PAGE 26 — DIS185SSI4F AIR COMPRESSOR • OPERATION MANUAL — REV. #0 (12/19/16)
COOLANT (ANTIFREEZE/SUMMER COOLANT/
WATER)
Isuzu 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
Isuzu
Engine Owner’s Manual
for further details.
Day-to-day addition of coolant is done from the coolant
recovery tank. When adding coolant to the radiator,
DO
NOT
remove the radiator cap until the unit has completely
cooled. See Table 6 for engine, radiator, and recovery
tank coolant capacities. Make sure the coolant level in the
recovery tank is always between the “
FULL
” and “
LOW
”
markings.
1. Verify that the coolant level in the coolant recovery tank
is between the
FULL
and
LOW
markings as shown in
Figure 15.
Figure 15. Coolant Recovery Tank
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.
NOTICE
Normally, only the coolant level in the recovery tank
needs to be checked. However, the radiator cap should
be opened once a week to verify that coolant is visible
(full) in the radiator.
Table 6. Coolant Capacity
Engine and Radiator
2.1 gal (7.4 liters)
Reserve Tank
N/A
LOW
FULL
ADD
INSPECTION/SETUP
2. If coolant level is
LOW,
add coolant immediately and
fill to the
FULL
marking on the coolant recovery tank.
Operation in Freezing Weather
When operating in freezing weather, be certain the proper
amount of antifreeze (Table 7) has been added.
CLEANING THE RADIATOR
The engine may overheat if the radiator fins become
overloaded with dust or debris. Periodically clean the
radiator fins with compressed air. Cleaning inside the
machine is dangerous, so clean only with the engine turned
off
and the
negative
battery terminal disconnected.
FAN BELT TENSION
A slack fan belt may contribute to overheating, or to
insufficient charging of the battery. Inspect the fan belt for
damage and wear and adjust it in accordance with the
Isuzu Engine Owner’s Manual.
The fan belt tension is proper if the fan belt bends 10 to
15 mm (Figure 16) when depressed with the thumb as
shown below.
Figure 16. Fan Belt Tension
Table 7. Anti-Freeze
Operating Temperatures
Vol % Anti-Freeze
Freezing Point
°C
°F
50
-37
-34
NOTICE
When the antifreeze is mixed with water, the antifreeze
mixing ratio
must be
less than 50%.
CAUTION
NEVER
place hands near the belts or fan
while the air compressor is running.
