TSE DPT40-B, Owner'S Manual

Page: 88 / 472

Fuels, Lubricants, and Coolants
DX,COOL19 -19-15MAY13-1/1
DX,COOL6 -19-15MAY13-1/1
Water Quality for Mixing with Coolant Concentrate
Engine coolants are a combination of three chemical
components: ethylene glycol (EG) or propylene glycol
(PG) antifreeze, inhibiting coolant additives, and quality
water.
Water quality is important to the performance of the
cooling system. Distilled, deionized, or demineralized
water is recommended for mixing with ethylene glycol and
propylene glycol base engine coolant concentrate.
All water used in the cooling system should meet the
following minimum specifications for quality:
Chlorides <40 mg/L
Sulfates <100 mg/L
Total solids <340 mg/L
Total dissolved I hardness <170 mg/L
pH 5.5—9.0
IMPORTANT: Do not use bottled drinking water
because it often contains higher concentrations
of total dissolved solids.
Freeze Protection
The relative concentrations of glycol and water in the
engine coolant determine its freeze protection limit.
Ethylene Glycol Freeze Protection Limit
40% -24 °C (-12 °F)
50% -37 °C (-34 °F)
60% -52 °C (-62 °F)
Propylene Glycol Freeze Protection Limit
40% -21 °C (-6 °F)
50% -33 °C (-27 °F)
60% -49 °C (-56 °F)
DO NOT use a coolant-water mixture greater than 60%
ethylene glycol or 60% propylene glycol.
Operating in Warm Temperature Climates
John Deere engines are designed to operate using
recommended engine coolants.
Always use a recommended engine coolant, even when
operating in geographical areas where freeze protection
is not required.
IMPORTANT: Water may be used as coolant in
emergency situations only.
Foaming, hot surface aluminum and iron
corrosion, scaling, and cavitation occur when
water is used as the coolant, even when
coolant conditioners are added.
Drain cooling system and refill with
recommended engine coolant as soon
as possible.
10-11 032715
PN=41