ROAD SPRINGS
AND
SHOCK ABSORBERS
OIL-
SEAL
E-
G-
Fig.
q
The
Front
Shock
Abwrber.
FRONT SHOCK ABSORBER
I.
DESCrnON
A
telescopic type shock absorber is fitted,
utilising a stem fixing at the top with rubber
bushes, large diameter steel washers and
lock nuts. At the lower end it is first attached
to a
fulcrum
pin bracket with rubber bushes
interposed between shock absorber eye and
fulcrum
pin, the bracket assembly is secured
to the lower side of the spring pan.
The
body of the shock absorber is in the centre
of the coil spring.
2.
MAINTENANCE
The shock absorber is a sealed unit and
requires no topping up. If it is found to be
unserviceable
it
must be replaced.
The only maintenance that
can
be required
is the renewal of the rubber mountings.
This is detailed in the "Front Suspension,
Section G" under "To remove front shock
absorber."
NOTATION FOR
FIGURE
4
A.
Port
in
Piston.
B.
Portion of Cylinder below Piston.
C.
Portion of Cylinder above Piston.
D.
Piston Rod.
E.
Port in Piston Rod Guide.
F. Piston Rod Guide.
Fv. Foot Valve.
G.
Foam Tube.
H.
Oil Reservoir.
P. Piston
Pv.
Piston Valve.
RV. Rebound Valve.
3.
OPERATION OF
THE
TELESCOPIC
SHOCK ABSORBER
(Fig.
4)
This shock absorber operates by theone-way
circulation of oil. By
this
method of circula-
tion the oil moves
all
the time the unit is in
operation thus keeping the unit cool under
the most arduous conditions of service. The
valve gear is simple, of robust construction,
and is self
cleaning.
On the bump stroke, the oil pressure opens
the piston valve
m)
against the
spring
load
and oil asses through the
ports
(A)
m
the
piston
(F)
from the Lower to the upper por-
tion of the cylinder
(B
to C). The
excess
oil
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