Page 9-4 MAXX 450D/470D/Diesel
HydraMaster Corporation
5.5. Low compression on one or more cylinders. Check compression. If low, check
valve adjustment. If incorrect, adjust to proper specs. This operation should be
performed by an experienced service technician. If adjustment is okay, there is a
possibility of burned valves, burned head gasket or worn cylinders. Refer to qualified
engine service technician.
6.0.Runs rich (Black smoke)
6.1. Dirty air filter. Inspect and replace as necessary.
6.2. Choke is partially closed. Inspect choke for proper operation. Repair as necessary.
6.3. Excessive fuel to carburetor. Insure that fuel pump is proper PSI rating. A fuel pump
with a psi rating in excess of that of the pump supplied with the machine could
overpower the inlet valve in the carburetor, causing excessive fuel to be supplied to the
carburetor.
6.3.1. There is dirt in the carburetor, causing the carburetor inlet valve to be held open. Refer
to qualified engine service technician.
6.4. One or more safety switch is attempting to shut down machine. Isolate each safety
switch, one at a time. If one switch is found to cause the problem, first check to see if
there is a problem with the machine causing the switch to activate.
6.4.1. If no problem is found, replace the switch.
7.0.Engine loses RPM and misses, but doesn’t die
7.1. The machine fuel line has a vapor lock. Remove the fuel line from the carburetor inlet
and check for air in line. Caution: Do not let fuel contact hot engine surfaces! If air is
observed, let the machine cool off and check for condition that would cause a vapor lock
situation.
7.2. The fuel pump is mounted incorrectly. Check to make sure the pump is mounted
vertically and is close to the fuel source. Repair as necessary.
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