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• To start engine, press and hold the Start/Run/Stop switch in
the “Start” position. The engine will crank and attempt to start.
When the engine starts, release the switch to the run position.
• When the engine starts, move choke knob to “1/2 Choke” position until
the engine runs smoothly and then to “Run” position. If engine falters,
move choke knob to “1/2 Choke” position until the engine runs
smoothly and then to “Run” position.
Note: If engine fires, but does not continue to run,
move choke lever to “Full Choke” and repeat starting
instructions.
2.8 STOPPING THE ENGINE
• Shut off all loads, then unplug the electrical loads from
generator panel receptacles. Never start or stop the engine
with electrical devices plugged in and turned on.
• Turn “Off” the Idle Control switch (if on).
• Let engine run at no-load for several minutes to stabilize the
internal temperatures of engine and generator.
• Move Start/Run/Stop switch to “Off” position.
• Close fuel valve.
IMPORTANT: Do not overload the generator. Also, do not
overload individual panel receptacles. These outlets are protected
against overload with push-to-reset-type circuit breakers. If
amperage rating of any circuit breaker is exceeded, that breaker
opens and electrical output to that receptacle is lost. Read “Don’t
Overload the Generator” on page 9 carefully.
2.9 AUTOMATIC IDLE CONTROL
This feature is designed to greatly improve fuel economy. When
this switch is turned “On,” the engine will only run at its normal
fast governed engine speed when electrical load is connected.
When the load is removed, the engine will run at a reduced speed
of 2100 RPM. With the switch “Off,” the engine runs at the
normal fast engine speed all the time. Always have the
switch OFF when starting and stopping the engine.
2.10 COLD WEATHER OPERATION/
DE-ICER
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 generator engine is fitted with a winter/summer
valve. 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.
2.11 LOW OIL PRESSURE SHUTDOWN
SYSTEM
The engine is equipped with a low oil pressure sensor that shuts
down the engine automatically when the oil pressure drops below
10 psi. If the engine shuts down by itself and the fuel tank has
enough gasoline, check engine oil level.
2.11.1 INITIAL START-UP
A delay built into the low oil shutdown system allows oil pressure
to build during starting. The delay allows the engine to run for
about 10 seconds before sensing oil pressure.
2.11.2 SENSING LOW OIL PRESSURE
If the system senses low oil pressure during operation, the engine
shuts down.
2.11.3 RESTARTING
If you try to restart the engine within 10 seconds after it shuts
down, the engine may NOT start. The system needs 5 to 10
seconds to reset.
If you do restart the engine after such a shutdown and have not
corrected the low oil pressure, the engine runs for about 10
seconds as described above and then stops.
2.12 CHARGING A BATTERY
Ʒ
DANGER! Storage batteries give off explosive hydrogen
gas while recharging. An explosive mixture will remain
around the battery for a long time after it has been charged.
The slightest spark can ignite the hydrogen and cause an
explosion. Such an explosion can shatter the battery and
cause blindness or other serious injury.
ƽ DANGER! Do not permit smoking, open flame, sparks
or any other source of heat around a battery. Wear protective
goggles, rubber apron and rubber gloves when working
around a battery. Battery electrolyte fluid is an extremely
caustic sulfuric acid solution that can cause severe burns. If
spill occurs flush area with clear water immediately.
Your generator has the capability of recharging a discharged 12
Volt automotive or utility style storage battery. Do not use the
unit to charge any 6 Volt batteries. Do not use the unit
to crank an engine having a discharged battery.
Section 2 — Operation
Commercial-Industrial-Residential Portable Generator System
25
Section 7 — Exploded Views and Parts Lists
Commercial-Industrial-Residential Portable Generator System
GT-990 & GT-760 Engine (Page 1) – Drawing No. 0E8589-J
ITEM PART NO. QTY. DESCRIPTION
1 0C5729 1 ASSEMBLY, CRANKCASE HOUSING
WITH SLEEVE
2 0E9843 1 SEAL, 38 I.D. CRANKSHAFT
3 090388 3 SCREW, TAPTITE M6-1.0 X 12 BP
4 0C5372 1 ASSEMBLY, BREATHER
5 0C3005 1 GASKET, BREATHER COVER
6 0E3372B 1 SEPARATOR, OIL BREATHER
7 0D8067A 1 ASSEMBLY, HEAD #1
8 071983 4 RETAINER, PISTON PIN 20
9 0D5269 1 ROCKER, COVER
10 043790 1 BARBED EL 90 3/8NPT X 3/8
11 0E2950 2 PISTON, LC (GT-990)
0E2985 2 PISTON, HC (GT-760)
12 021533 2 SET, PISTON RING 90MM
13 0E1466 2 PIN PISTON
14 0D4041 1 ASSEMBLY, CAMSHAFT & GEAR
15 0D4788 2 PLUG STD PIPE 3/8 STEEL SQ HD
16 093064 1 ASSEMBLY, OIL FILL CAP
17 0C2977 1 GASKET, CRANK CASE
18 0C5943 1 SEAL, OIL PASSAGE
19 0E4357E 1 ASSEMBLY, CRANKSHAFT
HORIZONTAL DIRECT DRIVE
(GT-990)
0E4356E 1 ASSEMBLY, CRANKSHAFT
HORIZONTAL DIRECT DRIVE
(GT-760)
20 0E3223 2 ASSEMBLY, CONNECTING ROD
(GT-990)
0E3222 2 ASSEMBLY, CONNECTING ROD
(GT-760)
21 0D2157 2 SCREW SHC M6-1.0 X 50 G8.8
22 0E6098 1 SCREEN, OIL PICKUP
23 0D4123A 1 ASSEMBLY, OIL PUMP
24 078699E 2 SLEEVE, SEAMED DOWEL 10 DIA.
25 0C3011 2 COVER, OIL RELIEF
26 0C3009 2 SPRING, OIL RELIEF
27 0C3010 2 BALL, 1/2D OIL RELIEF
28 093873 2 WASHER, LOCK RIB M6
29 0C5315 1 GEROTOR, OUTER
30 0C5998 1 CLAMP, OIL TUBE
31 0D4497 1 PLUG-CRANKCASE GOVERNOR
BORE
32 0C3971E 1 ASSEMBLY, DIPSTICK WITH
HANDLE
33 0D3745 1 TUBE, DIPSTICK
34 0C3027 3 O-RING, OIL CLR
35 0E9842 1 SEAL, 42 I.D. CRANKSHAFT
ITEM PART NO. QTY. DESCRIPTION
36 0C5731 1 ASSEMBLY, HOUSING COVER
WITH SLEEVE
37 0C3006 11 SCREW, HHFC M10-1.5 X 55
38 080318 8 SCREW HHFC M6-1.0 X 25
39 0C8808 2 HOOK, LIFTING
40 0C2981C 1 ROCKER, COVER
41 0C2979 2 GASKET, VALVE COVER
42 086515 8 KEEPER, VALVE SPRING
43 0D2274 4 RETAINER, VALVE SPRING
44 0D3867 4 SPRING, VALVE
45 078672 2 SEAL, VALVE STEM D7
46 0C5371 4 WASHER, VALVE SPRING
47 072694 4 STUD, ROCKER ARM PIVOT
48 0C3027 2 O-RING, 3/8" X 1/2"
49 0D5313 4 ROCKER ARM
50 0D3998 4 NUT, HEX M8-1.0 GB YELLOW
CHROME
51 0D6024 2 PLATE, PUSH ROD GUIDE
52 0C2976 12 SCREW HHFC M8-1.25 X 65
53 086516 2 VALVE, EXHAUST
54 0C2229 2 VALVE, INTAKE
55 083897 4 TAPPET, SOLID
56 0D8067B 1 ASSEMBLY, HEAD #2
57 0D9853D 4 PUSHROD 147
58 0C2978 2 GASKET, HEAD
59 0D6008 1 KIT GEAR COVER
60 0D4010 1 KIT GASKET
61 0D6007 1 KIT PISTON & RINGS
62 0D4012 1 KIT BREATHER ASSEMBLY
63 0D8675A 1 KIT HEAD ASSEMBLY CYLINDER 1
64 0D8675B 1 KIT HEAD ASSEMBLY CYLINDER 2
65 0D4015 1 KIT OIL RELIEF
Item 59 (Kit) includes items 3, 30, 35, 65
Item 60 (Kit) includes items 2, 5, 17, 18, 34, 35, 40, 57, 139, 153.
Item 61 (Kit) includes items 8, 11, 12, 13
Item 62 (Kit) includes items 4, 5, 6
Item 63 (Kit) includes items 7, 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52,
53, 54, 57, 58
Item 64 (Kit) includes items 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53,
54, 56, 57, 58
Item 65 (Kit) includes items 25, 26, 27