MAINTENANCE
SECTION 5
Page 21
DRESSTA
TD-15H
COOLING SYSTEM
5.7. Coolant Filter
1. Coolant Filter 2. Shut-off Valve
Coolant testing for conditioner concentration
Coolant testing for DCA4 concentration should be performed periodically before coolant filter
replacement to determine proper capacity of the filter to be applied. CC2626 test kit of the filter
manufacturer is designed for this purpose.
Replenishing coolant conditioner
Replenishing coolant conditioner is performed by periodical replacement of filters containing DCA4
inhibitor protecting the cooling system against corrosion and cavitation erosion of the cylinder
sleeves and coolant pump blades.
Prior to installation of a new coolant filter close the shut-off valve on the coolant filter head (OFF).
Upon the installation of a new coolant filter open the shut-off valve (ON).
NOTE: Mixing of DCA4 and other supplemental coolant additives is not recommended because
there is currently no test kit available to measure concentration levels with mixed chemical
solutions.
5.8.4. RADIATOR CAP
General
Radiator cap (2) seals the coolant filler opening of the radiator. Positive sealing requires a cap
gasket and its contacting surfaces in good condition, and a properly tightened cap.
Radiator cap cover (1) incorporates a pressure relief valve that keeps the pressure of coolant at
40 – 55 [kPa] in the top tank of the radiator.
IMPORTANT: Operating a machine without the radiator cap, or with a cap without a relief valve
set to operate at the correct pressure can cause damage.
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