JLG G6-42P Service Manual - Manual (Page 131)

REPLENISHING SUPPLEMENTAL COOLANT ADDITIVES (SCAs) BE-
TWEEN COOLANT CHANGES
IMPORTANT: Do not add supplemental coolant additives
when the cooling system is drained and
refilled with John Deere ANTIFREEZE/
SUMMER COOLANT or John Deere
COOL-GARD.
Through time and use, the concentration of coolant
additives is gradually depleted during engine operation.
Periodic replenishment of inhibitors is required, even
when John Deere ANTIFREEZE/SUMMER COOLANT
or John Deere COOL-GARD is used. The cooling
system must be recharged with additional coolant
additives available in the form of liquid coolant condi-
tioner.
Maintaining the correct coolant conditioner
concentration (SCAs) and freeze point is essential in
your cooling system to protect against rust, liner pitting
and corrosion, and freeze-ups due to incorrect coolant
dilution.
John Deere LIQUID COOLANT CONDITIONER is
recommended as a supplemental coolant additive
in John Deere engines.
Test the coolant solution at 600 hours or 12 months of
operation using either John Deere coolant test strips or
a CoolScan analysis. If a CoolScan analysis is not
available, recharge system per instructions printed on
label of john Deere Liquid Coolant Conditioner.
IMPORTANT: ALWAYS maintain coolant at correct level and
concentration. DO NOT operate engine
without coolant for even a few minutes.
If frequent coolant makeup is required, the
glycol concentration should be checked with
JT05460 Refractometer to assure that the
desired freeze point is maintained. Follow
manufacturer’s instructions provided with
refractometer.
Add the manufacturer’s recommended concentration of
supplemental coolant additive. DO NOT add more than
the recommended amount.
The use of non-recommended supplemental coolant
additives may result in additive drop-out and gelation of
the coolant.
If other coolants are used, consult the coolant supplier
and follow the manufacturer’s recommendation for use
of supplemental coolant additives.
See ENGINE COOLANT SUPPLEMENTS earlier in
this group for proper mixing of coolant ingredients
before adding to the cooling system.
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