Stihl TS 420 - Installation

48 TS 410, TS 420
: Drive the piston pin (2) out of the
piston with assembly drift (1)
1110 893 4700.
If the piston pin is stuck, tap the end
of the assembly drift lightly with a
hammer to loosen it.
The piston must be held steady
during this process to ensure that
jolts are not transmitted to the
connecting rod.
: Remove the piston (1) from the
connecting rod.
– Examine the piston rings and
replace if necessary, b 7.8.
370RA172 TG
1
2
370RA173 TG
1
7.7.2 Installation
: Pull out the needle bearing (1),
examine and clean it, replace if
necessary.
: Coat the needle bearing (1) with
oil and insert it in the small end.
– Align the piston so that the arrow
(arrow) on the piston head points
towards the cutting wheel and the
mount for the snap ring is on the
clutch side.
– Position the piston on the small
end.
: From the clutch side, fit the
assembly drift (1) 1110 893 4700
with the small diameter first
through the piston and small end
(needle cage) and secure the
piston.
370RA161 TG
1
370RA174 TG
1
– Coat the piston pin with oil.
: Fit the piston pin (2) on the small
diameter of the assembly drift (1)
and slide it into the piston.
: Remove the sleeve (1)
5910 893 1707 from the installing
tool (2) 5910 890 2210.
: Attach the snap ring (1) to the
magnet (2) and align it so that the
snap ring gap is on the flat side
(arrow).
370RA175 TG
1
2
370RA176 TG
2
1
2
442RA406 TG
1