting tabs) with the laser-etching on the back of the lower post. Slowly feed the Upper Post Assembly into the Lower Post.
Note: Increased force may be required to install the upper post into the lower post as the lower bushing is energized by the o-ring.
![img/help/page2991-FY7M/IMG_8837 copy-m.jpg](img/help/page2991-FY7M/IMG_8837 copy-m.jpg)
Step 9
Thread the Actuator into the end of the Lower Post. Tighten the Bottom Cap clockwise using its thickest part to 40 in-lb (4.5 Nm) torque.
![img/help/page2991-FY7M/IMG_8834 copy-m.jpg](img/help/page2991-FY7M/IMG_8834 copy-m.jpg)
Step 10
Install the Lower Post Collar tightening clockwise until hand tight. Reinstall the Lower Post Collar O-ring.
![img/help/page2991-FY7M/IMG_8520.2 copy-m.jpg](img/help/page2991-FY7M/IMG_8520.2 copy-m.jpg)
Step 11
Reinstall the Saddle Clamps making sure all arrows face the front of the post. Clean the exterior of your post with Isopropyl alcohol.