Taarup 7640, Руководство оператора

Страница: 69 / 72

69
12 Troubleshooting
It is important to clarify whether the fault is
due to mechanic, electrical or hydraulic
factors. If a function will not work properly,
check whether there is voltage on the sole-
noid. If so, the fault lies with the valve. If the function does not stop working when the
power supply is interrupted, the fault lies
with the hydraulic valve. If the function stops
working, the fault is electric. Look for error
messages in the command panel display.
12.1 Troubleshooting hydraulics
Troubleshooting
a. Oil flow block in quick-release couplings
to tractor.
This may, for example, produce pressure on
return pipe (blocked return coupling). Try
quick-release coupling adapted to tractor.
b. Intensive heating of oil.
Oil temperatures of up to 70º C are not
unusual during continuous operations. 60º C
feels very hot when touched. Check that the
plug for closing the centre of the central unit
(John Deere plug) is being used correctly
(only on tractors with variable hydraulic
pumps, i.e. mainly John Deere).
c. Fault in spool valve unit.
Check that the actual spool is moving
smoothly. See spool valve overview.
Fit spool handle and ease the malfunction-
ing spool back and forth a few times first.
Observe! Reduce oil flow from the tractor to
a minimum before testing and keep your
distance from moving parts on the machine.
If the functions can be operated, the prob-
lem is electrical.
d. Contaminated oil.
Badly contaminated oil is extremely detri-
mental to the hydraulic system. Bear in mind
the timed intervals for checking and replac-
ing filter and oil - see sections 6.2.1 and
6.2.2.
Contaminated oil can contain large amounts
of particles, which cannot be filtered, but
can nevertheless cause wear to the motor
seal and blocking of valve spools.
Experience shows that the hydraulic oil in
the tractor is often badly contaminated by
particules and water.
The fault is impossible to repair.
Contact your dealer. Any kind of information
regarding faults found is useful for a quick
repair.