Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List page 80

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
CAUTION
Never use soluble oil in the cooling system.
(1) General
A permanent type antifreeze is recommended for use in the cooling system.
CAUTION
1. DO NOT use methanol or alcohol as antifreeze.
2. DO NOT mix brands or type of antifreeze. A solution containing two or more types
of antifreeze is impossible to test accurately.
(2) Selecting antifreeze
a Select a permanent type antifreeze known to be satisfactory for use with chromate corrosion
resistor.
b When it is not known if the antifreeze is satisfactory for use with chromate resistor, check with
local engine manufacturer's representative for a list of compatible antifreezes.
(3) Checking antifreeze solution
Check the solution with a reliable tester when in doubt about antifreeze protection.
d) Draining the Cooling System
To completely empty the cooling system requires draining the engine block (if furnished) and the
radiator assembly. Both drain valves (radiator and block drain), can be opened/closed at the same
time but they do not need to be. Follow these steps to drain the cooling system:
(1) Remove radiator cap.
(2) Place a drain pan with at least a 40 quarts (28.4 liters) capacity under radiator to catch coolant.
(3) Place the radiator drain hose that comes off the two radiator drain valves, into the drain pan.
(4) Open the radiator drain valves.
(5) Allow the system to drain completely.
NOTE: Be sure the drain valves do not clog during draining.
(6) When the system is completely drained, close the drain valves and replace engine drain plug.
e) Flushing the Cooling System
Flushing the cooling system should be a yearly maintenance procedure. By flushing the system,
clean water is forced through the engine block to remove expired coolant and other contaminants.
May 2, 2013 Chapter 2-2
Page 12