MAXX 450D/470D/Diesel Page 9-3
HydraMaster Corporation
3.0. Turns over but will not start. There is no spark
3.1. The 15 amp fuse is blown. Check the fuse. If it is blown, inspect the wiring for a wire
shorted to ground. Repair as necessary.
3.2. There is a loose or broken wire. Check all wiring to the ignition processor and to the
three ignition coils. Repair as necessary.
3.3. The engine ignition system is malfunctioning. Refer to a qualified engine service
technician for inspection.
4.0. Will not come up to medium or high RPM
4.1. The speed control switch is defective. Check switch for continuity between posts.
Replace as necessary.
4.2. The speed control fuse is blown. Check the fuse. If it is blown, inspect the wiring for
damaged wire. Repair as necessary.
4.3. The engine has been overreved. Turn ignition switch off and back on to reset the
overrev safety function.
4.4. The speed control governor or the throttle actuator is faulty. Refer to qualified
service technician for diagnosis and repair.
4.5. There is excessive back-pressure on the engine or blower exhaust. Check for
clogged blower heat exchanger.
5.0. Runs rough at medium or high RPM
5.1. A spark plug is defective. Remove and inspect spark plugs. Replace as necessary.
5.2. A spark plug wire is loose on the spark plug or has been damaged. Check for
loose or damaged wire. Replace wire as necessary.
5.3. Poor spark on one or more cylinders. Ignition system is faulty. Refer to qualified
engine service technician for diagnosis and repair.
5.4. Inadequate fuel supply to the carburetor. Test the fuel volume at the carburetor by
removing the fuel line from the carburetor inlet and placing the line in a metal container
with a capacity of at least 16 ounces. It should be 12 oz / minute. Check for clogged
filter or obstructed fuel line. Also check to make sure the fuel pump is mounted vertically
and is close to the fuel source. Repair as necessary.
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