STIHL TS 400 25
5.9.2
Installing the crankshaft
- Heat the housing halves to approx.
150 °C around the seats of the
deep groove ball bearings.
- Press the deep groove ball
bearings into the housing halves as
far as possible.
Note:
The deep groove ball bearings
can be inserted as far as possible by
hand if the housing halves have been
heated as specified. This must be
done quickly, since the deep groove
ball bearings immediately heat up
and expand.
• Insert the crankshaft with the
tapered stub in the deep groove
ball bearing of the ignition-side
half of the housing.
• If the ignition-side housing half can-
not be heated, the deep groove ball
bearing must be driven in as far as
possible with drift pin (1).
• Sleeves must be present; they
must be driven into the housing
half if necessary.
• If the clutch-side housing half can-
not be heated, the deep groove ball
bearing must be driven in as far as
possible with drift pin (1).
• Screw the threaded sleeve (1) as far
as possible onto the fully retracted
spindle of assembly tool ZS (2).
- Coat the tapered crankshaft stub
with oil.
Each half of the crankcase can
be replaced separately if the
crankcase is defective.
New crankcase halves are supplied
complete with fitted deep groove ball
bearings and rotary shaft seals.
The serial number must be
stamped into the number strip of
the new crankcase with 2.5 mm
figure stamps.
If the old crankcase is reused,
gasket scraps must be removed and
the sealing faces cleaned. These
faces must be absolutely clean in
order to ensure a perfect seal.
• Press both rubber buffers in with
the smaller hole (1) facing towards
the inside of the housing half until
the outer groove (2) engages the
edge of the housing (3).
