HydraMaster Boxxer 427, Manual

Page: 141 / 170

HydraMaster Corporation
04/20/04
Boxxer 427 Page 9-1
Engine Troubleshooting
Boxxer 427
Section 9-1
1.0. Will not turn over
1.1. There is a loose or corroded battery terminal . Clean and tighten the battery terminal
connections.
1.2. The battery is dead . Recharge or replace the battery. Test the charging system.
Repair if necessary. WARNING: Do not attempt to jump-start this machine from a
running vehicle. The amperage output from an automobile will damage the charging
system of the truckmount.
1.3. The 25 amp main power fuse in the electrical panel has blown . Inspect the wiring
thoroughly to locate shorted or damaged wires.
1.4. The vacuum blower has seized . Attempt to turn the engine by hand. If it will not turn,
refer to Vacuum section II, 5.0.
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 going from the switch, replace the switch.
1.6. 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.
1.7. 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 be turned over by
hand and the vacuum blower is not locked, 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 no 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.)