Generac Power Systems MAC400HC, Owner'S Manual

18

Owner’s Manual for Flameless Heat Cart

Maintenance

Figure 4-2. Oil Fill Cap Locations

9.

Fill oil pan to specified level.

10.

Replace filler cap.

NOTE: 

Do not overtighten filler cap. Overtightening may

damage filler cap.

11.

Start and run the engine for five minutes. Verify
there are no leaks.

12.

Stop the engine and let cool for approximately 10
minutes. Verify the oil level is correct. (See 

Drain-

ing and Refilling the Oil

.) Repeat steps 8–10 until

oil is properly filled.

NOTE: 

Do not overfill oil pan. Overfilling may result in

white exhaust smoke, sudden engine overspeed, or
engine damage.

Adding Coolant

If coolant level is below the filler neck, coolant must be
added. (See 

Coolant Recommendations

.) Proceed as

follows to add coolant:

1.

Verify engine is stopped and cooled.

2.

Remove radiator cap.

3.

Fill radiator slowly with coolant until it comes up to
filler neck.

4.

Operate engine for approximately five minutes at a
low idle speed to purge the air in the coolant circuit.

NOTE: 

Coolant level will drop.

5.

Stop the engine and replenish with coolant once
cooled.

Maintenance Schedule

Periodic inspection, service, and maintenance of this unit
is critical to ensuring reliable operation. The following is
the manufacturer’s recommended maintenance sched-
ule. The maintenance items need to be performed more
frequently if the unit is used in severe applications (such
as very high or very low ambient conditions or extremely
dirty or dusty environments). Use the unit hour meter or
calendar time, whichever occurs first, from the previous
maintenance interval to determine the next required
maintenance interval. 

NOTE: 

Some checks are based on hours of operation.

Follow all applicable safety alerts in this manual or the
engine service manual before performing any mainte-
nance checks or service.
This maintenance schedule reflects the minimum tasks
needed to verify the unit remains operational. Some of
the tasks can be performed by an authorized operator,
and others must be performed by a GMP ASD.

NOTE: 

An authorized operator is one who has been

trained by a GMP ASD in proper operation and inspec-
tion of this unit.

004704

B

(000149)

DANGER

Risk of poisoning. Do not use mouth to siphon 
coolant. Doing so will result in death or serious 
injury.

(000154)

WARNING

Risk of burns. Do not open coolant system
until engine has completely cooled. Doing so 
could result in serious injury.

(000165a)

CAUTION

Risk of overheating. Do not use any chromate base 
rust inhibitor with propylene glycol base antifreeze, 
boosters, or additives. Doing so will cause overheating
and possible equipment damage.