Engine Cooling System Maintenance; Bleeding The Fuel System - Nortrac XT20 Owner's Manual

4.20 Engine Cooling System Maintenance

The engine cooling system uses antifreeze only. In general,
antifreeze is good for a period of 2 years or 1600 hours and then
should be replaced, the cooling system should be flushed before
new antifreeze is added. (Note : Antifreeze must be used to
prevent freezing in winter) Close the radiator drain valve, add a
50/50 anti-freeze mix and run the engine for 20 minutes. Check
for leaks and fluid level once engine has cooled down.
NOTE: During winter, water in the radiator can freeze, causing the engine block to crack. Always use
antifreeze in the radiator.
4.21

Bleeding the Fuel System

If a tractor is out of commission for a long time, after
replacing the diesel engine filter or with an empty fuel tank,
air could enter the fuel line, making it difficult to start the
engine. This problem can be fixed by following the steps
below but first the fuel tank should be filled and the fuel cutoff
switch turned on:
• Unscrew the bleeder screw (A) on the fuel filter and toggle
the fuel supply pump draw knob (B) up and down until the
diesel is discharged out of the hole of the bleeder screw
and there are no bubbles.
•
Tighten the bleeder screw (A), then unscrew the fuel
injection pump bleeder screw. Pump the fuel supply hand
primer knob (B) until the diesel is discharged out of the
hole of the bleeder screw and there are no bubbles, then
tighten the bleeder screw (C).
NOTE: The engine runs on high-quality light diesel fuel and must meet specifications. Generally, light diesel
No. 2 is applied during the summer while No.1 is used during the winter.
Maintenance Instruction
61
Engine Cooling System
Picture 4-33
Maintenance
Exhausting the Fuel System
Picture 4-34