GTH990
Engine Parts Manual
Model: 005055-1
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Model 005055-1
GTH990 OHVI SERIES ENGINE
ITEM PART NO. QTY. DESCRIPTION
ITEM PART NO. QTY. DESCRIPTION
1
2
0C57290SRV
0E9843
1
1
ASSEMBLY, CRANKCASE HOUSING WITH
SLEEVE
38
39
40
41
0C5305
0C3027
0E9842
0C5731
1
1
1
1
TUBE, DIPSTICK
O-RING, OIL CLR 3/8 X 1/2
SEAL, 42 I.D. CRANKSHAFT PTO SIDE
ASSEMBLY, HOUSING COVER WITH
SLEEVE
SEAL, 38 I.D. CRANKSHAFT FLYWHEEL
SIDE
3
4
090388
3
1
1
1
1
4
1
4
2
2
2
1
1
2
1
1
1
1
1
1
2
2
1
1
1
2
2
2
2
1
1
1
2
1
1
1
SCREW, HHTT M6-1.0 X 12 YC
ASSEMBLY, BREATHER
0C5372
0C3005
0E3372B
0D8067A
071983
42
43
44
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
0C3006
080318
10
8
1
1
2
8
4
4
2
4
4
4
2
4
2
12
2
2
4
1
4
2
2
1
1
1
1
1
1
1
1
2
4
1
5
SCREW, HHFC M10-1.5 X 55
SCREW HHFC M6-1.0 X 25
ASSEMBLY, OIL FILL CAP
ROCKER, COVER WITH OIL FILL
GASKET, VALVE COVER
KEEPER, VALVE SPRING
RETAINER, VALVE SPRING
SPRING, VALVE
5
GASKET, BREATHER COVER
SEPARATOR, OIL BREATHER
ASSEMBLY, HEAD #1 G&S
RETAINER, PISTON PIN 20
ROCKER, COVER W/BARB FITTING
STUD M8-1.25/10MM X 30 G5 ZINC
PISTON, HC
6
0930640SRV
0D5269
0C2979
7
8
9
0C2981C
045761A
0E2950
0215330SRV
0E1466
0D4041
0C2983
0C2985A
0C2985B
0D4042
0A7811
0C2977
0C5943
0E4357C
0E3223
0D2157
0E6098
0D4123A
0E8152
0C3011
0C3009
0C3010
093873
086515
0D2274
10
11
12
13
14
15
16A
16B
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
0D3867
078672
SET, PISTON RING 90MM
PIN PISTON D20
SEAL, VALVE STEM D7
WASHER, VALVE SPRING
STUD, ROCKER ARM PIVOT
NUT HEX M8-1.0 G8 YEL CHR
O-RING, 3/8" X 1/2"
0C5371
072694
ASSEMBLY, CAMSHAFT & GEAR
SHAFT, GOVERNOR
0D3998
0C3027
ROLLER BEARING, GOVERNOR PLATE
ROLLER BEARING, GOVERNOR
ASSEMBLY, GOVERNOR GEAR
SPOOL, GOVERNOR MACHINED
GASKET, CRANK CASE
0D5313
0D6024
ROCKER ARM
PLATE, PUSH ROD GUIDE
SCREW HHFC M8-1.25 X 65
VALVE, EXHAUST
0C2976
086516
SEAL, OIL PASSAGE
ASSEMBLY, CRANKSHAFT HORIZ L & G
CONNECTING ROD
0C2229
083897
VALVE, INTAKE
TAPPET, SOLID
0D8067B
0D9853D
0C2978
ASSEMBLY, HEAD #2 G&S
PUSHROD, 147
GASKET, HEAD
SCREW, SHC M6-1.0 X 50 G8.8
SCREEN, OIL PICKUP
ASSEMBLY, OIL PUMP
0D4788
PLUG,STD PIPE 3/8
KIT GASKET
KIT PISTON & RINGS
O-RING .49 X .07 THICK
COVER, OIL RELIEF
0D40100ESV
0E29500SRV
0D40120ESV
0D40130SRV
0D8675ASRV
0D8675BSRV
0D40150SRV
0D40160SRV
0C4138
SPRING, OIL RELIEF
BALL, 1/2D OIL RELIEF
KIT BREATHER ASSEMBLY
KIT GOVERNOR ASSEMBLY
KIT HEAD ASSEMBLY CYLINDER 1
KIT HEAD ASSEMBLY CYLINDER 2
KIT OIL RELIEF
WASHER, LOCK M6 RIBBED
SCREW, PLASTITE HI-LOW #10
CLAMP, OIL TUBE
0F5458
0C5998
0D1667
0C2991
0C2988
0C2992
0F2664C
ARM, GOVERNOR
KIT GEAR COVER
E-RING, GOVERNOR ARM
THRUST WASHER, GOVERNOR
BUSHING, GOVERNOR LOWER
ASSEMBLY, DIPSTICK WITH HANDLE
GASKET, EXHAUST PORT
NUT, HEX W/TOOTH WSHR M8-1.25
SEAL, GOVERNOR SHAFT
SCREW, HHFC M6-1.0 X 10
0F0462
0C2993
0D6147
3
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GTH990 OHVI SERIES ENGINE
Model 005055-1
4
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Model 005055-1
GTH990 OHVI SERIES ENGINE
ITEM PART NO. QTY. DESCRIPTION
ITEM PART NO. QTY. DESCRIPTION
146
147
148
149
150
151
152
154
155
156
157
158
159
160
161
162
163
164
165
166
167
061906
022145
022129
0F5467
0F0106
0E0124
0C3018
0E6043
0C3019
0C3025
0C7292
070185B
035461
0F6301
0C9806
0C3043
0C3026
0C9764
0E4997
0F1153B
0F1170C
2
1
3
1
1
1
1
2
1
1
1
1
2
4
2
2
1
4
1
1
1
SCREW, HHC M8-1.25 X 85 G8.8
WASHER, FLAT M8
WASHER, LOCK M8-5/16
90
91
0C9911
0D4023
0E9995
0D4626
0D6021
049821
070006
070008
030340R
048031C
086061G
0D9960
0E9271
022152
036933
022158
0F1672
0E8724
0E9137
0E9192
0E8920
0D9513
0E8966
0E9046
0D1366
0E9253
0F4363
0F2734
0F4360
0F2652
0F2651
0E9004
045756
1
1
1
1
4
4
4
4
2
4
1
1
1
1
1
1
2
1
1
1
1
1
1
MANIFOLD, INTAKE HORIZONTAL 2-BARREL
GASKET, MANIFOLD TO CARB GTH990
CARBURETOR, GTH990
92
93
NUT, HEX M8-1.25 YELLOW ZINC
FILTER, FUEL DONALDSON
END CAP L-BLUE
GASKET, AIRBOX TO SPCR/CARB GTH990
STUD, METRIC
94
95
SCREW, SHC M8-1.25 X 30
WASHER, LOCK M8
WASHER, FLAT M8
WRAPPER, UPPER CYLINDER 1
SCREW, THTT M5-0.8 X 8 ZP
WRAPPER, LOWER CYLINDER 1
SWITCH, OIL PRESSURE
96
97
98
99
HOSE, 0.25 ID
CLAMP, HOSE BAND ¼
NIPPLE, ¾"-16 UNF
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
SLEEVING, ½" ID X 3" LG
ROD, CHOKE
FILTER, OIL BLACK 75mm LONG
BARBED STR 1/4NPT X 3/8
CLAMP, HOSE OETIKER 16.5mm
HOSE, 3/8" I.D. X 6" LONG
GASKET, MANIFOLD / PORT
COOLER, OIL
BRACKET, THROTTLE GTH990
WASHER, LOCK #10
SCREW, PPHM #10-32 X 3/8
NUT, HEX #10-32 STEEL
BOLT, GOVERNOR LINK SHOULDER
ROD, GOVERNOR
PLASTITE, ¼-15 X ¾
CONNECTOR, GROUND WIRE
STATOR, OUTLINE W/LUGS-14.25"
PLATE, BACKING GT990 W/REGULTR
CUTOUT
ASSY, SPEED CONTROL ROD
BUSHING, REAR SPEED CONTROL
BRACKET, THROTTLE ROD SUPPORT
SPRING, GOVERNOR ADJUSTMENT
ASSEMBLY, GOVERNOR LEVER
BELLCRANK, CHOKE
168
169
170
171
172
173
174
175
048031G
022097
092079
0E7743
0C3052
0F1177
0E0116
0C3031A
1
4
8
1
1
1
1
1
CLAMP, HOSE
WASHER, LOCK M6-1/4
1
SCREW, HHTT M6-1.0 X 25 BP
ASSY, IGNITION COIL 270mm CYLINDER 1
ASSY, IGNITION COIL GV-990 CYLINDER 2
ASSEMBLY, GROUND WIRE
ASSEMBLY, FLYWHEEL W/LC MAG FRNT PTO
FAN, FLYWHEEL PTO SHAFT VERSION
NYLON
1
1
BUSHING, GOVERNOR ROD
ROD,BELLCRANK TO CHOKE LEVER
SPRING, CHOKE RETURN
BELLCRANK, THROTTLE-CHOKE
SCREW, HHTT M4-0.7 X 6 BP
STUD, THROTTLE CONTROL
BUSHING, THROTTLE CONTROL
PANEL, CONTROL FACE PLATE
SCREW, HHTT M6-1.0 X 10 YELLOW
CHROME
1
1
2
1
1
176
177
178
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194A
194B
194C
194D
196
197
198
0D9560
0C3033
0C3034
0A5992
048571
0F1169F
0C8566
0C9763
0D9684A
0D7115
0A2702
082774
0F3202
0E6424
048031G
0C5894
0E8388
022471
022264
0F2094
0F1150
0E3146
0C5136
0D7815A
1
1
1
4
4
1
4
4
1
4
1
1
1
1
1
1
4
1
1
1
1
4
4
1
CLAMP, FLYWHEEL FAN FRONT PTO
WASHER, M24
NUT, HEX M24
1
21
WASHER, SHAKEPROOF INT M8 SS
SCREW, HHC M8-1.25 X 10 G8.8
HOUSING, BLOWER HOR GASOLINE
SCREW, HHC M6-1.0 X 20
NUT, GROMMET ¼ PLUG
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
0F0710
0E9112B
049226
045770
0D9861
0D3751
037398
0F4362
0E8137
0E8357
0E9112A
0E4190
0F5579
0D1142A
0D6147
0D1143
022264
0D6142
0C4147
0D5399A
0E7585
0E4271
1
1
6
6
1
1
1
1
1
1
1
6
6
1
2
1
2
2
1
1
2
1
RIVET, POP 0.125 X 0.337 STEEL
BRACKET, BOWDEN CABLE LOWER
WASHER, LOCK #10
SCREW, HHC M5-0.8 X10 G8.8
SCREW, HHC W/PHILLIPS M5-0.8 X 30
SPRING, IDLE RETURN
SCREEN, ROTATING NO PTO
SCREW, #10 SHEET METAL
REGULATOR, VOLTAGE (20A)
KEY, WOODRUFF 4 X 19D
HS HARNESS; 4 PIN FEMALE
HOSE, BREATHER GTH990 L&G
HOSE, CLAMP GREEN
NUT, HEX LOCK #10-32 NY INS
WASHER, WAVE
LEVER, THROTTLE GTH990
LEVER, CHOKE GTH990
BRACKET, BOWDEN CABLE UPPER
CLAMP, 3/16" COATED CABLE
SCREW, HHC W/SHLDR M5-0.8 X 20
WRAPPER, LOWER CYLINDER 2
SCREW, HHFC M6-1.0 X 10mm
WRAPPER, UPPER CYLINDER 2
WASHER, LOCK M4
CLAMP, FUEL LINE 1/4
NUT, HEX FLANGE WHIZ M6-1.0
NUT, HEX #8-32
WASHER, LOCK #8-M4
SCREW, PPHM M3-0.5 X SEMS
HOUSING, CONN PACKARD 56 SERIES
SPACER, ROTATING SCREEN GUARD
KNOB, AIR CLEANER
SCREW, PPHM M4-0.7 X 40
PUMP, PULSE
ELBOW, RUBBER 90 DEGREE
SPARKPLUG
STARTER, DELCO REMY SD80
ASSY, ROTATING SCREEN GUARD
5
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GTH990 OHVI SERIES ENGINE
Model 005055-1
6
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Model 005055-1
GTH990 OHVI SERIES ENGINE
ITEM PART NO. QTY. DESCRIPTION
ITEM PART NO. QTY. DESCRIPTION
AIR CLEANER ASSEMBLY
MUFFLER MOUNTING
200
201
202
203
203A
204
205
206
207
208
209
210
211
212
0F7642
0E3557
0E3656
0E0136A
0E0136B
1
1
1
1
1
CLEANER, AIR WITH M8 MOUNTING BASE
FILTER, AIR PRIMARY DONALDSON
FILTER, AIR SAFETY DONALDSON
HOOD, INLET DONALDSON #H001377
CLAMP,HOSE DONALDSON #P148058
213
214
215
216
217
0E8558
0E6708A
0E6708B
067989
039253
1
1
1
2
2
MUFFLER, GTH990/760
SUPPORT, MUFFLER W/LIFT EYE-RH
SUPPORT, MUFFLER W/LIFT EYE-LH
NUT, HEX FL WHIZ M8-1.25
SCREW, HHC M8-1.25 X 20 G8.8
0E1680
0E2836
0E3059
051754
022129
022145
042907
0E4807
2
1
1
2
4
6
2
1
CLAMP, HOSE #32 1.563-2.5
BRACKET, AIRCLEANER SUPPORT GTH990
ADAPTOR, CARB TO AIRBOX GTH990
SCREW, HHC M8-1.25 X 12
WASHER, LOCK 5/16-M8
WASHER, FLAT M8-5/16
SCREW, HHC M8-1.25 X 16
HOSE, AIRCLEANER CONNECTOR GTH990
CarburETor ovErHaul KiT — 0f9124
CarburETor bowl GasKET KiT — 0f9125
PART NO.
0D4023
0D4026
0E5689
0E5694
0E5695
0E5696
0E5700
0E5701
0E5696
QTY.
DESCRIPTION
PART NO.
0E5689
0E5700
QTY.
DESCRIPTION
1
1
1
1
1
1
1
1
1
GASKET, MANIFOLD TO CARB GTH990
GASKET, ARBX TO SPCR/CARB H990
"O"RING, FLOAT BOWL DRAIN
ASSY, NEEDLE VALVE
SPRING, NEEDLE
1
1
1
"O"RING, FLOAT BOWL DRAIN
"O"RING, FLOAT BOWL
GASKET, FLOAT BOWL
0E5701
solEnoid, fuEl sHuT off — 0E5551
PIN, NEEDLE
"O"RING, FLOAT BOWL
GASKET, FLOAT BOWL
PIVOT PIN, FLOAT
7
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GTH990 OHVI SERIES ENGINE
Model 005055-1
PART NO.
0C3009
0C3010
oil rEliEf KiT — 0d40150srv
HEad assEMblY KiT - CYl #1 —
0d8675asrv
QTY.
DESCRIPTION
2
2
2
SPRING, OIL RELIEF
BALL, 1/2D OIL RELIEF
COVER, OIL RELIEF
PART NO.
0C2229
0C2976
0C2978
0C2979
0C3043
0C4138
0C5371
0D2274
0D3867
0D3998
0D5313
0D6024
0D8067A
0D9853D
072694
078672
086515
086516
QTY.
DESCRIPTION
VALVE, INTAKE
1
6
1
1
2
2
2
2
2
2
2
1
1
2
1
1
2
1
0C3011
SCREW, HHFC M8-1.25 X 65
GASKET, CYLINDER HEAD
GASKET, VALVE COVER
GASKET, INTAKE PORT
GASKET, EXHAUST PORT
WASHER, VALVE SPRING
RETAINER, VALVE SPRING
SPRING, VALVE
GEar CovEr KiT — 0d40160srv
PART NO.
0C2988
0C2991
0C2992
0C3009
0C3010
0C3011
0D1667
0E9842
090388
QTY.
DESCRIPTION
THRUST WASHER
1
2
1
2
2
2
1
1
4
1
E-RING, GOVERNOR ARM
BUSHING, GOVERNOR LOWER
SPRING, OIL RELIEF
NUT, HEX M8-1.0 G8 YEL CHR
ROCKER ARM
BALL, 1/2D OIL RELIEF
COVER, OIL RELIEF
ARM, GOVERNOR
PLATE, PUSH ROD GUIDE
ASSY, CYL HEAD GUIDES & SEATS CYL 1
PUSHROD 147 LENGTH
STUD, ROCKER ARM PIVOT
SEAL, VALVE STEM D7
KEEPER, VALVE SPRING (SET OF 2)
VALVE, EXHAUST
SEAL CRANKSHAFT PTO SIDE
SCREW, HHTT M6-1.0 X 12 ZINC
CLAMP, OIL TUBE
0C5998
GasKET KiT — 0d40100Esv
PART NO.
0C2977
0C2978
0C2979
0C2993
0C3005
0C3043
0C4138
0C5943
0D4026
0D4023
0E9842
0E9843
0C3027
QTY.
DESCRIPTION
GASKET, C’CASE
HEad assEMblY KiT - CYl #2 —
0d8675bsrv
1
2
2
1
1
2
2
1
1
1
1
1
1
GASKET, CYLINDER HEAD
GASKET, VALVE COVER
SEAL, GOVERNOR SHAFT
GASKET, BREATHER COVER
GASKET, INTAKE PORT
GASKET, EXHAUST PORT
SEAL, OIL PASSAGE
PART NO.
0C2229
0C2976
0C2978
0C2979
0C3043
0C4138
0C5371
0D2274
0D3867
0D3998
0D5313
0D6024
0D8067B
0D9853D
072694
QTY.
DESCRIPTION
VALVE, INTAKE
1
6
1
1
2
2
2
2
2
2
2
1
1
2
1
2
1
SCREW, HHFC M8-1.25 X 65
GASKET, CYLINDER HEAD
GASKET, VALVE COVER
GASKET, INTAKE PORT
GASKET, EXHAUST PORT
WASHER, VALVE SPRING
RETAINER, VALVE SPRING
SPRING, VALVE
GASKET, CARB TO SPACER
GASKET, MANIFOLD TO CARB
SEAL CRANKSHAFT PTO SIDE
SEAL CRANKSHAFT FLYWHEEL SIDE
O-RING 3/8 X 1/2
NUT, HEX M8-1.0 G8 YEL CHR
ROCKER ARM
PLATE, PUSH ROD GUIDE
ASSY, CYL HEAD GUIDES & SEATS CYL 2
PUSHROD 147 LENGTH
STUD, ROCKER ARM PIVOT
KEEPER, VALVE SPRING (SET OF 2)
VALVE, EXHAUST
brEaTHEr assEMblY KiT — 0d40120srv
PART NO.
0C3005
0C5372
QTY.
DESCRIPTION
GASKET, BREATHER COVER
1
1
1
086515
086516
ASSY, BREATHER
SEPARATOR, OIL BREATHER
0E3372B
PART NO.
0E1466
0E2950
021533A
021533B
021533C
021533D
071983
PisTon KiT — 0E29500srv
PART NO.
0A7811
0C2985A
0C2985B
0D4042
GovErnor KiT assEMblY — 0d40130srv
QTY.
DESCRIPTION
QTY.
DESCRIPTION
2
2
2
2
4
2
4
PIN, PISTON 20 DIA X 48
PISTON, 8.5:1 90MM DIA LOW COMPR
RING, PISTON TOP 90MM
RING, PISTON 2ND 90MM
RING, OIL RAIL 90MM
1
2
1
1
SPOOL, GOVERNOR MACHINED
BEARING ROLLER GOV TOP
BEARING ROLLER GOV W/ROLLERS
ASSY, GOV GEAR-LIGHT FLYWGT
RING, OIL SPACER 90MM
RETAINER, PISTON PIN 20
Manual No. 0F6913
Revision C (12/20/05)
Printed In U.S.A.
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