Warning! Do not interchange the stems, they have internal differences. The left cartridge (2) has a slot at the bottom, whereas the right one (1) has a slot at the top.
![](https://motoinstruction.ru/img/aprilia/17/123224.jpg)
Note. The operations described below are valid for both stems.
Drain the fork oil.
Place the fork stem on a work table in upright position.
Fit the special tool.
- Specific tooling: AP8140147 Spacer tool
![](https://motoinstruction.ru/img/aprilia/17/123225.jpg)
With the help of a second operator:
- Hold the sleeve cap firmly.
- Push the special tool down.
- Take out the Seeger ring.
![](https://motoinstruction.ru/img/aprilia/17/123226.jpg)
With the help of a second operator:
Insert the special tool between the nut and the preloading pipe.
- Specific tooling: AP8140148 Spacer-pumping element separating plate
![](https://motoinstruction.ru/img/aprilia/17/123227.jpg)
Loosen the nut.
![](https://motoinstruction.ru/img/aprilia/17/123228.jpg)
Remove the sleeve cap.
![](https://motoinstruction.ru/img/aprilia/17/123229.jpg)
Slide off the preloading pipe together with the spring centring.
![](https://motoinstruction.ru/img/aprilia/17/123230.jpg)
Be careful not to damage the fork stem when placing it in horizontal position in a vice and using the appropriate protections.
- Specific tooling: AP8140149 Protection for fitting operations
![](https://motoinstruction.ru/img/aprilia/17/123231.jpg)
Unscrew and remove the bottom screw and collect the special washer.
![](https://motoinstruction.ru/img/aprilia/17/123232.jpg)
Slide off the pumping member together with the spring.
![](https://motoinstruction.ru/img/aprilia/17/123233.jpg)
Remove the dust guard using a screwdriver as a lever.
![](https://motoinstruction.ru/img/aprilia/17/123234.jpg)
Remove the Seeger ring from inside the sleeve with the aid of a screwdriver.
Caution! Do not damage the stem during the operation.
![](https://motoinstruction.ru/img/aprilia/17/123235.jpg)
Slide off the stem forcefully.
![](https://motoinstruction.ru/img/aprilia/17/123236.jpg)
If necessary, remove the sliding bushing, guide bushing, ring, oil seal, Seeger ring and dust guard from the stem.
![](https://motoinstruction.ru/img/aprilia/17/123237.jpg)
See also specifications for this operation in this chapters: handlebar, front fork, steering.