Structure And Working Principles Of Rear Fork; Demolition And Maintenance Of Rear Fork; Maintenance Of Rear Fork; Section 10 Rear Fork - ZONGSHEN ZS125-80 Service Manual

The rear fork of the motorcycle connects the rear wheel with the main frame, and enables the rear
wheel to move up and down in a certain range around a fixed point on the frame through the rear damper
to withstand the impact and vibration suffered by the rear wheel.

1. Structure and Working Principles of Rear Fork

Subject to big impact and vibration from the
rear wheel, the rear fork requires high intensity and
rigidity in respect of material selection and jointing.
Processes include jointing, riveting, etc. The rear
fork assembly mainly includes a rear fork, dust
seal, dustproof sealed cap, and fork shaft sleeve,
etc.
In order to ensure that the rear fork can move
up and down around a fixed center, joints of the
rear fork and vehicle body are equipped with
bushings or bearings. The rear fork makes the rear
wheel more flexible and reliable.

2. Demolition and Maintenance of Rear Fork

[1] Check the rear fork for any deformation or crack
generated due to the impact of external forces.
Check whether the fit clearances of various parts
of the rear fork become larger, and the rear fork
swings too dramatically.
Caution
In any of the above conditions, please replace or
repair the rear fork timely, to ensure the riding
comfort and safety.
3. Refer to Table 4-9 in respect of damage forms, fault phenomena and common
maintenance methods of the rear fork:
Component
Name
Rear Fork
36

Section 10 Rear Fork

Table 4-9: Maintenance of Rear Fork
Component Fault
Damage Form
The rear wheel is The rear fork is bent
impacted. and deformed.
The motorcycle rolls over,
The rear fork breaks.
the rear fork falls and
breaks.
The rear wheel is subject
The rear fork falls off.
to too violent impact and
vibration.
S u b j e c t t o p o o r
road conditions, the The dust seal of rear
motorcycle suffers f o r k s h a f t s l e e v e i s
too violent impact heavily abraded.
and vibration.
Motorcycle Fault
Phenomenon Phenomenon
The front motorcycle
wheel runs off tracking,
affecting the comfort,
stability and security.
The motorcycle cannot
run properly.
Riding comfort, stability
and security decrease.
T h e r e a r f o r k s h a f t
sleeve or bearing is
poorly sealed.
Check the rear fork
Maintenance Method
Rectify or replace the
rear fork.
Joint or replace the
rear fork.
Joint the rear fork.
R e p l a c e t h e d u s t
seal of rear fork shaft
sleeve.