MQ Power WHISPERWATT DCA20SPXU4F, Operation Manual

PAGE 26 — DCA20SPXU4F • OPERATION MANUAL — REV. #3 (09/18/19)

INSPECTION/SETUP

Day-to-day addition of coolant is done from the recovery 

tank. When adding coolant to the radiator, 

DO NOT

 remove 

the radiator cap until the unit has completely cooled. See 

Table 8 for engine, radiator, and recovery tank coolant 

capacities. Make sure the coolant level in the recovery tank 

is always between the “H” and the “L” markings.

Operation in Freezing Weather

When operating in freezing weather, be certain the proper 

amount of antifreeze (Table 9) 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.

AIR CLEANER

Periodic cleaning/replacement is necessary. Inspect air 

cleaner in accordance with the 

Isuzu Engine Owner’s 

Manual

.

Table 8. Coolant Capacity

Engine and Radiator

2.3 gal (8.8 liters)

Reserve Tank

N/A

Table 9. 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%.

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 

John 

Isuzu Engine Owner’s Manual.

The fan belt tension is proper if the fan belt bends 10 to 15 

mm (Figure 22) when depressed with the thumb as shown 

below. 

Figure 22. Fan Belt Tension 

BATTERY 

This unit is of negative ground 

DO NOT

 connect in reverse. 

Always maintain battery fluid level between the specified 

marks. Battery life will be shortened, if the fluid level are 

not properly maintained. Add only distilled water when 

replenishment is necessary.

DO NOT

 over fill. Check to see whether the battery 

cables are loose. Poor contact may result in poor starting 

or malfunctions. 

Always

 keep the terminals firmly 

tightened. Coating the terminals with an approved battery 

terminal treatment compound. Replace battery with only 

recommended type battery. The battery type used in this 

generator is BCI Group 27.
The battery is sufficiently charged if the specific gravity 

of the battery fluid is 1.28 (at 68° F). If the specific gravity 

should fall to 1.245 or lower, it indicates that the battery is 

dead and needs to be recharged or replaced.
Before charging the battery with an external electric source, 

be sure to disconnect the battery cables.

  CAUTION

NEVER 

place hands near the belts or fan 

while the generator set is running.