If no problems with the EPROM
890-940 rpm, and come back on again at 2250-2350
can be found, the APC 100
control box must be replaced.
If correct, the engine idle switch and full
If all LEDs perform correctly, proceed to
throttle switch are properly set and their
circuits are good. Proceed to Gear
If LED operation is not correct:
With main hydraulic pump disengaged and
Disconnect relay box harness
transmission shift lever in N, start engine and verify
from APC 100 control box.
idle speed is 840 50 rpm. If needed, adjust as
follows. Otherwise proceed to step 2.
Check socket 23 for 24 vDC
signal at idle and drops out when
If reading is greater than the range,
engine reaches 890-940 rpm.
check throttle cable and throttle
assembly for proper installation, refer to
(a) If signal is not present or
THROTTLE AIR CYLINDER AND
does not drop out, check idle
switch. Idle switch should be
procedures, Section 2.
closed until rpm setting is
If reading is still out of range, adjust fuel
injection pump idle set screw located
between injection pump control lever
(b) If signal drops out at wrong
and injection pump body. Turn screw
rpm setting, adjust idle switch
counter-clockwise to increase idle speed
carriage bolt (30, Figure 2-2-
and clockwise to decrease idle speed.
3) closer to idle switch to
increase rpm setting and
Gradually increase engine speed while
observing green diagnostic LED on top of APC 100
control box. It should be on at idle, turn off at
and recheck operation.