Groeneveld TWIN General Manual page 44

TWIN General Manual
44 Maintenance instructions
Malfunction
3. Signal lamp lights
continuously for 2
minutes at the end of
every pumping
phase.
Cause
The grease pressure switch
did not switch.
Probable causes:
a. The primary grease line
leaks. Because of this, no
pressure can be built up.
b. Air in the system. Within
the maximum pumping
time insufficient pressure is
built up.
c. Broken grease pressure
switch.
d. O-ring damaged or left
out when replacing a
metering unit, grease
pressure switch or blind
plug. Because of this it is
possible that grease flows
from one line to the other.
e. 5/2 valve broken. Because
of this, no pressure can be
built up.
f. Internal leak of metering
unit or grease pressure
switch.
g. Surrounding
temperature too low or
grease too viscous.
h. Wiring defect or bad
contacts.
i. Other probable cause.
Solution
a. Replace or repair the line
and vent the relevant line.
b. Vent both primary lines
and carry out the single-
test cycle twice.
c. See malfunction finding
procedure for the grease
pressure switch (paragraph
5.5.4).
d. Check and mount a new
O-ring if necessary. Also see
malfunction finding
procedure of internal
system leak, (paragraph
5.5.4)
e. See malfunction finding
procedure pump and 5/2-
magnetic valve (paragraph
5.5.4)
f. Replace the metering
unit or grease pressure
switch (see page 51).
g. Replace the grease.
h. Check the wiring and
contacts. Replace if
necessary.
i. Consult the dealer
EG1701