JLG G6-42P Service Manual - Manual (Page 129)

ENGINE COOLANT SPECIFICATIONS--CONTINUED
Supplemental Coolant Additives (SCAs):
IMPORTANT: DO NOT over-inhibit antifreeze solutions, as
this can cause silicate-dropout. When this
happens, a gel-type deposit is created which
retards heat transfer and coolant flow,
causing engine to overheat.
NOTE: John Deere Pre-diluted Antifreeze/Summer Coolant
conccentrate, and John Deere COOL-GARD contain
supplemental coolant additives (SCAs). However, as
the coolant solution loses its effectiveness, additives
will need to be added.
Operating without proper coolant additive will result in
increased corrosion, cylinder liner erosion and pitting,
and other damage to the engine and cooling system. A
simple mixture of ethylene glycol and water WILL NOT
give adequate protection.
The use of supplemental coolant additives reduces
corrosion, erosion and pitting. These chemicals reduce
the number of vapor bubbles in the coolant and help
form a protective film on cylinder liner surfaces. This
film acts as a barrier against harmful effects of collaps-
ing vapor bubbles.
Inhibit the antifreeze-coolant mix with a non-chromate
inhibitor. John Deere Liquid Coolant Conditioner is
recommended as a supplemental coolant additive in
John Deere engines.
IMPORTANT: Check inhibitors between drain intervals
every 600 hours or 12 months of operation.
Replenish inhibitors by the addition of a
supplemental coolant additive as necessary.
DO NOT use a soluble oil.
Additives eventually lose their effectiveness and must
be recharged with additional supplemental coolant
additives available in the form of liquid coolant condi-
tioner. See TESTING DIESEL ENGINE COOLANT and
REPLENISHING SUPPLEMENTAL COOLANT ADDI-
TIVES (SCAs) BETWEEN COOLANT CHANGES, as
described later in this group.
pg.2
John Deere Liquid Coolant Conditioner