Husqvarna SM 610 2006, Workshop Manual

Page: 133 / 230

5
F R O N T S U S P E N S IO N
F O R K W O R K IN G
T h e h yd ra u lic s yste m o f th is fo rk re lie s o n m u ltiva lve s; a syste m a lre a d y te ste d
in th e p a st M A G N U M b u t w ith d iffe re n t fe a tu re s a s b o th le g s h a ve th e sa m e
se ttin g . T h e re fo re , e a ch le g re p re se n ts a co m p le te su sp e n sio n syste m to b e
co n sid e re d a s su ch w h e n a d ju stin g . In o rd e r to g ive a b e tte r e xp la n a tio n o n h o w
th e su sp e n sio n s w o rk, th e m o vin g p a rts (d a rk b a ckg ro u n d ), d e p e n d a n t o n th e
w h e e l, a re d iffe re n t fro m th e p a rts fixe d
to th e m o to rb ike fra m e (lig h t b a ck g ro u n d ); a n y o il flo w in g o r m o ve m e n t in th e
d iffe re n t w o rkin g sta g e s is re p re se n te d b y m e a n s o f a rro w s (se e F IG . 1 ). T h e
m o vin g p a rt o f e a ch le g is fo rm e d b y a sta n ch io n (1 ) se cu re d to th e slid e r 2 );
h a vin g in sid e a fo o t va lve (3 ) e q u ip p e d w ith a p isto n (4 ) w ith w a sh e rs a n d a
co m p re sso r scre w a d ju ste r (5 ). T h e ca rtrid g e b o d y (6 ) is se cu re d in sid e th e
sta n ch io n . P a rts fixe d to th e fra m e co n sist o f a n o u te r slid e r (7 ) clo se d a t th e to p
b y th e p lu g (8 ). T h e in n e r p u m p in g e le m e n t (1 0 ) o f th e ca rtrid g e (6 ) is se cu re d
to th e u p p e r p lu g (8 ) o f th e sta n ch io n tu b e b y m e a n s o f a ro d (9 ). A re b o u n d
scre w a d ju ste r (1 1 ) lo ca te d o n th e p lu g o p e ra te s a n in n e r p u sh -ro d (1 2 ) th a t in
tu rn d isp la ce s a co n ica l p in (1 3 ) p la ce d rig h t o n to p o f th e p u m p in g e le m e n t.
T h e lu b rica tio n o f th e slid in g b u sh in g s (1 4 a n d 1 5 ) a n d th e se a l rin g (1 6 ) is
g u a ra n te e d b y th e flu id in to th e ch a m b e r b e tw e e n th e sta n ch io n tu b e (1 ) a n d
th e slid e r (7 ). T h e o il flo w s in to th is ch a m b e r th ro u g h tw o b ig h o le s o n th e
sta n ch io n to p (1 ), ju st u n d e r th e b u sh in g (1 5 ). T u rn th e scre w a d ju ste rs (5 a n d
1 1 ) to se t th e flu id flo w in g o u tle t, in th is w a y th e su sp e n sio n re sp o n se d u rin g
co m p re ssio n a n d /o r re b o u n d ca n b e ch a n g e d . E a c h a d ju stm e n t w ill click in
p o sitio n . A lw a ys sta rt w ith m a x. d a m p in g p o sitio n (a d ju ste r co m p le te ly scre w e d
clo ckw ise ) fo r a n y a d ju stm e n ts. S m a ll d a m p in g in cre m e n ts w ill p ro d u ce b ig
e ffe cts if m a d e in b o th fo rk le g s.
L e t s se e w h a t h a p p e n s in e a ch le g d u rin g C O M P R E S S IO N (se e F IG . 2 ).
T h e o il in to th e ca rtrid g e is co m p re sse d b y th e m o ve m e n t o f th e p u m p in g
e le m e n t (1 0 ) a n d ca n flo w o n ly th ro u g h th e h o le s in th e p isto n (4 ) a n d th e
m id d le g ro o ve o f th e fo o t va lve (3 ). T h is p a ssa g e is a d ju ste d b y th e a ctio n o f th e
w a sh e rs (A ), u n d e r th e p isto n , a n d th e p o sitio n o f th e co n ica l p in o f th e scre w
a d ju ste r (5 ). In o rd e r ch a n g e th e fo rk d a m p in g a t th is sta g e , a p a rt fro m tu rn in g
th e scre w a d ju ste r (5 ), a lso ch a n g e th e w a sh e r se ttin g (A ) b y u sin g w a sh e rs o f
d iffe re n t th ickn e ss a n d d ia m e te r a m o n g th e a va ila b le o n e s. In th is p h a se , so m e
o il, flo w in g th ro u g h th e o p e n ch a n n e ls o f th e p u m p in g e le m e n t (1 0 ) w in s o ve r
th e a ctio n o f th e u p p e r re tu rn sp rin g (1 7 ) a n d , liftin g th e w a sh e r (1 8 ),
co m p e n sa te s th e in le t vo lu m e in th e ca rtrid g e . T h e o il co m in g o u t o f th e
ca rtrid g e th e n flo w s in to a n o u te r ch a m b e r co m m u n ica tin g w ith th e
d e p re ssu rize d le g to p (se e F IG .3 A ).
T h e ch a m b e r a n d th e le g to p a re lin ke d to g e th e r th a n ks to th e p a ssa g e a re a s
b e tw e e n b o d y p lu g (1 9 ) a n d sta n ch io n (1 ) a n d fo u r b ig h o le s o n th e b o d y p lu g
to p . T h e re b o u n d b u m p e r (2 0 ) is o n th e ro d (9 ). It h a s a sp e cia l o u te r flo a tin g
rin g , w h ich in ca se o f ve ry h a rd co m p re ssio n s (se e F IG . 3 B ), a p a rt fro m w o rkin g
a s e n d o f stro ke fo r th e fo rk le g , clo se s th e fo u r o il h o le s o f th e b o d y p lu g (1 9 ),
th u s slo w in g d o w n th e ro d co m p re ssio n to a g re a te r e xte n t.