woodmizer G18 LT30 Guide

G18 Engine
Safety, Operation, Maintenance
& Parts Manual
LT30 rev. J2.00 - J7.04
LT40 rev. J3.00 - K3.03
Safety is our #1 concern! Read and understand
all safety information and instructions before oper-
ating, setting up or maintaining this machine.
January 2004
Form #1048

©2017
Printed in the United States of America. All rights reserved. No part of this manual may be
reproduced in any form by any photographic, electronic, mechanical or other means or
used in any information storage and retrieval system without written permission from
Wood-Mizer
8180 West 10th Street
Indianapolis, Indiana 46214

Table of Contents Section-Page
Table of Contents G18doc121817 iii
ABOUT THIS MANUAL IV
SECTION 1 OPERATION 1-1
1.1 Starting The Engine................................................................................1-1
SECTION 2 MAINTENANCE 2-1
2.1 Safety......................................................................................................2-1
2.2 Cooling System ......................................................................................2-2
2.3 Air Filter & Pre-Cleaner.........................................................................2-3
2.4 Fuel Filter ...............................................................................................2-4
2.5 Battery ....................................................................................................2-5
2.6 Alternator Belt ........................................................................................2-6
2.7 RPM Adjustments ..................................................................................2-7
2.8 Miscellaneous Maintenance ...................................................................2-8
SECTION 3 REPLACEMENT PARTS 3-1
3.1 Fuel Tank................................................................................................3-1
3.2 Engine Mount Assembly ........................................................................3-2
3.3 Engine Assembly....................................................................................3-3
3.4 Alternator Assembly...............................................................................3-5
3.5 Engine Pulley Guards .............................................................................3-7
INDEX I

iv G1801doc121817 About This Manual
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 operator’s manual and manufacturer's manual before
attempting to operate this equipment.
IMPORTANT! Read the sawmill operator’s manual and
engine manufacturer’s manual 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.
ENGINE COMPONENTS
Air Filter Muffler
Serial Number/
Engine Type
3H0509-4
Alternator
Starter

Operation
Starting The Engine
Operation G1801doc121817 1-1
1
SECTION 1 OPERATION
1.1 Starting The Engine
Engine Control Lights
See Figure 1-1. The following indicator lights are located on the sawmill control panel.
Alternator Charge Indicator: Lights up if the alternator is not charging the battery.
Key Switch Indicator: Lights up when the key is in either the on or accessory (#1 or #3)
position.
Engine Start
DANGER! Always be sure the blade is disengaged and all
persons are out of the path of the blade before starting the
engine. Failure to do so will result in serious injury.
DANGER! Operate your engine/machine only in well venti-
lated areas. The exhaust gases of your engine can cause
nausea, delirium and potentially death unless adequate
ventilation is present.
FIG. 1-1

Operation
Starting The Engine
1
1-2 G1801doc121817 Operation
DANGER! Never operate an engine with a fuel or oil leak.
The leaking fuel or oil could potentially come in contact with
hot surfaces and ignite into flames.
WARNING! Be sure the power feed switch is in the neutral
position before turning the key switch to the on (#1) or
accessory (#3) position. This prevents accidental carriage
movement. which may cause serious injury or death.
WARNING! Do not operate engine without proper and
operational spark arrester/muffler. Sparks emitted from the
engine exhaust could ignite surrounding materials, causing
serious injury or death.
Turn the key switch to the start (#2) position and release.
If the engine needs choking to start, pull the choke cable out until the engine starts. Push
the choke wire in after the engine starts.
For more information, see the engine manufacturer’s operation manual.
If the fuel tank was recently filled or replaced, squeeze the primer bulb once or twice
before trying to start the engine. NOTE: If pumping problems are experienced, make sure
the out-flow end of the hose line is connected to the fuel filter. If pumping problems are
still experienced, hold the primer bulb in a vertical position while squeezing. This allows
the fuel check valve to operate properly.
NOTE: When the clutch handle is engaged, an accelerator pump is activated which sup-
plies fuel to the engine carburetor. To avoid flooding the carburetor and possibly fouling
the spark plugs, do not engage the clutch lever repeatedly without the engine running.
Engine Shutoff
Turn the key switch to the off (#0) position.

Maintenance
Safety
Maintenance G1801doc121817 2-1
2
SECTION 2 MAINTENANCE
Refer to the manufacturer’s manual for maintenance intervals and procedures unless oth-
erwise instructed in this manual. Follow the manufacturer’s recommendations for dusty
conditions.
IMPORTANT! This manual only provides information about
additional procedures or procedures to be performed at dif-
ferent time intervals than found in the manufacturer's manu-
als. Refer to the manufacturer's manual for complete
maintenance instructions.
2.1 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 service 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 performing service functions. Proper
safety equipment includes eye protection, breathing protec-
tion, hand protection and foot protection.
This symbol identifies the interval (hours of operation) at which each maintenance pro-
cedure should be performed. "AR" signifies maintenance procedures which should be
performed as required.
0

Maintenance
Cooling System
2
2-2 G1801doc121817 Maintenance
2.2 Cooling System
Wash the engine or brush off sawdust and debris every 50 hours of operation. Clean the
grass screen, cooling fins, and external surfaces. Remove any dust, dirt or oil. See
engine manual for further instructions.
50

Maintenance
Air Filter & Pre-Cleaner
Maintenance G1801doc121817 2-3
2
2.3 Air Filter & Pre-Cleaner
WARNING! Always wear proper and necessary safety
equipment when performing service functions. Proper
safety equipment includes eye protection, breathing protec-
tion, 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 manual for further instructions.
Replace the air filter (cleaner) every 200 hours of operation.
Replace the pre-cleaner (element wrapper) every 2000 hours of operation.
4
8
200
2000

Maintenance
Fuel Filter
2
2-4 G1801doc121817 Maintenance
2.4 Fuel Filter
Replace the fuel filter every 100 hours of operation or as required for engine perfor-
mance.
100

Maintenance
Battery
Maintenance G1801doc121817 2-5
2
2.5 Battery
Check the battery electrolyte level every 50 hours of operation. See manufacturer’s man-
ual for instructions.
DANGER! Batteries expel explosive gases. Keep sparks,
flames, burning cigarettes, or other ignition sources away at
all times. Always wear safety goggles and a face shield
when working near batteries. Failure to do so will cause
serious injury.1
WARNING! Battery posts, terminals and related accesso-
ries contain lead and lead compounds, chemicals known to
the State of California to cause cancer and reproductive
harm. Wash hands after handling.
1. Battery Council International, copyright 1987
50

Maintenance
Alternator Belt
2
2-6 G1801doc121817 Maintenance
2.6 Alternator Belt
Adjust the alternator belt as needed. Check the alternator belt for tension and wear when
battery is not charging properly or when the alternator belt is squealing. To tighten the
belt, loosen the adjustment bolt and lock washer. Pivot the alternator away from the motor
until the belt has 3/16" (5 mm) deflection with a 5 lb. deflection force. Retighten the adjust-
ment bolt.
See Figure 2-1.
FIG. 2-1
AR
3H0227
Loosen bolt to
pivot alternator
clockwise and
tighten belt

Maintenance
RPM Adjustments
Maintenance G1801doc121817 2-7
2
2.7 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 after the first 20 hours of operation and every 200
hours thereafter.
See Table 2-1.
Before checking the RPM, make sure belt and brake strap tensions are correct (See Saw-
mill Maintenance). Also check oil, fuel, and coolant levels.
Make sure the throttle cable does not affect the engine RPM when the clutch handle is
disengaged. Make sure the cable is not bent or kinked. Check that the cable spring, cable
guide, cable, and throttle brackets are aligned. NOTE: It is important that the above com-
ponents 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.
Engine High End RPM Low End RPM
G18 3750 1800
TABLE 2-1
200

Maintenance
Miscellaneous Maintenance
2
2-8 G1801doc121817 Maintenance
2.8 Miscellaneous Maintenance
Clean and inspect the spark arresters every 50 hours of operation. Replace if damaged.
Inspect the spark plugs every 100 hours of operation. Remove any deposits and adjust
gap if necessary. See engine manual for further information.
CAUTION! Do not remove the plug wire to check for electri-
cal spark. Damage to the ignition circuit will result.
50
100

Replacement Parts
Fuel Tank
Replacement Parts G1801doc121817 3-1
3
SECTION 3 REPLACEMENT PARTS
3.1 Fuel Tank
REF DESCRIPTION (Indicates Parts Available In Assemblies Only) PART # QTY.
TANK ASSEMBLY, 5-GALLON RED GASOLINE A12285 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
1 Plug fitting P10367 added 11/03. Hole added to fuel tank to accommodate return line for fuel injected engines.
1
6 HOSE, 1/4” ID FUEL P642 6.5 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 Mount Assembly
3
3-2 G1801doc121817 Replacement Parts
3.2 Engine Mount Assembly
REF DESCRIPTION (Indicates Parts Available In Assemblies Only) PART # QTY.
MOUNT KIT, KOHLER ENGINE 016319 1
1Mount Weldment, Kohler Engine 014514 1 
BUSHING ASSEMBLY, MOTOR MOUNT 016380 3
2Bushing, 2” OD x 2” 016378 1 
3Bearing, 1” x 1 1/4” x 2” 016379 1 
4 CLAMP WELDMENT , MOTOR MOUNT PIVOT BUSHING 014540 3
5 BOLT, 3/8-16 X 1” HEX HEAD F05007-7 3
6 NUT, 3/8-16 HEX NYLON LOCK F05010-10 6
7 BOLT, 1/2-13 X 1 1/4” HEX HEAD GRADE 5 F05008-37 1
8 PIN WELDMENT, ENGINE MOUNT PIVOT 014154 1
9 NUT, 1/2-13 NYLON LOCK F05010-8 1
1
2
3
3
4
4
5
6
6
7
8
9
3H0509-3

Replacement Parts
Engine Assembly
Replacement Parts G1801doc121817 3-3
3
3.3 Engine Assembly
REF DESCRIPTION (Indicates Parts Available In Assemblies Only) PART # QTY.
COVER, ENGINE P12393 1
ENGINE ASSEMBLY, 18HP KOHLER 017622 1
1Engine, 18HP Kohler #PA62590 016899 1 
2Filter, Kohler Air #47-083-03 006907 1
3Pre Cleaner, Kohler #24-083-02 006931 1
Plug, RC12YC Kohler Spark #12-132-02 P12757 2
4Filter, Kohler Oil #52-050-02 014717 1
5Filter, Kohler Fuel #24-050-13 P12758 1 1
Pump, Kohler Fuel #24-393-16S 048391 1
6Muffler, Kohler # 1
7Arrestor, Kohler 90° Spark #24-18901-S 036684 2 1
8Cable, 18” Throttle P12313 1
Spring, Throttle 016033 1
9Bracket, Throttle Cable Mount S12312 1
10 Spring, .5” x .08” x 1 3/8” Extension 015952 1
11 Bracket, G25 Throttle 015964 1
12 Bolt, #10-24 x 5/8” Hex Head F05004-18 1
13 Nut, #10-24 Self-Locking F05010-14 1
1
2
3
4
5
6
7
8
9
10 11 12
13
14 15
16
17
18 19
20 21
22
20
23
24
25
300129

Replacement Parts
Engine Assembly
3
3-4 G1801doc121817 Replacement Parts
14 Hose, 7" Oil Drain P10082 1
15 Cap, Oil Drain 3/8" Pipe P04332 1
Oil, 10W30 Type CD L04869-1 .5 Gal 
16 Bushing, 1 1/8” Split Taper P04306 1
17 Pulley, 4” OD 3-Groove S10435 1
18 Key, 1/4" x 1/4" x 1 11/16" S04124 1
19 BRACKET WELDMENT, DRIVE BELT SUPPORT PAINTED 015963 1
20 WASHER, 3/8” SAE FLAT F05011-3 6
21 WASHER, 3/8” SPLIT LOCK F05011-4 2
22 BOLT, 3/8-16 X 1” HEX HEAD F05007-7 1
23 BOLT, 3/8-16 X 1 3/4” HEX HEAD F05007-119 4
24 NUT, 3/8-16 HEX NYLON LOCK F05010-10 4
25 BELT, 2BX71 DRIVE 036163 3 1
CARB KIT, G18 DE-ICING 24 755 64S 061326 1
1 Kohler #24-050-13 9-12 micron filter replaces #240-050-10 8-10 micron filter originally supplied.
2 Replaces 016142 straight spark arrestor supplied with engine prior to 11/04.
3 036163 Kevlar 2BXF71 belt replaces P12949 2BX71 belt supplied prior to 9/03. Kevlar belt reduces stretch and provides greater range
of adjustment.

Replacement Parts
Alternator Assembly
Replacement Parts G1801doc121817 3-5
3
3.4 Alternator Assembly
REF DESCRIPTION (Indicates Parts Available In Assemblies Only) PART # QTY.
1 ALTERNATOR, 12V 105A 050287 1
2 BRACE, ALTERNATOR W12761 1
3 WASHER, 3/8” SAE FLAT F05011-3 1
4 BOLT, 3/8-16 X 5 1/2" HEX HEAD FULL THREAD F05007-34 1
5 NUT, 3/8-16 HEX NYLON LOCK F05010-10 1
6 WASHER, 5/16” SAE FLAT F05011-17 1
7 WASHER, 5/16" SPLIT LOCK F05011-13 1
8 BOLT, M8 X 1.25" X 1" HEX HEAD FULL THREAD F05004-40 1
9 WASHER, 5/16" SAE FLAT F05011-17 1
10 WASHER, 5/16" SPLIT LOCK F05011-13 1
11 BOLT, M8 X 1.25" X 1" HEX HEAD FULL THREAD F05004-40 1
12 PULLEY, ALTERNATOR P03806 1
13 BELT, A33 ALTERNATOR P11542 1
WIRE ASSEMBLY, G25 ALTERNATOR/STARTER 024308 1
WIRE ASSEMBLY, 61/105 AMP ALTERNATOR PLUG 015969 1
14 BRACKET, ALTERNATOR MOUNT 014509 1
15 WASHER, 3/8” SAE FLAT F05011-3 2
16 WASHER, 3/8” SPLIT LOCK F05011-4 2
1
2
3
4
5
6
7
8
910
11
12
13
14
15 16 17
25
19
18
20
21
22
23
3H0509-2C
24

Replacement Parts
Alternator Assembly
3
3-6 G1801doc121817 Replacement Parts
17 BOLT, 3/8-16 X 1” HEX HEAD F05007-7 2
18 GUARD, ALTERNATOR BELT 014499 1
19 STANDOFF, 1/4-20 X 1 7/8” 015957 2
20 WASHER, 1/4” SAE FLAT F05011-11 2
21 WASHER, 1/4” SPLIT LOCK F05011-14 2
22 BOLT, 1/4-20 X 1/2” HEX HEAD F05005-15 2
23 NUT, 1/4-20 SELF-LOCKING HEX F05010-9 1
24 WIRE ASSEMBLY, GROUND JUMPER 017770 1 1
1 Jumper wire added to improve ground contact (LT30 Rev. J3.00, LT40 Rev. J4.00).