62-11637
8–10
7. With the fuel tank empty the output reading
should be approximately 0.25 VDC.
8. With the fuel tank full, the output reading should
be approximately 4.75 VDC.
9. Start unit and check for leaks.
8.5.8
Fuel Heater
The optional fuel heater (item 6,
) applies
heat to fuel in the fuel filter. Heating the fuel dissolves/
prevents paraffin wax crystals (and ice) that form when
diesel fuel is chilled thus enabling the water separator
to work more efficiently and to prevent the filter from
plugging with wax and/or ice crystals. When the ambi-
ent air sensor is reading 77°F (25°C) or higher, the con-
trol system will not enable this circuit. Also, the heater
is fitted with an internal temperature switch (FHTS -
see schematic diagrams,
). The heater
used in spin on type filter systems closes, on a tem-
perature fall, to energize the heater element at tem-
peratures below 45°F (7.2°C) and opens, on a
temperature rise, to de-energize the heater element at
75°F (23.9°C). The heater used in suction side filter
systems closes at temperatures below 53 ± 7°F (11.7 ±
3.9°C).
To test the fuel heater, do the following:
), check to
ensure the Ambient Air Temperature reading is
below 77°F (25°C), if the reading is below this
temperature the fuel heater relay (FHR) should
be energized. If the relay does not energize,
check for power from PCM fuse F10 to the relay
coil + terminal and ground from the coil negative
connection through PCM-17 to 3MM-17.
2. With the relay contacts closed, check for power
from F7, through the relay contacts, fuse F14,
through PCM-14 & 3 through SP8 to the fuel
heater connector at terminal A. Check also for
ground from the fuel heater connector terminal
B through SP
−
3 to GND1RING1.
3. If the wiring is good and the fuel heater tempera-
ture is below the cut in temperature replace the
fuel heater. If the wiring is good but the fuel
heater temperature is above the cut out tem-
perature, the internal temperature switch may
be open. Retest at a temperature below the
switch close point as soon as conditions allow.
4. Start unit and check for leaks.
8.5.9
Engine Oil And Oil Filter
a. To Check The Engine Oil Level:
1. Warm up the engine and then stop it by placing
the STOP/RUN-OFF switch in the OFF position.
2. Unscrew the cap/dipstick see
the dipstick clean and insert the cap into the oil
fill tube without threading into tube.
3. Remove the dipstick again and check oil level.
DO NOT add oil if the level is in the “safe” range.
If needed, add oil as indicated by markings on
dipstick until level is in the “safe” range.
4. After checking or adding oil as necessary,
ensure cap is threaded back onto oil fill tube.
Figure 8.11 Engine Oil Level
b. To Change Engine Oil
1. Warm up the engine and then stop it by placing
the STOP/RUN-OFF switch in the OFF position.
Ensure the unit will not start automatically by
disabling any two way communication.
2. If available, install oil drain tool (CTD P/N 68-
15763-01). See
. The Oil Drain Tool
not only directs the oil over the door latch pin
bracket and bottom panel, on units so equipped,
but also holds a typical drain bucket in place
while the oil is draining from the engine.
3. Remove drain plug drain engine oil. Replace
plug and refill engine with oil. Continue with step
c. and change oil filter.
Figure 8.12 Oil Drain Tool
Cap
Dipstick
QTS
1
2
SAFE
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