MULTIQUIP DLW400ESA4 Operation Manuals page 46

FLUSHING OUT RADIATOR AND REPLACING
COOLANT
WARNING
DO NOT remove the pressure cap from the
radiator when the engine is hot! Wait until
the coolant temperature is below 120°F
(50°C) before removing pressure cap.
Heated coolant spray or steam can cause severe
scalding and personal injury.
1. Remove radiator cap.
2. Remove the coolant drain bolt and o-ring (Figure 57),
then allow the coolant to drain into a suitable container
3. If equipped, remove the overflow tank. Drain and clean
overflow tank.
4. Replace the overflow tank if necessary.
5. Check hoses for softening and kinks. Check clamps
for signs of leakage.
6. Flush the radiator by running clean tap water through
radiator until signs of rust and dirt are removed. DO
NOT clean radiator core with any objects, such as a
screwdriver.
7. Replace with coolant as recommended by the engine
manufacturer. Reference Table 4 for coolant capacity.
8. Reinstall coolant drain bolt with o-ring and tighten
securely.
COOLANT (ANTIFREEZE/SUMMER COOLANT/
WATER)
Kubota recommends antifreeze/summer coolant for use in their
engines, which can be purchased in concentrate (and mixed
with 50% demineralized water) or pre-diluted. See the Kubota
Operation and Maintenance Manual for further details.
WARNING
If adding coolant/antifreeze mix to the
radiator, DO NOT remove the radiator cap
until the unit has completely cooled. The
possibility of hot! coolant exists which can
cause severe burns.
PAGE 46 — DLW400ESA4 WELDER/GENERATOR • OPERATION MANUAL — REV. #0 (03/14/18)
Day-to-day addition of coolant is done via the radiator.
When adding coolant to the radiator, DO NOT remove the
radiator pressure cap until the unit has completely cooled.
Reference Table 4 for coolant capacity.
OPERATION IN FREEZING WEATHER
When operating in freezing weather, be certain the proper
amount of antifreeze has been added as referenced in
Table 26.
Table 26. Anti-Freeze Operating Temperatures
Vol % Freezing Point
Anti-
°C
Freeze
50 -37
RADIATOR CLEANING
The radiator (Figure 58) should be sprayed (cleaned) with
a high pressure washer when excessive amounts of dirt
and debris have accumulated on the cooling fins or tube.
When using a high pressure washer, stand at least 5 feet
(1.5 meters) away from the radiator to prevent damage to
the fins and tube.
Figure 58. Radiator Cleaning
MAINTENANCE
Boiling Point
°F °C °F
-34 108 226