Generac Power Systems GTH990 User manual

GTH990
Engine Parts Manual
Model: 005055-1

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15
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14
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12
7
8
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3
27
29 28
32
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65
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1
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38
37 36
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3
77
40
2
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26
10
4
34
25
11
30
20
76
16A
16B
16A
54
53
56
55 74
75 46
44
31
GTH990 OHVI SERIES ENGINE Model 005055-1
23

23
ITEM PART NO. QTY. DESCRIPTION
1 0C57290SRV 1 ASSEMBLY, CRANKCASE HOUSING WITH
SLEEVE
2 0E9843 1 SEAL, 38 I.D. CRANKSHAFT FLYWHEEL
SIDE
3 090388 3 SCREW, HHTT M6-1.0 X 12 YC
4 0C5372 1 ASSEMBLY, BREATHER
5 0C3005 1 GASKET, BREATHER COVER
6 0E3372B 1 SEPARATOR, OIL BREATHER
7 0D8067A 1 ASSEMBLY, HEAD #1 G&S
8 071983 4 RETAINER, PISTON PIN 20
9 0C2981C 1 ROCKER, COVER W/BARB FITTING
10 045761A 4 STUD M8-1.25/10MM X 30 G5 ZINC
11 0E2950 2 PISTON, HC
12 0215330SRV 2 SET, PISTON RING 90MM
13 0E1466 2 PIN PISTON D20
14 0D4041 1 ASSEMBLY, CAMSHAFT & GEAR
15 0C2983 1 SHAFT, GOVERNOR
16A 0C2985A 2 ROLLER BEARING, GOVERNOR PLATE
16B 0C2985B 1 ROLLER BEARING, GOVERNOR
17 0D4042 1 ASSEMBLY, GOVERNOR GEAR
18 0A7811 1 SPOOL, GOVERNOR MACHINED
19 0C2977 1 GASKET, CRANK CASE
20 0C5943 1 SEAL, OIL PASSAGE
21 0E4357C 1 ASSEMBLY, CRANKSHAFT HORIZ L & G
22 0E3223 2 CONNECTING ROD
23 0D2157 2 SCREW, SHC M6-1.0 X 50 G8.8
24 0E6098 1 SCREEN, OIL PICKUP
25 0D4123A 1 ASSEMBLY, OIL PUMP
26 0E8152 1 O-RING .49 X .07 THICK
27 0C3011 2 COVER, OIL RELIEF
28 0C3009 2 SPRING, OIL RELIEF
29 0C3010 2 BALL, 1/2D OIL RELIEF
30 093873 2 WASHER, LOCK M6 RIBBED
31 0F5458 1 SCREW, PLASTITE HI-LOW #10
32 0C5998 1 CLAMP, OIL TUBE
33 0D1667 1 ARM, GOVERNOR
34 0C2991 2 E-RING, GOVERNOR ARM
35 0C2988 1 THRUST WASHER, GOVERNOR
36 0C2992 1 BUSHING, GOVERNOR LOWER
37 0F2664C 1 ASSEMBLY, DIPSTICK WITH HANDLE
ITEM PART NO. QTY. DESCRIPTION
38 0C5305 1 TUBE, DIPSTICK
39 0C3027 1 O-RING, OIL CLR 3/8 X 1/2
40 0E9842 1 SEAL, 42 I.D. CRANKSHAFT PTO SIDE
41 0C5731 1 ASSEMBLY, HOUSING COVER WITH
SLEEVE
42 0C3006 10 SCREW, HHFC M10-1.5 X 55
43 080318 8 SCREW HHFC M6-1.0 X 25
44 0930640SRV 1 ASSEMBLY, OIL FILL CAP
46 0D5269 1 ROCKER, COVER WITH OIL FILL
47 0C2979 2 GASKET, VALVE COVER
48 086515 8 KEEPER, VALVE SPRING
49 0D2274 4 RETAINER, VALVE SPRING
50 0D3867 4 SPRING, VALVE
51 078672 2 SEAL, VALVE STEM D7
52 0C5371 4 WASHER, VALVE SPRING
53 072694 4 STUD, ROCKER ARM PIVOT
54 0D3998 4 NUT HEX M8-1.0 G8 YEL CHR
55 0C3027 2 O-RING, 3/8" X 1/2"
56 0D5313 4 ROCKER ARM
57 0D6024 2 PLATE, PUSH ROD GUIDE
58 0C2976 12 SCREW HHFC M8-1.25 X 65
59 086516 2 VALVE, EXHAUST
60 0C2229 2 VALVE, INTAKE
61 083897 4 TAPPET, SOLID
62 0D8067B 1 ASSEMBLY, HEAD #2 G&S
63 0D9853D 4 PUSHROD, 147
64 0C2978 2 GASKET, HEAD
65 0D4788 2 PLUG,STD PIPE 3/8
66 0D40100ESV 1 KIT GASKET
67 0E29500SRV 1 KIT PISTON & RINGS
68 0D40120ESV 1 KIT BREATHER ASSEMBLY
69 0D40130SRV 1 KIT GOVERNOR ASSEMBLY
70 0D8675ASRV 1 KIT HEAD ASSEMBLY CYLINDER 1
71 0D8675BSRV 1 KIT HEAD ASSEMBLY CYLINDER 2
72 0D40150SRV 1 KIT OIL RELIEF
73 0D40160SRV 1 KIT GEAR COVER
74 0C4138 2 GASKET, EXHAUST PORT
75 0F0462 4 NUT, HEX W/TOOTH WSHR M8-1.25
76 0C2993 1 SEAL, GOVERNOR SHAFT
77 0D6147 5 SCREW, HHFC M6-1.0 X 10
Model 005055-1 GTH990 OHVI SERIES ENGINE

45
"D"
"B"
TO #187
"B" "C"
"C"
90
91
92
93
94
95
96
97
98
99
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101
102
103
104
106
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125 126
127 128
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136 137
138
139 140
141
142
143
144
146
148
147
148 149
150
99
151
152 137
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155
156
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165
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122
167
170
170
169
122
105
188
98
169
170
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175
176
177
178
180
181 182
183
184
185 186
187
122
99
168
190
191
192
193
196
197
198
194B
TO #92
TO #165
TO #1
TO #156
194C
194A
TO #156
TO #187
189
TO #144
TO #187
194D
"D"
GTH990 OHVI SERIES ENGINE Model 005055-1

45
ITEM PART NO. QTY. DESCRIPTION
90 0C9911 1 MANIFOLD, INTAKE HORIZONTAL 2-BARREL
91 0D4023 1 GASKET, MANIFOLD TO CARB GTH990
92 0E9995 1 CARBURETOR, GTH990
93 0D4626 1 GASKET, AIRBOX TO SPCR/CARB GTH990
94 0D6021 4 STUD, METRIC
95 049821 4 SCREW, SHC M8-1.25 X 30
96 070006 4 WASHER, LOCK M8
97 070008 4 WASHER, FLAT M8
98 030340R 2 HOSE, 0.25 ID
99 048031C 4 CLAMP, HOSE BAND ¼
100 086061G 1 SLEEVING, ½" ID X 3" LG
101 0D9960 1 ROD, CHOKE
102 0E9271 1 BRACKET, THROTTLE GTH990
103 022152 1 WASHER, LOCK #10
104 036933 1 SCREW, PPHM #10-32 X 3/8
105 022158 1 NUT, HEX #10-32 STEEL
106 0F1672 2 BOLT, GOVERNOR LINK SHOULDER
107 0E8724 1 ROD, GOVERNOR
108 0E9137 1 ASSY, SPEED CONTROL ROD
109 0E9192 1 BUSHING, REAR SPEED CONTROL
110 0E8920 1 BRACKET, THROTTLE ROD SUPPORT
111 0D9513 1 SPRING, GOVERNOR ADJUSTMENT
112 0E8966 1 ASSEMBLY, GOVERNOR LEVER
113 0E9046 1 BELLCRANK, CHOKE
114 0D1366 1 BUSHING, GOVERNOR ROD
115 0E9253 1 ROD,BELLCRANK TO CHOKE LEVER
116 0F4363 1 SPRING, CHOKE RETURN
117 0F2734 1 BELLCRANK, THROTTLE-CHOKE
118 0F4360 2 SCREW, HHTT M4-0.7 X 6 BP
119 0F2652 1 STUD, THROTTLE CONTROL
120 0F2651 1 BUSHING, THROTTLE CONTROL
121 0E9004 1 PANEL, CONTROL FACE PLATE
122 045756 21 SCREW, HHTT M6-1.0 X 10 YELLOW
CHROME
123 0F0710 1 RIVET, POP 0.125 X 0.337 STEEL
124 0E9112B 1 BRACKET, BOWDEN CABLE LOWER
125 049226 6 WASHER, LOCK #10
126 045770 6 SCREW, HHC M5-0.8 X10 G8.8
127 0D9861 1 SCREW, HHC W/PHILLIPS M5-0.8 X 30
128 0D3751 1 SPRING, IDLE RETURN
129 037398 1 NUT, HEX LOCK #10-32 NY INS
130 0F4362 1 WASHER, WAVE
131 0E8137 1 LEVER, THROTTLE GTH990
132 0E8357 1 LEVER, CHOKE GTH990
133 0E9112A 1 BRACKET, BOWDEN CABLE UPPER
134 0E4190 6 CLAMP, 3/16" COATED CABLE
135 0F5579 6 SCREW, HHC W/SHLDR M5-0.8 X 20
136 0D1142A 1 WRAPPER, LOWER CYLINDER 2
137 0D6147 2 SCREW, HHFC M6-1.0 X 10mm
138 0D1143 1 WRAPPER, UPPER CYLINDER 2
139 022264 2 WASHER, LOCK M4
140 0D6142 2 SCREW, PPHM M4-0.7 X 40
141 0C4147 1 PUMP, PULSE
142 0D5399A 1 ELBOW, RUBBER 90 DEGREE
143 0E7585 2 SPARKPLUG
144 0E4271 1 STARTER, DELCO REMY SD80
ITEM PART NO. QTY. DESCRIPTION
146 061906 2 SCREW, HHC M8-1.25 X 85 G8.8
147 022145 1 WASHER, FLAT M8
148 022129 3 WASHER, LOCK M8-5/16
149 0F5467 1 NUT, HEX M8-1.25 YELLOW ZINC
150 0F0106 1 FILTER, FUEL DONALDSON
151 0E0124 1 END CAP L-BLUE
152 0C3018 1 WRAPPER, UPPER CYLINDER 1
154 0E6043 2 SCREW, THTT M5-0.8 X 8 ZP
155 0C3019 1 WRAPPER, LOWER CYLINDER 1
156 0C3025 1 SWITCH, OIL PRESSURE
157 0C7292 1 NIPPLE, ¾"-16 UNF
158 070185B 1 FILTER, OIL BLACK 75mm LONG
159 035461 2 BARBED STR 1/4NPT X 3/8
160 0F6301 4 CLAMP, HOSE OETIKER 16.5mm
161 0C9806 2 HOSE, 3/8" I.D. X 6" LONG
162 0C3043 2 GASKET, MANIFOLD / PORT
163 0C3026 1 COOLER, OIL
164 0C9764 4 PLASTITE, ¼-15 X ¾
165 0E4997 1 CONNECTOR, GROUND WIRE
166 0F1153B 1 STATOR, OUTLINE W/LUGS-14.25"
167 0F1170C 1 PLATE, BACKING GT990 W/REGULTR
CUTOUT
168 048031G 1 CLAMP, HOSE
169 022097 4 WASHER, LOCK M6-1/4
170 092079 8 SCREW, HHTT M6-1.0 X 25 BP
171 0E7743 1 ASSY, IGNITION COIL 270mm CYLINDER 1
172 0C3052 1 ASSY, IGNITION COIL GV-990 CYLINDER 2
173 0F1177 1 ASSEMBLY, GROUND WIRE
174 0E0116 1 ASSEMBLY, FLYWHEEL W/LC MAG FRNT PTO
175 0C3031A 1 FAN, FLYWHEEL PTO SHAFT VERSION
NYLON
176 0D9560 1 CLAMP, FLYWHEEL FAN FRONT PTO
177 0C3033 1 WASHER, M24
178 0C3034 1 NUT, HEX M24
180 0A5992 4 WASHER, SHAKEPROOF INT M8 SS
181 048571 4 SCREW, HHC M8-1.25 X 10 G8.8
182 0F1169F 1 HOUSING, BLOWER HOR GASOLINE
183 0C8566 4 SCREW, HHC M6-1.0 X 20
184 0C9763 4 NUT, GROMMET ¼ PLUG
185 0D9684A 1 SCREEN, ROTATING NO PTO
186 0D7115 4 SCREW, #10 SHEET METAL
187 0A2702 1 REGULATOR, VOLTAGE (20A)
188 082774 1 KEY, WOODRUFF 4 X 19D
189 0F3202 1 HS HARNESS; 4 PIN FEMALE
190 0E6424 1 HOSE, BREATHER GTH990 L&G
191 048031G 1 HOSE, CLAMP GREEN
192 0C5894 1 CLAMP, FUEL LINE 1/4
193 0E8388 4 NUT, HEX FLANGE WHIZ M6-1.0
194A 022471 1 NUT, HEX #8-32
194B 022264 1 WASHER, LOCK #8-M4
194C 0F2094 1 SCREW, PPHM M3-0.5 X SEMS
194D 0F1150 1 HOUSING, CONN PACKARD 56 SERIES
196 0E3146 4 SPACER, ROTATING SCREEN GUARD
197 0C5136 4 KNOB, AIR CLEANER
198 0D7815A 1 ASSY, ROTATING SCREEN GUARD
Model 005055-1 GTH990 OHVI SERIES ENGINE

67
AIR CLEANER ASSEMBLY
MUFFLER MOUNTING
213
214
215
216
138(REF)
182(REF)
152(REF)
10 (REF)
183(REF)
183(REF)
217
74 (REF)
75 (REF)
210
200 (REF)
210
201
206
211
208
209
205
92 (REF)
193 (REF)
207
200
202
203A
203
212
GTH990 OHVI SERIES ENGINE Model 005055-1

67
ITEM PART NO. QTY. DESCRIPTION
AIR CLEANER ASSEMBLY
200 0F7642 1 CLEANER, AIR WITH M8 MOUNTING BASE
201 0E3557 1 FILTER, AIR PRIMARY DONALDSON
202 0E3656 1 FILTER, AIR SAFETY DONALDSON
203 0E0136A 1 HOOD, INLET DONALDSON #H001377
203A 0E0136B 1 CLAMP,HOSE DONALDSON #P148058
204
205 0E1680 2 CLAMP, HOSE #32 1.563-2.5
206 0E2836 1 BRACKET, AIRCLEANER SUPPORT GTH990
207 0E3059 1 ADAPTOR, CARB TO AIRBOX GTH990
208 051754 2 SCREW, HHC M8-1.25 X 12
209 022129 4 WASHER, LOCK 5/16-M8
210 022145 6 WASHER, FLAT M8-5/16
211 042907 2 SCREW, HHC M8-1.25 X 16
212 0E4807 1 HOSE, AIRCLEANER CONNECTOR GTH990
ITEM PART NO. QTY. DESCRIPTION
MUFFLER MOUNTING
213 0E8558 1 MUFFLER, GTH990/760
214 0E6708A 1 SUPPORT, MUFFLER W/LIFT EYE-RH
215 0E6708B 1 SUPPORT, MUFFLER W/LIFT EYE-LH
216 067989 2 NUT, HEX FL WHIZ M8-1.25
217 039253 2 SCREW, HHC M8-1.25 X 20 G8.8
Model 005055-1 GTH990 OHVI SERIES ENGINE
CARBURETOR OVERHAUL KIT — 0F9124
PART NO. QTY. DESCRIPTION
0D4023 1 GASKET, MANIFOLD TO CARB GTH990
0D4026 1 GASKET, ARBX TO SPCR/CARB H990
0E5689 1 "O"RING, FLOAT BOWL DRAIN
0E5694 1 ASSY, NEEDLE VALVE
0E5695 1 SPRING, NEEDLE
0E5696 1 PIN, NEEDLE
0E5700 1 "O"RING, FLOAT BOWL
0E5701 1 GASKET, FLOAT BOWL
0E5696 1 PIVOT PIN, FLOAT

CARBURETOR BOWL GASKET KIT — 0F9125
PART NO. QTY. DESCRIPTION
0E5689 1 "O"RING, FLOAT BOWL DRAIN
0E5700 1 "O"RING, FLOAT BOWL
0E5701 1 GASKET, FLOAT BOWL
SOLENOID, FUEL SHUT OFF — 0E5551
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GTH990 OHVI SERIES ENGINE Model 005055-1
OIL RELIEF KIT — 0D40150SRV
PART NO. QTY. DESCRIPTION
0C3009 2 SPRING, OIL RELIEF
0C3010 2 BALL, 1/2D OIL RELIEF
0C3011 2 COVER, OIL RELIEF
GEAR COVER KIT — 0D40160SRV
PART NO. QTY. DESCRIPTION
0C2988 1 THRUST WASHER
0C2991 2 E-RING, GOVERNOR ARM
0C2992 1 BUSHING, GOVERNOR LOWER
0C3009 2 SPRING, OIL RELIEF
0C3010 2 BALL, 1/2D OIL RELIEF
0C3011 2 COVER, OIL RELIEF
0D1667 1 ARM, GOVERNOR
0E9842 1 SEAL CRANKSHAFT PTO SIDE
090388 4 SCREW, HHTT M6-1.0 X 12 ZINC
0C5998 1 CLAMP, OIL TUBE
GASKET KIT — 0D40100ESV
PART NO. QTY. DESCRIPTION
0C2977 1 GASKET, C’CASE
0C2978 2 GASKET, CYLINDER HEAD
0C2979 2 GASKET, VALVE COVER
0C2993 1 SEAL, GOVERNOR SHAFT
0C3005 1 GASKET, BREATHER COVER
0C3043 2 GASKET, INTAKE PORT
0C4138 2 GASKET, EXHAUST PORT
0C5943 1 SEAL, OIL PASSAGE
0D4026 1 GASKET, CARB TO SPACER
0D4023 1 GASKET, MANIFOLD TO CARB
0E9842 1 SEAL CRANKSHAFT PTO SIDE
0E9843 1 SEAL CRANKSHAFT FLYWHEEL SIDE
0C3027 1 O-RING 3/8 X 1/2
BREATHER ASSEMBLY KIT — 0D40120SRV
PART NO. QTY. DESCRIPTION
0C3005 1 GASKET, BREATHER COVER
0C5372 1 ASSY, BREATHER
0E3372B 1 SEPARATOR, OIL BREATHER
GOVERNOR KIT ASSEMBLY — 0D40130SRV
PART NO. QTY. DESCRIPTION
0A7811 1 SPOOL, GOVERNOR MACHINED
0C2985A 2 BEARING ROLLER GOV TOP
0C2985B 1 BEARING ROLLER GOV W/ROLLERS
0D4042 1 ASSY, GOV GEAR-LIGHT FLYWGT
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HEAD ASSEMBLY KIT - CYL #1 —
0D8675ASRV
PART NO. QTY. DESCRIPTION
0C2229 1 VALVE, INTAKE
0C2976 6 SCREW, HHFC M8-1.25 X 65
0C2978 1 GASKET, CYLINDER HEAD
0C2979 1 GASKET, VALVE COVER
0C3043 2 GASKET, INTAKE PORT
0C4138 2 GASKET, EXHAUST PORT
0C5371 2 WASHER, VALVE SPRING
0D2274 2 RETAINER, VALVE SPRING
0D3867 2 SPRING, VALVE
0D3998 2 NUT, HEX M8-1.0 G8 YEL CHR
0D5313 2 ROCKER ARM
0D6024 1 PLATE, PUSH ROD GUIDE
0D8067A 1 ASSY, CYL HEAD GUIDES & SEATS CYL 1
0D9853D 2 PUSHROD 147 LENGTH
072694 1 STUD, ROCKER ARM PIVOT
078672 1 SEAL, VALVE STEM D7
086515 2 KEEPER, VALVE SPRING (SET OF 2)
086516 1 VALVE, EXHAUST
HEAD ASSEMBLY KIT - CYL #2 —
0D8675BSRV
PART NO. QTY. DESCRIPTION
0C2229 1 VALVE, INTAKE
0C2976 6 SCREW, HHFC M8-1.25 X 65
0C2978 1 GASKET, CYLINDER HEAD
0C2979 1 GASKET, VALVE COVER
0C3043 2 GASKET, INTAKE PORT
0C4138 2 GASKET, EXHAUST PORT
0C5371 2 WASHER, VALVE SPRING
0D2274 2 RETAINER, VALVE SPRING
0D3867 2 SPRING, VALVE
0D3998 2 NUT, HEX M8-1.0 G8 YEL CHR
0D5313 2 ROCKER ARM
0D6024 1 PLATE, PUSH ROD GUIDE
0D8067B 1 ASSY, CYL HEAD GUIDES & SEATS CYL 2
0D9853D 2 PUSHROD 147 LENGTH
072694 1 STUD, ROCKER ARM PIVOT
086515 2 KEEPER, VALVE SPRING (SET OF 2)
086516 1 VALVE, EXHAUST
PISTON KIT — 0E29500SRV
PART NO. QTY. DESCRIPTION
0E1466 2 PIN, PISTON 20 DIA X 48
0E2950 2 PISTON, 8.5:1 90MM DIA LOW COMPR
021533A 2 RING, PISTON TOP 90MM
021533B 2 RING, PISTON 2ND 90MM
021533C 4 RING, OIL RAIL 90MM
021533D 2 RING, OIL SPACER 90MM
071983 4 RETAINER, PISTON PIN 20
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Manual No. 0F6913 Revision C (12/20/05) Printed In U.S.A.