Onan NHC User Manual

Operation
STARTING
Most engines are equipped with a start-stop switch
and cable controlled choke and throttle.
1. Place the throttle control in the SLOW position
and the choke into the FULL choke position.
2. Turn the ignition switch on and engage starter. If
engine fails to start after 30 seconds determine
the cause. Wait one minute before recranking.
If the engine fails to start at first attempt, rust inhibitor oil used
at the factory may have fouled the plugs. Remove the plugs,
clean in a suitable solvent, dry thoroughly and reinstall. Heavy
exhaust smoke when the engine is initially started is normal
and usually caused by rust inhibitor oil.
3. When the engine starts, gradually push the choke
lever in until the engine runs smoothly.
4. Black smoke from the exhaust and a rough
running engine usually indicate over-choking.
5. To stop the engine, turn the ignition switch to the
OFF position.
AWARNING
Contact with rotating machin¬
ery can cause serious personal
injury or death . Stay clear of rotating components
and ensure that protective shields and guards are
in place and secured before operating machinery .
2. See that nothing obstructs air flow to and from
the engine.
3. Ensure that you are using the proper grade and
weight of oil for ambient temperatures. Check the
oil level each time you fill the fuel tank.
4. Check the battery water more frequently than
every 50 hours which is recommended under
normal conditions. High temperatures cause
faster evaporation.
5. Change crankcase oil and filter more frequently
than recommended under normal conditions.
BREAK-IN PROCEDURE
Controlled break-in is the ideal fitting of all internal
moving metal parts. Using the proper oil and applying
a conscientious maintenance program during this
period helps assure satisfactory service from your
Onan engine.
Maintain the proper cooling and lubrication during
break-in. Run the engine at half load for the first three
hours with intermittent periods of full load to control
engine break-in.
A CAUTION
Using the wrong grade and weight
of oil and high engine operating
temperatures during break-in can cause engine
damage.
Check the oil level at least every five operating hours.
Add oil to keep it at the proper level, but never overfill
as overfilling may cause the oil to foam and enter the
breather system.
COLD WEATHER OPERATION
When the engine is being used in temperatures below
32°F (0°C), check the following items closely:
1. Use the correct grade and weight of oil for the
temperature conditions. Change the oil only when
theengine is warm. If an unexpected temperature
drop occurs when the engine is filled with summer
oil, before starting the engine, move it to a warm
location until the oil will flow freely.
2. Use fresh fuel. Fill the fuel tank after each day’s
use to protect against moisture condensation.
3. Keep the battery in a well-charged condition.
DUST AND DIRT
1. Keep unit clean. Keep cooling system clean.
2. Service air cleaner as frequently as required.
3. Change crankcase oil and filter more often than
recommended under normal conditions.
HOT WEATHER OPERATION
When operating the engine in temperatures above
100°F (38°C), pay particular attention to the fol¬
lowing items to prevent damage:
1. K ee p the engine cooling fins clean and free of
obstruction.
ACAUTION
engine damage.
Plugged or clogged cooling fins
can cause overheating and
OUT-OF-SERVICE PROTECTION
Protect an engine that will be out-of-service for more
than 30 days as follows:
1. Run the engine until it reaches normal operating
temperature.
2. Turn off the fuel supply and run theengine until it
stops.
3. Drain oil from oil base while the engine is still
warm. Refill with fresh crankcase oil and attach a
tag stating viscosity used.
4

Onan NHC Specifications

General

Brand	Onan
Model	NHC
Category	Engine
Language	English