Stihl 140, Repair Manual

Page: 15 / 31

Note: Where possible, defective
valves should only be replaced as
a complete unit (O-ring (1), valve
head (2), plate (3), spring (4) and
cage (5)). The intake valves and
delivery valves are identical.
Brass valve block only:
•
Fit valve discs (6).
- Check correct functioning before
installing valves.
Reassemble parts in reverse order.
Ensure that all O-rings are fitted
and that the valve block is not mi-
saligned when fitted.
- Turn in fastening screws.
- Insert microswitch and turn in
fastening screws.
- Tighten fastening screws on
valve block down crosswise
(15 Nm).
- Remove valve block (7.3).
- Drain oil (see chapter 11).
The pump housing and pump
piston are removed and installed
in the same way as on the high-
pressure cleaners of series
RE 102 K, 104 K and 106 K.
Note: Steady the pump housing
when undoing the fastening
screws so that it is not pushed
aside by the force of the springs.
- Remove pump piston (see 7.4).
- Remove spring and washer.
- Remove circlip.
•
Examine piston (1), spring (2),
washer (3) and circlip (4) and
replace if necessary.
Reassemble parts in reverse
order. Ensure that washer is fitted
correctly.
621RA024 BL
1
2
3
4
5
6
621RA042 BL
1
2
3
4
7.4 Removing / installing
pump housing and
pump piston 7.5 Disassembly / assembly
of the pump piston
RE 140 K, 160 K 15