12 Servicing
12.9 Replacing seals
Housing: Replacing the screw plug 10*
Replace the screw plug
10*
.
Overflow valve: Replacing the screw plug 28*
Replace the screw plug
28*
.
Control block: Replace the screw plug 36*
Replace the screw plug
36*
.
Control block: Remove the O-ring 27*
1.
Take off the hexagon screws
25
, welding neck flange
26
and O-ring
27*
.
2.
Lightly grease the new O-ring and insert it.
3.
Mounting the welding neck flange with hexagon screws with torque.
Return valve: Replace the O-ring 19* and the O-ring 20*
1.
Remove the valve insert
18
from the control block and O-ring
19*
.
2.
Lightly grease the new O-ring and push on the valve insert.
3.
Remove the valve cone
21
from the control block and O-ring
20*
.
4.
Lightly grease the new O-ring and push on the valve cone.
5.
Remove the pressure spring
22
and
23
and valve cone
24
from the control block.
6.
Remove the O-ring
20*
from the valve cone
24
. Lightly grease the new O-ring and push on the
valve cone.
7.
Place the valve cone
24
, pressure spring
22
and
23
, valve cone
21
and valve insert
18
in the
control block.
Reversing valve: Replace the molded gasket 14* and O-ring 33*
1.
Set the lever of the reversing valve
30
to 45° so that the openings of the valve ball
17
are rotated
by 45°.
2.
Pull the plate spring
12
, valve insert
13
and molded gasket
14*
from the control block with the fin-
gers.
3.
Rotate lever of the reversing valve to the middle position and remove the valve ball.
4.
Remove the reversing valve lever, circlip
31
and supporting ring
32
.
5.
Press the tappet
16
towards the bottom.
6.
Remove the O-ring
33
from the control block.
7.
Insert the tappet
16
from the bottom and rotate in such a way that the valve ball can be inserted
via the nut.
8.
Insert the valve ball
17
.
9.
Lightly grease the new O-ring
33*
, slide over the tappet and press into the groove of the control
block.
10. Mount the supporting ring
32
and circlip
31
and insert the reversing valve lever.
11. Press the new molded gaskets
14*
carefully in until they are flush with the outer surface of the
control block.
12. Insert the valve insert
13
and plate spring
12
. Ensure that the bulge of the plate spring points to-
wards the control block.
Pressure gauge: Replace the seal ring 37*
1.
Remove the pressure gauge
38
.
2.
Replace the seal ring
37*
and mount the pressure gauge.
Mounting the housing and control block
1.
Clean the sealing surfaces, put a new flat gasket
11*
on the control block.
2.
Mount the housing
9
at the control block with socket screws
1
and mount new copper seals
2*
with torque.
3.
Lightly grease the new O-ring
8*
.
4.
Mount the pump station on the oil pan with socket screws
35
, hexagon nuts
6
, washer
7
and O-
ring
8*
with torque.
5.
Install the pump station
Ä
Installation, removal, Page 16.
6.
Filling and venting the pump
Ä
42
OID 06en-GB Edition 2019-11
Operating instructions