Pompa ad Ingranaggi - Serie WPP, WPL
Gear Pump - WPP, WPL Series
38
Draw a reference mark on the main body
9
to avoid reversing base planes on reassembly
and remove it together with the 2 O-ring gaskets
7
housed in it; the operation may become
difficult for the accuracy of shafts and dowel pins
C
. Remove the duct shaft
2
, remove the
locking spring clip
5
, remove the duct gear
6
A from the shaft and extract the feather key
8
; carry out the same operation on the conductor shaft, after disassembling the seeger ring
;
in the front side.
On reassembly, reverse the procedure, by taking as reference the position of the rear cover,
the position of dowel pins and internal drain lines holes and do not pinch the O-rings
7
.
Tighten the cover "cross" fastening screws
B
by rotating simultaneously the motor shaft, to
avoid differentiated pressures on gears, which might increase frictions. With regard to tight-
ening torques, see paragraph
4.6.3
. Then carry out operations indicated in items
c),
a)
.
f) Safety valve replacement
Unscrew the cap
O
and remove the external sealing washer
L
. Move the nut
M
and un-
screw completely the adjusting ring nut
N
, paying attention to the thrust exerted by the
spring
A
; disassemble the internal sealing washer
L
.
Remove the spring
A
with the shutter assembled
D
.
Disassemble the valve seat
P
and the sealing washer
L
.
During re-assembly check the correct coupling between the shutter
D
and the seat
P
and
replace all sealing washers
L
.
