JLG G6-42P Service Manual - Manual (Page 128)

Engine coolants are a combination of three chemical
components: ethylene glycol, (antifreeze), inhibiting
coolant additives and quality water.
Coolant solutions of quality water, ethylene glycol
concentrate, (antifreeze), and supplemental coolant
additives, (SCAs), MUST be used year-round to protect
against freezing, boil-over, liner erosion or pitting, and
to provide a stable, non-corrosive environment for
seals, hoses and metal engine parts.
Some products, including John Deere PREDILUTED
ANTIFREEZE/SUMMER COOLANT and John Deere
COOL-GARD, are fully formulated coolants that
contain all three components in their correct concentra-
tions. Do not add an initial charge of supplemental
coolant additives to these fully formulated products.
Some coolant concentrates, including John Deere
ANTIFREEZE/SUMMER COOLANT CONCENTRATE,
contain both ethylene glycol antifreeze and inhibiting
coolant additives. Mix these products and quality water,
but do not add an initial charge of supplemental
coolant additives.
Coolants meeting ASTM D5345, (prediluted coolant) or
ASTM D4985, (coolant concentrate), require an initial
charge of supplemental coolant additives.
Water Quality:
Water quality is important to the performance of the
cooling system. Distilled, deionized or demineralized
water is recommended for mixing with ethylene glycol
base engine coolant concentrate. All water used in the
cooling system should meet the following minimum
specifications for quality:
Water Quality Specifications
Parts Grains
Per Per
Item Million U.S. Gallon
Chlorides (maximum) .......................40 2.5
Sulfates (maximum) ........................100 5.9
Total Dissolved Solids (maximum) ...340 20
Total Hardness..............................170 10
pH Level................................................5.5-9.0
ENGINE COOLANT SPECIFICATIONS
Ethylene Glycol Concentrate (Antifreeze):
IMPORTANT: Do not use cooling system sealing
additives or use antifreeze that contains
sealing additives.
The use of John Deere coolant products is strongly
recommended.
If John deere coolant products are not used, other low
silicate ethylene glycol base coolants for heavy-duty
diesel engines may be used when mixed with quality
water and supplemental coolant additives, (SCAs), if
they meet one of the following specifications:
* ASTM D5345 (prediluted coolant)
* ASTM D4985 (coolant concentrate) in a 40%
to 60% mixture of concentrate with quality water.
Coolants meeting these specifications require addition
of supplemental coolant additives, (SCAs), formulated
for heavy-duty diesel engines, for protection against
corrosion and cylinder liner erosion and pitting.
IMPORTANT: Never use automotive-type coolants, (such as
those meeting ASTM D3306 or ASTM D4656).
These coolants do not contain the correct
additives to protect heavy-duty diesel
engines. They often contain a high concentra
tion of silicates and may damage the engine
cooling system.
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