HydraMaster Corporation
MAXX 450D/470D/450 Diesel
Section 9-1
1.0. Will not turn over
1.1. The circuit breaker on the wiring panel has tripped. This switch resets automatically.
Remove wires and test for continuity. If the breaker does reset, inspect the unit to
determine the cause of the tripped breaker. If the breaker does not reset, replace after
wiring has been inspected.
1.2. There is a loose or corroded battery terminal. Clean and tighten the battery terminal
connections.
1.3. The battery is dead. Recharge or replace the battery. Test the charging system. Repair
if necessary. WARNING: Do not jump-start this machine from a running vehicle. The
amperage output from an automobile will damage the charging system of the truck mount.
1.4. There is a problem with the starter solenoid. If there is 12 volts at the battery
connection and at the key switch connection with the key in the start position, but there is
not 12 volts on the starter connection of the solenoid, replace the solenoid.
1.5. The ignition switch is defective. Test to see if there is 12 volts to the switch. If there is,
but there is not 12 volts coming from the switch, replace the switch.
1.6. The vacuum blower has seized. Refer to Vacuum section II, 5.0.
1.7. The starter motor is defective. Check to see if the engine can be turned over by hand.
If it can and if there is 12 volts from the starter solenoid to the starter, replace the starter.
1.8. There is a mechanical problem with the engine. If the engine can not be turned over
by hand and the vacuum blower is not locked up, refer the engine to a qualified service
technician to determine the cause of the problem.
2.0. Turns over but will not start. There is spark
(Note: To check for spark, use the following procedure. Remove a spark plug from the
engine. Attach the lead wire back onto the plug. Ground the threaded part of the spark
plug to an unpainted engine surface. While holding the plug and wire assembly by the
insulated wire, crank the engine over by turning the ignition switch to the “start” position.
You should observe a blue spark between the two electrodes of the spark plug.)
Engine Troubleshooting
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