Service Manual User Manual

Section 10
10-56
Model 3606 • Origin 10/99
4. Connect the negative (-) battery cable at the negative
battery terminal (Fig. 10– 55).
Figure 10– 55. Connect the negative (-) battery cable
to the negative (-) battery terminal.
b. Transmission Neutral Start Feature
The transmission neutral start feature is a safety feature
designed to prevent the engine from starting with the
transmission in FORWARD (F) or REVERSE (R).
Shifting into NEUTRAL (N) activates the neutral relay (in
the relay and fuse panel). When the travel select lever is
in NEUTRAL (N), electrical power flows to the starter
relay, allowing the starter to engage and start the engine.
Test the transmission neutral start circuit as follows:
• The starter MUST NOT operate with the
travel select lever in FORWARD or REVERSE
• The starter MUST NOT operate when the
park lock is OFF (disengaged)
• The starter MUST operate with the travel select
lever in NEUTRAL
If the starter fails to turn the engine with the travel select
lever in NEUTRAL (N) and the ignition switch in the
START position, refer to
Section 10.9 Electrical System
Troubleshooting
. The neutral position contacts in the shift
switch are non-repairable. Replace the switch if defective.
10.8.4 Thermo-Start Plug
(optional for Perkins engines only)
The thermo-start plug (Fig. 10– 56) is located in the Per-
kins engine intake manifold, plumbed into the fuel line.
Figure 10– 56. The thermo-start plug is located in the
Perkins engine intake manifold.
The thermo-start plug is activated by the PREHEAT igni-
tion key switch position (Fig. 10– 54). The PREHEAT cold-
starting aid should be used when the temperature is
below 32° F (0° C), but not below 10 ° F (-12°C) if 10W30
engine oil is used in the crankcase. Consult the appropri-
ate Perkins engine manual for other variables.
When the ignition key switch (Fig. 10– 54) is turned to the
PREHEAT position, an air/fuel mixture in the intake mani-
fold is ignited to help make cold-weather starting easier.
For specific cold starting instructions, see the
Owners/
Operators Manual
for this vehicle.
The engine is fitted with an efficient cold-starting aid and
no responsibility can be accepted for any damage
caused by unauthorized starting aids.
If the engine is difficult to start or fails to start and the
thermo-start plug is suspected, check the electrical con-
nection at the plug. If the electrical connection is not sus-
pect, check that fuel is indeed reaching the thermo-start
plug by unscrewing the fuel line fitting at the plug. If fuel
is present, the plug itself may not be working correctly.
This can be checked by removing the air cleaner and
watching the cold starting aid while the equipment is
used. When the ignition key switch is turned to the PRE-
HEAT position, the element should become red hot, and
when the ignition key switch is placed in the START posi-
tion and the starter engages the engine, ignition of the
fuel should occur.
OS1040
Negative (-)
Terminal
WARNING: Ether, starting fluid, or high-energy
fuels should not be used with the PREHEAT
system. An explosion may cause serious injury
or engine damage.
1. Thermo-start Plug
2. Intake Manifold
3. Electrical Terminal
4. Fuel Line Fitting
MA1071
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