Generac Power Systems GTH - 990, Owner'S Manual

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PRODUCT SPECIFICATIONS
Model GTH 990
Bore 90mm
Stroke 78mm
Valve Clearance 0.05 - 0.10mm
(.002 - .004 in.)
Displacement 992cc
Maximum Tilt Angle While Operating 15°
Weight 53.9 kg - 119 lbs.
OIL CAPACITIES
Model GTH 990
Oil Capacity with Oil Filter 2.2 L (2.3 qt.)
Oil Capacity without Oil Filter 1.9 L (2.0 qt.)
SERVICE PARTS
Part Number
Spark Plug 0E6037A
Oil Filter 070185H
Air Cleaner Element 0D9723
Air Pre-cleaner 0D4511
Air Filter, Primary (Canister Style, large) 0E3557
Air Filter, Safety (Canister Style, small) 0E3656
TROUBLESHOOTING
PROBLEM CAUSE CORRECTION
Engine will not start; or starts and
runs rough.
1. Dirty air cleaner.
2. Out of gasoline.
3. Stale gasoline.
4. Spark plug wire not connected to spark
plug.
5. Bad spark plug.
6. Water in gasoline.
7. Overchoking.
8. Low oil level.
9. Excessive rich fuel mixture.
10. Intake valve stuck open or closed.
11. Engine has lost compression.
1. Clean or replace air cleaner.
2. Fill fuel tank.
3. Drain fuel tank and carburetor, fill with fresh
fuel.
4. Connect wire to spark plug.
5. Replace spark plug.
6. Drain fuel tank and carburetor, fill with fresh
fuel.
7. Put choke knob to NO CHOKE position.
8. Fill crankcase to proper level.
9. Contact Authorized Service Facility.
10. Contact Authorized Service Facility.
11. Contact Authorized Service Facility.
Engine shuts down during operation. 1. Out of gasoline.
2. Fault in engine. 1. Fill fuel tank.
2. Contact Authorized Service Facility.
Engine lacks power. 1. Dirty air filter.
2. Engine needs to be serviced. 1. Replace air filter.
2. Contact Authorized Service Facility.
Engine "hunts" or faulters. 1. Choke is opened too soon.
2. Carburetor is running too rich or too lean.
3. Governor or speed control system out of
adjustment.
1. Move choke to halfway position until engine
runs smoothly.
2. Contact Authorized Service Facility.
3. Contact Authorized Service Facility.
Troubleshooting