Page 9-2 MAXX 450D/470D/Diesel
HydraMaster Corporation
2.1. Recovery tank is full. Empty the tank.
2.2. Recovery tank float is defective. Disconnect float. If engine starts, replace the float.
2.3. The high temperature shut-down function of the temperature controller has shut
the engine down. Observe the temperature gauge. If it appears above normal operating
range (250° or higher) allow the machine to cool down. If it will still not start, refer to a
qualified service technician to have the temperature controller tested.
2.3.1. If the machine starts after it has cooled down, refer to the Heating System
section, IV, 1.0.
2.4. The engine overheat switch has activated and caused the engine to shut down.
Allow the engine to cool down and inspect the engine coolant level. If the coolant level is
low, inspect cooling system for leaks and repair as necessary before adding coolant. If the
coolant level is normal, remove the wire from the engine overheat switch. If the engine
starts with the wire removed, replace the switch.
2.5. The spark plugs are faulty. Remove and inspect. Replace if necessary.
2.6. Fuel is not reaching the carburetor inlet. Check the fuel pump. If it is working, check
to see in the pump is delivering 12 oz / minute flow to the carburetor.
2.6.1. If it is not, inspect the fuel lines between the pump and the carburetor. Also make
sure the pump is mounted vertically and close to the fuel source. Repair or replace any
faulty parts as necessary.
2.6.2. If the pump is not working, check for 12 volts and a ground at the pump.
2.6.3. If 12 volts is not present at the pump, check the wiring to the pump, including the
fuse. Repair or replace as necessary. Note: If the fuse has blown, carefully inspect the
wiring for a damaged wire. Repair immediately.
2.6.4. If 12 volts is present at the pump and the ground is good, replace the pump.
2.7. The carb solenoid is malfunctioning. Test for 12 volts and proper ground at solenoid. If
both test okay, replace the solenoid.
2.8. The engine is flooded. Wait for a few minutes and attempt to start with the choke open.
Note: If the engine has been flooded, it may be necessary to remove and clean the spark plugs.
2.8.1. Check for proper operation of the choke (manual or automatic). Make sure it is
opening properly.
2.9. There is a mechanical problem with the engine. Have engine inspected by a qualified
engine service technician.
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