woodmizer G18 Guide

WARNING! Read and understand this
manual before using this machine.
!
G18/G19 Engine
Safety, Operation, Maintenance
& Parts Manual
065192 Engine Module, LT15G19 rev. G
Safety is our #1 concern!
March 2011
Form #1744
G18 engines were re-designated G19 on
1/30/2015 per ECN 20372 to match the actual
rating of the engine.
Used with LT15s revision E8.13
LT15W A1.14

Active Patents assigned to Wood-Mizer, LLC
Wood-Mizer, LLC has received patents that protect our inventions which are a result of a dedication to
research, innovation, development, and design. Learn more at: woodmizer.com/patents
©2021 Wood-Mizer LLC
Printed in the United States of America, all rights reserved. No part of this manual may be reproduced in any form by any
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written permission from
Wood-Mizer, LLC
8180 West 10th Street
Indianapolis, Indiana 46214
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Table of Contents Section-Page
Table of Contents WM doc 8/17/21 iii
SECTION 1 ABOUT THIS MANUAL 1-1
SECTION 2 OPERATION 2-1
2.1 Starting The Engine ............................................................................... 2-1
SECTION 3 MAINTENANCE 3-1
3.1 Safety ..................................................................................................... 3-1
3.2 Cooling System...................................................................................... 3-1
3.3 Air Filter & Pre-Cleaner ........................................................................ 3-1
3.4 Fuel Filter............................................................................................... 3-2
3.5 Battery.................................................................................................... 3-2
3.6 RPM Adjustments.................................................................................. 3-2
3.7 Miscellaneous Maintenance................................................................... 3-3
SECTION 4 REPLACEMENT PARTS 4-1
4.1 Fuel Tank ............................................................................................... 4-1
LT15 Rev. E8.07+
4.2 Fuel Tank ............................................................................................... 4-2
LT15 Rev. E8.04 - E8.06
4.3 Fuel Tank ............................................................................................... 4-3
LT15 Rev. E4.03 - E8.03
4.4 Engine Assembly ................................................................................... 5-4
4.5 Throttle Assembly.................................................................................. 5-6
LT15G18 Rev. E6.09 - E7.00
LT15G18/19 Rev. E7.01+

1
1-1 WM doc 8/17/21
SECTION 1 ABOUT THIS MANUAL
This manual is provided as a supplement to the equipment manufacturer’s manuals.
This manual provides information specific to the use of this equipment on the Wood-Mizer® sawmill. Refer to the sawmill oper-
ator’s manual and manufacturer's manual before attempting to operate this equipment.
IMPORTANT! Read the sawmill operator’s manual and engine manufacturer’s man-
ual for instructions and safety precautions before operating this equipment.
The information and instructions given in this manual do not amend or extend the limited warranties for the equipment given at
the time of purchase.

Operation
Starting The Engine 2
Operation WM doc 8/17/21 2-1
SECTION 2 OPERATION
2.1 Starting The Engine
DANGER! Ensure the blade is disengaged and all persons are out of the path of the
blade before starting. Failure to do so will result in death or serious injury.
DANGER! Operate your engine only in well ventilated areas. The exhaust gases of
your engine can cause nausea, delirium, and potentially death unless adequate venti-
lation is present.
DANGER! Never operate an engine with a fuel or oil leak. This is a fire hazard, which
may cause serious injury or death.
WARNING! Do not operate engine without proper and operational spark arrester/muf-
fler. Sparks emitted from the engine exhaust could ignite surrounding materials, caus-
ing serious injury or death.
CAUTION! EPA Compliant Gas Tanks Only: Always relieve all fuel pressure inside
the tank prior to filling or connecting fuel fittings. Failure to do so may result in fuel
spillage.
CAUTION! EPA Compliant Gas Tanks Only: Disconnect the fuel tank when not in use,
or engine flooding or fuel spillage may result.
1. Close the engine choke by pulling the choke cable knob out.
2. Turn the key switch to the START position and release. Release the key switch to the RUN position after the engine starts.
3. When the engine starts, slowly push the choke cable knob in.
ENGINE SHUTOFF
1. Disengage the clutch handle to stop the blade if necessary.
2. Let the engine run for 15 seconds with no load, then turn the key switch to the OFF position.

Maintenance
Safety
3
3-1 WM doc 8/17/21 Maintenance
SECTION 3 MAINTENANCE
Refer to the manufacturer’s manual for maintenance intervals and procedures unless otherwise instructed in this manual. Fol-
low the manufacturer’s recommendations for dusty conditions.
IMPORTANT! This manual only provides information about additional proce-
dures or procedures to be performed at different time intervals than found in
the manufacturer's manuals. Refer to the manufacturer's manual for complete
maintenance instructions.
WARNING! Clean sawdust from all guards, vents, control boxes, or any
area where sawdust may gather after every shift. Failure to do so may
result in fire, causing death or serious injury.
3.1 Safety
Use caution when performing maintenance or service to the engine.
DANGER! Always be aware of and take proper protective measures against
rotating shafts, pulleys, fans, etc. Always stay a safe distance from rotating
members and make sure that loose clothing or long hair does not engage
rotating members resulting in possible injury.
DANGER! Engine components can become very hot during operation. Avoid
contact with any part of a hot engine. The exhaust components of your engine
are especially hot during and following operation. Contact with hot engine
components can cause serious burns. Therefore, never touch or perform ser-
vice functions on a hot engine. Allow the engine to cool sufficiently before
beginning any service function.
WARNING! Remove the blade before performing any engine service. Failure
to do so may result in serious injury.
WARNING! Always wear proper and necessary safety equipment when per-
forming service functions. Proper safety equipment includes eye protection,
breathing protection, hand protection and foot protection.
3.2 Cooling System
Wash the engine or brush off sawdust and debris every 50 hours of operation. Clean the grass screen, cooling fins, and exter-
nal surfaces. Remove any dust, dirt or oil. See engine manual for further instructions.
3.3 Air Filter & Pre-Cleaner
WARNING! Always wear proper and necessary safety equipment when per-
forming service functions. Proper safety equipment includes eye protection,
breathing protection, hand protection and foot protection.
Service the pre-cleaner every four hours of operation. Service by gently shaking excess sawdust and debris from the foam
piece.
Clean the air filter (air cleaner element) and pre-cleaner (element wrapper) every eight hours of operation. See the engine man-
ual for further instructions.

Maintenance
Fuel Filter 3
Maintenance WM doc 8/17/21 3-2
Replace the air filter (cleaner) every 200 hours of operation.
Replace the pre-cleaner (element wrapper) every 2000 hours of operation.
3.4 Fuel Filter
Replace the fuel filter every 100 hours of operation or as required for engine performance.
3.5 Battery
Check the battery electrolyte level every 50 hours of operation. See manufacturer’s manual for instructions.
DANGER! Batteries expel explosive gases. Keep sparks, flames, burning cig-
arettes, or other ignition sources away at all times. Always wear safety gog-
gles and a face shield when working near batteries. Failure to do so will cause
serious injury.1
WARNING! Battery posts, terminals and related accessories contain lead and
lead compounds, chemicals known to the State of California to cause cancer
and reproductive harm. Wash hands after handling.
3.6 RPM Adjustments
WARNING! Remove the blade before performing any engine service. Failure
to do so may result in serious injury.
Check the RPM with a tachometer every 200 hours of operation.
Before checking the RPM, make sure belt and brake strap tensions are correct (See Sawmill Maintenance). Also check oil, fuel,
and coolant levels.
Check that the cable spring, cable guide, cable, and throttle brackets are aligned. NOTE: It is important that the above compo-
nents are aligned. Proper alignment allows any slack in the cable (when engine is idling) to slide down into the cable spring.
This maintains free operation of the cable and prevents the cable from kinking. Make sure the shoulder bolt does not rub
against the crankcase vent tube.
1. Start the engine to measure the low-end RPM.
2. Refer to the engine manual to adjust the low-end RPM.
3. Engage the clutch handle to throttle the engine and measure the high-end RPM. The high-end RPM is factory-set at 3750.
Readjust the throttle cable if necessary to increase or reduce the high-end engine speed.
The throttle cable should be tensioned just enough so that the engine revs as soon as the clutch/brake handle is engaged.
NOTE: A properly adjusted throttle will extend the cable spring 1/4” to 3/8” (6.4 - 9.5 mm) when running and have a slight
amount of slack in the cable when idling.
1. Battery Council International, copyright 1987
Engine High End RPM Low End RPM
G19 3750 1800
TABLE 3-1

Maintenance
Miscellaneous Maintenance
3
3-3 WM doc 8/17/21 Maintenance
3.7 Miscellaneous Maintenance
Inspect the spark plugs every 100 hours of operation. Remove any deposits and adjust gap if necessary. See engine manual
for further information.
Review the manufacturer's engine manual for maintenance intervals.

Replacement Parts
Fuel Tank
Replacement Parts doc081721 4-1
4
SECTION 4 REPLACEMENT PARTS
4.1 Fuel Tank
LT15 Rev. E8.07+
REF DESCRIPTION ( Indicates Parts Available In Assemblies Only) PART # QTY.
TRAY ASSEMBLY, LT15 FUEL TANK 103815 1
1Weldment, Fuel Tank Tray 103802 1
2Cover, Fuel Tank 103867 1
3Tank, 5 Gallon Low Pro EPA Fuel 103878 1
1 Fuel shut-off valve added to fuel tank to prevent possibility of fuel feeding back into engine during travel (LT15W Rev. A1.09/LT15
Rev. E8.09). Created service part 074943 Fuel Pick-Up with Shut-Off Fitting.
1
4Grommet, Shut Off 061250 1
5Gas Cap, LT15 061251 1
6Valve, Slosh 061252 1
7Grommet, Slosh Valve 061253 1
8Fitting, Fuel Pick-Up With Shut-Off 074943 1
9Bolt, 5/16-18 x 3/4” Hex Head w/Flat&Lock Washer F05006-101 4
10 Bolt, 3/8-16 x 3” Hex Head Grade 5 F05007-73 2
11 Nut, 3/8-16 Hex Nyloc F05010-10 2
12 Washer, 3/8” Flat SAE F05011-3 2
Hose, Fuel 3/16" EPA 15G CARB R02423-1 8 Ft.
Hose, Fuel 1/4" EPA 15G CARB R02423-2 8 Ft.
1
7
6
4
8
2
5
3
9
10
11
12
150244C

Replacement Parts
Fuel Tank
4
4-2 doc081721 Replacement Parts
4.2 Fuel Tank
LT15 Rev. E8.04 - E8.06
REF DESCRIPTION ( Indicates Parts Available In Assemblies Only) PART # QTY.
TANK ASSEMBLY, 6 GALLON GAS SERVICE 074643 1
1Tank, Gas 076478 1 
2Fitting, 1/4” NPT Male Quick Disconnect 015583 1
3 FITTING, FEMALE QUICK DISCONNECT BARB 015582 1
4 HOSE, 1/4” ID FUEL P642 9.3 Ft
5 CLAMP, 7/32” - 1/2” HOSE P649 2
1
2
3
4
5
150236-2

Replacement Parts
Fuel Tank
Replacement Parts doc081721 4-3
4
4.3 Fuel Tank
LT15 Rev. E4.03 - E8.03
REF DESCRIPTION ( Indicates Parts Available In Assemblies Only) PART # QTY.
TANK ASSEMBLY, 5-GALLON RED GASOLINE A12285 1
1 5 gallon gas can assemblies are available only for customers with sawmills and edgers manufactured prior to 2010. Customers with
sawmills and edgers manufactured in 2010 and later need to use new EPA approved 3 or 6 gallon gas can assemblies (see technical
bulletin TB150005 for more information).
1
1Tank, 5-Gallon Red Fuel P12167 1 
2Pickup, 9" Fuel P12172 1
3Cap, 3 or 5-Gallon Fuel Tank P09683 1
4Fitting, 1/4" NPT Plastic Female Disconnect P12175 1
5Fitting, 3/8” NPT Hex Plug P10367 1
6 HOSE, 1/4” ID FUEL P642 9.3 Ft
7 CLAMP, 7/32 - 1/2 HOSE P649 2
8 FITTING, 1/4" NPT PLASTIC MALE DISCONNECT P12176 2
2 Replacement requires qty. 1 hose clamp (P649).
1
1
2
3
4
8
7
6
3H0415C
5

Replacement Parts
Engine Assembly
4
4-4 G19doc081721 Replacement Parts
G19
4.4 Engine Assembly
REF DESCRIPTION ( Indicates Parts Available In Assemblies Only) PART # QTY.
Engine Assembly, LT15 G19 065191 1
1Engine, 19HP Kohler CH620-3088 016899 1
2Filter, Kohler Air 006907 1
3Pre Cleaner, Kohler 006931 1
Starter, Kohler Engine KH# 25 098 21S 061371 1
Plug Spark, Kohler RFI #25 132 14-S 061417 2
Plug, RC12YC Kohler Spark #12-132-02 P12757 2
Module Kit, Kohler Ignition #KH24 584 45S (Qty. 2) 061370 1
Pump, Kohler Fuel #24-393-16S 048391 1
Switch, Kohler Ignition #25-099-37S 061150 1
4Filter, Kohler Oil #12 050 01S 065264 1
1
2
3
4
5
6
7
8
9
10
11
13
27
12
14
15
16
17
18
19
150199
21
20
22
23
24
25
26

Replacement Parts
Engine Assembly
Replacement Parts G19doc081721 4-5
4
G19
5Filter, Kohler Fuel #24-050-13 P12758 1
6Muffler Assembly, Kohler 065193 1
7Deflector, Kohler Muffler #12-755-28 016496 1
8Arrestor, Kohler Spark #12-189-02 016495 1
9Bushing, 1 1/8” SH 038432 1
10 Pulley, 3V5.6 x 2” SH 047742 1
11 Washer, 7/16” Split Lock F05011-48 2
12 Bolt, 7/16-14 x 1” Hex Head Grade 5 F05007-145 2
13 Plate, Engine Guard 016493 1
14 Plate, Throttle Cable Mount 047750 1
15 Cable, LT15 G25 Throttle 047749 1
16 Spring, Throttle 016033 1
17 Spring, Throttle Extension 015952 1
18 Hose, 3/8” NPT Oil Drain P10082 1
19 Cap, Oil Drain Hose P04332 1
20 Key, 1/4” x 1 11/16” S04124 1
Harness, Battery To Engine (not shown) 024718 1
21 WASHER, 3/8” SAE FLAT F05011-3 4
22 Bolt, 3/8-16 x 1 3/4” Hex Head Grade 5 F05007-119 4
23 Nut, 3/8-16 Hex Nylon Lock F05010-10 4
24 Support Weldment, Drive Belt 048237 1
25 Bolt, 3/8-16 x 3/4” Hex Head Grade 5 F05007-118 1
26 Nut, 3/8-16 Self-Locking Hex F05010-19 1
27 Belt, 2/3VFL900 Drive 047751 1
CONVERSION KIT, LT15G15 TO G18 (REQ’D TO CONVERT FROM G15 TO G18) 065379 1
Wheel Assembly, LT15 3V Drive 036657 1
Engine Assembly, LT15 Gas 18hp 065191 1
Tray Assembly, LT15 Water Bottle 047744 1
Belt, 2/3VFL900 Drive 047751 1
Support Weldment, LT15G25 Belt 048237 1
Bolt, 3/8-16 x 3/4” Hex Head Grade 5 F05007-118 1
Nut, 3/8-16 Keps F05010-19 1
Bolt, 1/4-20 x 1/2” Self Tap Hex Head F05015-1 2
Clamp, 1/2” EMT Coated P07584 2
Nut, 3/8-16 Hex Nyloc F05010-10 4
Reduction Kit, LT15 Up/Dn 038871 1
CARB KIT, G25 DE-ICING 24 755 68S 061325 1

Replacement Parts
Throttle Assembly
4
4-6 G19doc081721 Replacement Parts
G19
4.5 Throttle Assembly
LT15G18 Rev. E6.09 - E7.00
REF DESCRIPTION ( Indicates Parts Available In Assemblies Only) PART # QTY.
1 PLATE, THROTTLE CABLE BRACKET LT15G 034616 1
2 SCREW, 1/4-20 X 3/4 FT HEX HEAD F05005-1 1
3 NUT, 1/4-20 NYLON LOCK F05010-69 1
4 SPRING, EXTENSION 3/8 X 3 014818 1
5 PIVOT WELDMENT, THROTTLE LT15G 034805 1
6 BOLT, 1/4-20 X 2 HEX HEAD GR5 F05005-125 1
7 NUT, 1/4-20 SWAGED F05010-21 2
8 LINK, THROTTLE 2 13/16 015446 1
9 CABLE ASSEMBLY, LT15G15 THROTTLE 034838 1
10 KNOB, 5/8-11 BALL P04211 1
11 HANDLE, LT15 CLUTCH 016487 1
12 SCREW, 3/8-16 X 1/2 SOCKET HEAD CUP PT SET F05007-12 2
13 ACTUATOR WELDMENT, THROTTLE LT15D&G 034815 1
150098F
1
2
3
4
5
6
7
7
8
9
10
11
13
12
12
14
15
16
17
17
18 19
20
22
24
23
25
26
26
27
28
29
30 31
32
33 34
39
38
35
35
37
36
36

Replacement Parts
Throttle Assembly
Replacement Parts G19doc081721 4-7
4
G19
14 LINKAGE, THROTTLE LT15D&G 034818 1
15 BOLT, 1/4-20 X 1/2” HEX HEAD F05005-15 1
16 NUT, 1/4-20 SWAGED F05010-21 1
17 BUSHING, 5/8” ID X 7/8” OD X 1 1/8” LONG FLANGED BRONZE 016486 2
18 BLOCK WELDMENT, LINKAGE CLUTCH/BRAKE 034612 1
19 PIN, 3/16 X 1 1/4 ROLL F05012-16 1
20 LINKAGE ASSEMBLY, W/BEARING 034605 1
21 Bushing, 5/8” ID x 7/8” OD x 1 1/8” Long Flanged Bronze 016486 1
22 NUT, 1/2-13 FREE HEX, ZINC F05010-35 1
23 WASHER, 1/2 SPLIT LOCK F05011-9 1
24 NUT, 1/2-13 JAM F05010-31 1
25 PIVOT WELDMENT, CLUTCH/BRAKE 034608 1
26 BUSHING, 1 X 1 1/4 X 3/4 FLG BRONZE P737 2
BRAKE/CLUTCH ASSEMBLY, LT15 034603 1
27 Arm Weldment, Clutch/Brake LT15 034613 1
28 Bolt, 3/8-16 x 2 Hex Head Gr5 F05007-124 1
29 Nut, 3/8-16 Hex Nylon Lock F05010-10 1
30 Block, LT15 Brake 016488 2
31 Screw, 10-24 x 1” Socket Head F05004-2 4
32 Nut, #10-24 Keps F05010-14 4
33 Idler, 4" O.D. x 3/8 Bore 034602 1
34 Bolt, 3/8-16 x 2-3/4” Hex Head Gr5 Full Thread F05007-230 1
35 Washer, 3/8 Flat F05011-3 2
36 Nut, 3/8-16 Swaged Lock F05010-25 2
37 Spring, Idler Arm LT15/D/E/G 034810 1

Replacement Parts
Throttle Assembly
4
4-8 G19doc081721 Replacement Parts
G19
LT15G18/19 Rev. E7.01+
REF DESCRIPTION ( Indicates Parts Available In Assemblies Only) PART # QTY.
1 KNOB, 5/8-11 BALL P04211 1
2 HANDLE, LT15 CLUTCH 016487 1
3 SCREW, 3/8-16 X 3/8 SOCKET HEAD CUP PT SET F05007-68 2
4 ACTUATOR WELDMENT, THROTTLE LT15D&G 034815 1
5 LINKAGE, THROTTLE LT15D&G 034818 1
6 BOLT, 1/4-20 X 1/2” HEX HEAD F05005-15 1
7 NUT, 1/4-20 SWAGED F05010-21 1
8 BUSHING, 5/8” ID X 7/8” OD X 1 1/8” LONG FLANGED BRONZE 016486 2
9 BLOCK WELDMENT, LINKAGE CLUTCH/BRAKE 065572 1
10 PIN, 3/16 X 1 1/4 ROLL F05012-16 1
11 LINKAGE ASSEMBLY, W/BEARING 034605 1
12 Bushing, 5/8” ID x 7/8” OD x 1 1/8” Long Flanged Bronze 016486 1
13 NUT, 1/2-13 FREE HEX, ZINC F05010-35 1
14 WASHER, 1/2 SPLIT LOCK F05011-9 1
15 NUT, 1/2-13 JAM F05010-31 1
16 PIVOT WELDMENT, CLUTCH/BRAKE 034608 1
150201C
1
2
4
3
5
6
7
8
8
910
11
13
15
14
16
17
17
18
19
20
21 22
23
24 25
32
33
26
26
27
28
29
30
31

Replacement Parts
Throttle Assembly
Replacement Parts G19doc081721 4-9
4
G19
17 BUSHING, 1 X 1 1/4 X 3/4 FLG BRONZE P737 2
BRAKE/CLUTCH ASSEMBLY, LT15 065874 1
18 Arm Weldment, Clutch/Brake LT15 065873 1
19 Bolt, 3/8-16 x 2 Hex Head Gr5 F05007-124 1
20 Nut, 3/8-16 Hex Nylon Lock F05010-10 1
21 Block, LT15 Brake 016488 2
22 Screw, 10-24 x 1” Socket Head F05004-2 4
23 Nut, #10-24 Keps F05010-14 8
24 Idler, 4" O.D. x 3/8 Bore 034602 1
25 Bolt, 3/8-16 x 2-3/4” Hex Head Gr5 Full Thread F05007-230 1
26 Washer, 3/8 Flat F05011-3 2
27 Nut, 3/8-16 Swaged Lock F05010-25 2
28 Spring, Idler Arm LT15/D/E/G 034810 1
29 Screw, 10-24 x 5/8” FSHC F05004-282 4
30 Plate, Brake Adjustment 065872 2
31 Washer, #10 SAE Flat F05011-18 4
32 NUT, 3/8-16 JAM F05010-29 2
33 SCREW, 3/8-16X1 1/4 SHOP SET F05007-18 2