HydraMaster Boxxer 423s - Engine Troubleshooting: Starting Issues

8-5: Systems Troubleshooting Systems Troubleshooting: 8-4
2.0 Turns over but will not start; there is no spark. (To check for spark, refer to
engine manual.)
Possible Cause Solution
2.1 The recovery tank is full. Drain the tank.
2.2 The recovery tank oat is
faulty.
Inspect the oat. Repair or replace as necessary.
2.3 The engine ignition
system in faulty.
Refer to a qualied service technician for further
troubleshooting.
2.4 The water box is empty Attach an inlet garden hose to ll the water box.
If too many attempts are made to start the
engine prior to lling the water box, it is
possible to ood the engine (see step 3.3 in
the next section)..
3.0 Turns over but will not start; there is spark. (To check for spark, refer to engine
manual.)
Possible Cause Solution
3.1 Fuel is not reaching the
carburetor.
Test for power to the fuel pump. Refer to Electrical
Section.
If power is present, inspect the fuel pump. Replace if
necessary.
Inspect the fuel lines between the source and the
carburetor. Repair or replace as necessary.
3.2 The carburetor solenoid is
faulty.
Test for power to the solenoid. Refer to Electrical
Section.
If power is present, inspect the solenoid. Replace if
necessary.
3.3 The engine is ooded. Pull the throttle cable completely and crank until the
engine starts.
3.4 The spark plugs are worn
or dirty.
Inspect and replace as necessary.
3.5 None of the above. Refer to a qualied service technician for further
troubleshooting.
ENGINE
1.0 Will not turn over
Possible Cause Solution
1.1 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.
Do not attempt to jump start the truckmount
from a running vehicle. The amperage output
from an automobile will damage the charging
system of the truckmount.
1.3 The main fuse is blown. Check the main fuse.
If the fuse is blown, inspect the electrical system for
worn or shorted wires. Repair or replace as necessary.
1.4 The vacuum blower has
seized.
Attempt to turn the coupler by hand. If it will not turn
refer to the Vacuum System Troubleshooting Section.
1.5 The ignition switch is
faulty.
Test to see if there is power both to and from the
switch. Refer to the Electrical Section.
1.6 The starter solenoid is
faulty.
Test to see if there is power to solenoid with ignition in
“Start” position. Refer to Electrical Section.
1.7 The starter motor is faulty. Test to see if there is power to the motor with the
ignition in “Start” position. Refer to the Electrical
Section.
1.8 None of the above. Refer to a qualied service technician for further
troubleshooting.