Northern Lights NL673L, Operator'S Manual

Page: 25 / 40

ONL673L 7/13
23
Servicing
SP14. COOLING SYSTEM FLUSHING
1. Flush the cooling system every 2500 hours or every
12 months, whichever comes fi rst.
2. Cooling System Flushing:
a. Remove radiator cap and open drain cocks on
radiator and engine block.
b. Pour clean water into radiator until water coming
from radiator is clear of discoloration.
c. Close the radiator drain and continue fl ushing until
water from engine drain is clear.
d. Open all drain cocks and drain completely.
e. Close drain cock and refi ll with recommended
coolant mixture.
f. Clean fi ns on radiator.
3. Coolant Specifi cations (marine and industrial):
Use 50% water / 50% ethylene glycol antifreeze
mix. Antifreeze mixture is recommended as a good
year-round coolant.
4. Check hoses and connections and repair any leakage.
SP16. CLEAN RADIATOR
1. Remove debris from radiator fi ns daily.
2. In very dusty applications, clean the radiator with
compressed air or steam cleaner every 100 hours.
Clean in the reverse direction of the airfl ow.
GENERATOR ENDS
The maintenance and operation recommendations
for the generator end are located on pages 19-22
under the heading “AC Generator”.
ELECTRICAL SYSTEM - GENERAL
1. Never switch battery switch off or break the circuit
between the alternator and batteries while the engine
is running. Regulator damage can result.
2. Do NOT reverse the polarity of battery cables when
installing the battery.
3. When welding on the unit, disconnect the AC & DC
voltage regulator and battery. Isolate the leads.
4. Disconnect the battery cables when servicing the
D.C. alternator.
5. Never test with a screwdriver, etc., against any ter-
minal to see if it emits sparks.
6. Do not polarize the alternator or regulator.
7. A D.C. circuit breaker protects your control panel
and wiring harness. It is located in the side of the
generator junction box.