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& DQ6H engine models (Figures #33A) and near the
oil filters on DR8H, DS0H, and DT2H engine models
as shown. (Figures #33B & #34).
With engine off, check continuity between the two
terminals on the oil pressure switch. Note, do not
disconnect wires when performing this task.
Figure #33A – DP6H & DQ6H engine models
Figure #33B – DT2H engine models
Figure #34- DT2H engine models
If circuit is open, replace oil pressure switch.
After new switch is replaced: On the Clarke
instrument panel, operate the “OVERSPEED
RESET” switch for two (2) seconds and release.
(Refer to Figure #9)
The “INITIALIZATION PATTERN’ will flash. This
is normal. The continuous five (5) blink flash
sequence should turn off at this point.
If circuit is closed, the oil pressure switch is not
damaged and is working normally as expected.
Proceed to engine speed sensor check, below.
Engine speed sensor (magnetic pick-up) check
Verify wiring and connector at engine speed sensor
are secure. Magnetic pick-up is located on the right
side of the engine on the flywheel housing. (Figure
#35)
Figure #35
With engine running, verify that the tachometer is
functioning normally.
Refer to section 3.5.4 of Engine Operator’s Manual
to properly reposition the magnetic pick-up if
tachometer is not functioning.
Once magnetic pick-up is repositioned: On the
Clarke instrument panel, operate the “OVERSPEED
RESET” switch for two (2) seconds and release.
(Refer to Figure #9).
The “INITIALIZATION PATTERN” will flash. This
is normal. The continuous five (5) blink flash
sequence should turn off at this point. If problem still
exists, replace engine speed sensor (magnetic pick-
up).
3.5.6 FIELD SIMULATION OF PUMP
CONTROLLER ALARMS
Field simulation of (5) pump controller alarms
• Alarm 1: Over speed Shutdown: Follow
over speed verification steps per section 3.5.3.
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