Generac Power Systems GTH - 990, Owner'S Manual

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5
STARTING THE ENGINE
1. Open the fuel shut-off valve, (if equipped).
2. Move choke control to Choke or Start position.
3. Push throttle to Fast position (if equipped). Operate the engine
with the throttle in Fast position.
4. Turn key to Start position (hold until engine starts, but not
more than 5 seconds). To prevent damage to starter, allow
starter to cool for one minute between attempting to restart.
5. A) If the engine FAILS TO START, go to Step 6.
B) If the engine STARTS, go to Step 7.
6. Push the choke lever to the HALF CHOKE POSITION. Repeat
step 4.
• If the engine STILL FAILS TO START, repeat Steps 1-5.
7. Move the choke lever to the Off POSITION by pushing it in or
move choke control to Run position. Allow engine to warm
up for two minutes.
NOTE:
For cold weather starting: make sure the proper engine oil is
being used.
STOPPING THE ENGINE
1. Remove load from engine.
2. Move throttle to SLOW position.
3. While still running, allow engine to cool for two minutes.
4. Turn key to OFF position.
5. Close fuel shut-off valve (if equipped).
LOW OIL PRESSURE SYSTEM
The engine is equipped with a low oil pressure switch that closes
if the pressure drops below 8 psi. This switch will function in a
variety of ways dependant on the application and manufacturer.
• The oil pressure switch could be connected to a light or an
alarm to notify the operator that the oil pressure is low. The
engine will not shut down.
WINTER/SUMMER INTAKE AIR
CONTROL (IF SO EQUIPPED)
Under certain weather conditions (temperatures below 40° F (4°
C) and a high dew point), the engine may experience icing of the
carburetor and/or the crankcase breather system. To eliminate this
problem, this engine may be fitted with a winter/summer valve
(Figure 4). This directs hot air into the carburetor during cold
weather operation. Always make sure the winter/summer valve is
in the correct location relative to the weather conditions.
Figure 4 — Winter/Summer Valve
GENERAL MAINTENANCE
RECOMMENDATIONS
PERFORMING SCHEDULED MAINTENANCE
It is important to perform service as specified in the Maintenance
Schedule for proper engine operation, and to ensure that the
engine complies with the applicable emission standards for the
duration of its useful life. Service and repairs may be performed
by any capable person or repair shop. Additionally, emissions criti-
cal maintenance must be performed as scheduled in order for the
Emissions Warranty to be valid. Emissions critical maintenance
consists of servicing the air filter and spark plugs in accordance
with the Maintenance Schedule.
CHECKING THE OIL LEVEL
See the "BEFORE STARTING THE ENGINE" section for information
on checking the oil level. The oil level should be checked before
each use, or at least every eight (8) hours of operation. Keep the
oil level maintained.
CHANGING THE OIL AND OIL FILTER
The engine is equipped with an oil filter. Change the oil and filter
after the first eight (8) hours of operation. Change the oil and oil
filter every 100 hours thereafter. If using this engine under dirty
or dusty conditions, or in extremely hot weather, change the oil
more often.
Use the following instructions to change the oil while the engine
is still warm:
1. Clean the area around the oil drain plug, remove the plug and
drain the oil completely into a suitable container (Figure 5).
2. When the oil is drained, install and tighten the oil drain plug.
Operation