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Summary of Contents for Trek 31.6
- Page 1 31.6 & 34.9 GEN 3 LINE DROPPER SEATPOST SERVICE MANUAL August 2024...
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Page 2: Table Of Contents
31.6 and 34.9 Dropper Post Service Manual Contents Parts list Install the travel reducer Service the dropper post Replace the cartridge Install the dropper post 9-10 Troubleshooting Measurements diagram About this manual Clamping in a repair stand Legend Only clamp the dropper post in the upper part of the lower tube in a repair stand. -
Page 3: Parts List
31.6 and 34.9 Dropper Post Service Manual Parts list 31.6 34.9 T-nuts Upper saddle plate 5316446 5316446 Spring Lower saddle plate Saddle rail bolts 10Nm Cartridge bolt (M6) W5284053 W5284053 Seatpost Upper bushing Lower bushing 5316593 5316453 Lower bushing O-ring... -
Page 4: Install The Travel Reducer
31.6 and 34.9 Dropper Post Service Manual Install the travel reducer (optional) There are two travel reducers available — 30mm and 10mm. A travel reducer raises the lowest point the seatpost will reach. NOTE: Travel reducers are not stackable and you cannot replace them with a headset spacer. -
Page 5: Service The Dropper Post
31.6 and 34.9 Dropper Post Service Manual Service the dropper post Clean and regrease — clean and regrease sliding surfaces Remove the actuator housing. at least twice a year. TIP: Wear gloves to grip the lower tube better. Full service — replace the parts shown below at least once every two years (more frequently with heavier use). - Page 6 31.6 and 34.9 Dropper Post Service Manual Service the dropper post (continued) Loosen the lockring collar and remove the lower tube. (FULL SERVICE ONLY) Remove the dust seal as follows. Slide the lockring collar to the lowest end of the seatpost and thread it onto the lower tube.
- Page 7 31.6 and 34.9 Dropper Post Service Manual Service the dropper post (continued) 10. (FULL SERVICE ONLY) Insert the seatpost with the 12. Grease the seatpost and lower tube sliding surfaces dust seal into the lockring collar on the lower tube.
- Page 8 31.6 and 34.9 Dropper Post Service Manual Service the dropper post (continued) 13. Slide the seatpost into the lower tube — with the QR 15. Insert the cartridge and align the D shape inside the code facing backwards — through the three key hole seatpost.
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Page 9: Replace The Cartridge
31.6 and 34.9 Dropper Post Service Manual Replace the cartridge Over time, the cartridge will lose its stability and you will need to replace it. Follow steps 1-4 in the Service the dropper post section to remove the cartridge. Reinstall the cartridge following steps 15-19 in the Service the dropper post section. -
Page 10: Install The Dropper Post
31.6 and 34.9 Dropper Post Service Manual Install the dropper post The procedure below shows how to route and install the Feed the cable through the housing back-to-front. dropper post in an internally routed frame. The route of the Attach the cable and housing to the actuator. - Page 11 31.6 and 34.9 Dropper Post Service Manual Install the dropper post (continued) Turn the handlebar all the way to the non-drive side and hold the housing where it will attach to the lever. Mark your cut line — make sure you provide enough slack.
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Page 12: Troubleshooting
31.6 and 34.9 Dropper Post Service Manual Troubleshooting ISSUE: Pressing the lever does not lower the dropper post. SOLUTION #1: Turn the barrel adjuster on the lever counterclockwise to increase cable tension. SOLUTION #2: Replace the cable and housing (see Install the dropper post). -
Page 13: Measurements Diagram
31.6 and 34.9 Dropper Post Service Manual Measurements diagram The measurements below apply to the 31.6 and the 34.9 dropper posts. All measurements below are in millimeters (mm). Height at max Minimum Travel Total length Max insertion Max extension Actuator length...
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