JLG 1850SJ Service And Maintenance Manual Download

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SECTION 3 - CHASSIS & TURNTABLE

3121619

3-109

1894

276

524194

The total time in standstill-regeneration
mode exceeds the long-limit threshold: 2,5h
stand-still operation within 50h total motor
run time.
The error is activated if the engine runs to
much time in short Standstill regeneartion.

Stand-still mode is aborted / interrupted too
often by the operator
Stand-still is required too often due to miscalcu-
lation in the soot model
Stand-still mode does not reache temperature
level and regeneration level is therefore
reached after a short time again.

Read out stand-still statistics => see service
manual:
Stand-still operation finished or often inter-
rupted by driver / engine shut-off? => Run
stand-still and instruct operator
Stand-still operation required often by soot
load => Check dp DPF pressure sensor
Stand-still mode does not reach required tem-
perature level:
Check engine air path: Intake Trottle, EGR-Valve
and turbocharger okay?
Any leakage in engine air intake sytem or
exhaust gas system?
Check temperature sensors within exhaust sys-
tem: upstream DOC, downstream DOC
If soot load level of DPF allows it:
Perform Stand-still and check reached temper-
ature level upstream and downstream
DOC: T upstream DOC in the range of 480-
550°C? Downstream DOC after 25 min
stand-still main phase 590°C are reached?
Temerature traces are steady and even?
Temperature downstream DOC higher than
upstream DOC but difference does not
exceed 100 K?
Very small difference (< 10 K after 25 min
stand-still main phase, 590 °C downstream
DOC are not reached) => exchange DOC
Very big difference (>100 K after 25 min stand-
still main phase, 590 °C downstream
DOC exceeded) => check injection system of
engine & engine air path

1895

277

3519

The integrated temperature sensor of the
Urea Quality Sensor measures higher tem-
perature than threshold

Temperature sensor inside the UQS defect.
CAN Communication corrupted.
Overheating of the DEF tank due to malfunction
of the heating valve.
Flow direction is of coolant is wrong due to
mixed up the hoses routed to the heating
valve.
Overheating of the DEF tank due to heat transfer
from neighbor parts.

Check the temperature sensor signal for plausi-
bility. In case of improper signal,
exchange the suction unit in the tank.
Check CAN bus communication for proper sig-
nal. In case of improper signal, exchange
the suction unit in the tank.
Check the function of heating valve and routing
of the hoses. The coolant flow through
the heating valve must be observed according
to the shown arrow.
In case all actions above are OK, check the real
temperature in the DEF tank during
worst case condition and improve the installa-
tion of the DEF tank.

1896

278

3520

The integrated diagnostic of the Urea Quality
Sensor recognized a short circuit to battery

wiring harness of UQS corrupted
CAN Communication corrupted

Threshold for error detection is an internal ECU
threshold.
Check the wiring harness from the ECU to the
suction unit of the DEF tank
Check the CAN bus communication. If the signal
is corrupt, then exchange the suction
unit.

JLG 1850SJ, Service And Maintenance Manual

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