woodmizer LT40HD Guide

G38 Engine
Safety, Operation, Maintenance
& Parts Manual
LT40HD rev. K5.00 - K7.01
LT40HD Super rev. J9.01 - K4.00
LT50HD rev. A1.01 - A6.00
Safety is our #1 concern! Read and understand
all safety information and instructions before oper-
ating, setting up or maintaining this machine.
May 2017
Form #2242

©2019
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
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Table of Contents Section-Page
Table of Contents WMdoc091819 iii
TOC
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 ......................................................................................3-2
3.3 Air Cleaner .............................................................................................3-2
3.4 Fuel Filter ...............................................................................................3-2
3.5 Battery ....................................................................................................3-2
3.6 Alternator Belt........................................................................................3-3
3.7 RPM Adjustments ..................................................................................3-4
3.8 Miscellaneous Maintenance ...................................................................3-4
SECTION 4 REPLACEMENT PARTS 4-1
4.1 Fuel Tank (G28/G29/G38) .....................................................................4-1
LT40 Rev. K4.08+
LT40 Super Rev. J7.17+
LT40HD Rev. K6.09+
LT40HD Super Rev. K3.17+
LT50 Rev. A5.17+
4.2 Fuel Tank (G28/G29/G38) .....................................................................4-3
LT40 Rev. K4.06 - K4.07
LT40 Super Rev. J7.16
LT40HD Rev. K6.07 - K6.08
LT40HD Super Rev. K3.15 - K3.16
LT50 Rev. A5.15 - A5.16
4.3 Fuel Tank (G26/G29/G38) (2010+) .......................................................4-4
LT40 Prior to Rev. K4.06
LT40 Super Prior to Rev. J7.16
LT40HD Prior to Rev. K6.07
LT40HD Super Prior to Rev. K3.15
LT50 Prior to Rev. A5.15
4.4 Fuel Tank (G26/G29/G38) (Pre-2010)..................................................4-5
LT40 Prior to Rev. K4.06
LT40 Super Prior to Rev. J7.16
LT40HD Prior to Rev. K6.07
LT40HD Super Prior to Rev. K3.15
LT50 Prior to Rev. A5.15
4.5 Engine Mount Assembly (G28/G29/G38)..............................................4-6
4.6 Engine Assembly....................................................................................4-7
4.7 Alternator Assembly...............................................................................4-9
4.8 Engine Pulley Guards (G38) ................................................................4-11

Table of Contents Section-Page
iv WMdoc091819 Table of Contents
INDEX I

About This Manual
About This Manual WM doc 9/18/19 1-1
1
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 operator’s manual and manufacturer's manual before
attempting to operate this equipment.
IMPORTANT! Read the sawmill operator’s manual and engine manu-
facturer’s manual for instructions and safety precautions before oper-
ating 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.
G38 EFI Engine
Air Cleaner
Muffler
Oil Filter
Alternator
Starter
3H1178
Fuel Pump

Operation
Starting The Engine
2
2-1 WM doc 9/18/19 Operation
SECTION 2 OPERATION
2.1 Starting The Engine
Engine Control Lights
See Figure 2-1. The following indicator lights are located on the sawmill control panel.
Alternator Charge Indicator: Lights up if the alternator is not charging the battery.
Engine Temperature Indicator: Not used.
Key Switch Indicator: Lights up when the key is in either the on or accessory (#1 or #3)
position.
Oil Indicator: Lights up if the oil pressure is too low. The engine will automatically switch to
low idle if a low oil condition occurs.
Glow Plug Indicator: Not used.
Engine Start
DANGER! Always be sure the blade is disengaged and all persons are
out of the path of the blade before starting the . Failure to do so will
result in serious injury.
FIG. 2-1

Operation
Starting The Engine
Operation WM doc 9/18/19 2-2
2
DANGER! Operate your engine/machine only in well ventilated areas.
The exhaust gases of your engine can cause nausea, delirium and
potentially death unless adequate ventilation is present.
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.
WARNING! EPA Compliant Gas Tanks Only: Always relieve all fuel
pressure inside the tank prior to filling or connecting fuel fittings. Fail-
ure to do so may result in fuel spillage.
WARNING! EPA Compliant Gas Tanks Only: Disconnect the fuel tank
when not in use or during transportation. Failure to do so may result in
engine flooding or fuel spillage.
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
3
3-1 WM doc 9/18/19 Maintenance
SECTION 3 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 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. Con-
tact 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 protection, hand protection and foot protec-
tion.
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
Maintenance WM doc 9/18/19 3-2
3
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 external surfaces. Remove any dust, dirt or oil. See
engine manual for further instructions.
3.3 Air Cleaner
WARNING! Always wear proper and necessary safety equipment
when performing service functions. Proper safety equipment includes
eye protection, breathing protection, hand protection and foot protec-
tion.
Replace the outer air cleaner cartridge and check the inner cartridge every 250 hours of
operation or more often if operating the sawmill in dirty conditions or if engine perfor-
mance indicates a new cartridge is necessary.
CAUTION! Do not clean elements with water or compressed air. Do
not handle the inner element unless it is to be changed. Handle new
elements carefully. Contact with the element could cause damage and
prevent the filter from operating properly.
Replace the inner air cleaner cartridge every 1200 hours of operation or more often if
operating the sawmill in dirty conditions.
3.4 Fuel Filter
Replace the fuel filter every 100 hours of operation or as required for engine perfor-
mance.
3.5 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.
50
250
1200
100
50

Maintenance
Alternator Belt
3
3-3 WM doc 9/18/19 Maintenance
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 Alternator Belt
The belt tension should be checked after the first 100 hours of operation, when the bat-
tery is not charging properly or when the alternator belt is squealing.
If the battery continues to not charge properly or the belt continues to squeal after the ini-
tial belt adjustment, replace the belt.
1. Release the blade tension and remove the blade from the sawmill if necessary. Turn the
key switch to OFF (0) and remove the key.
2. Remove the drive belt cover and alternator cover.
See Figure 3-1.
3. Use a belt tension gauge to measure the belt tension. Place the gauge on the belt at the
midpoint between the two pulleys. If the belt has more than 3/16” at 9 lb. of deflection,
tighten the belt as described below.
4. Loosen the upper pivot, lower pivot and the adjustment bolt jam nut.
5. Turn the belt tension adjustment bolt clockwise to tighten the belt, counterclockwise to
loosen the belt. Adjust the bolt until the proper belt tension is achieved.
CAUTION! Do not overtighten the alternator belt. Damage to the alter-
nator will occur.
FIG. 3-1
100
Belt Adjustment
Bolt
Jam Nut Upper Pivot
Lower
Pivot
3H0748-11

Maintenance
RPM Adjustments
Maintenance WM doc 9/18/19 3-4
3
6. After the alternator belt has been tensioned, tighten the adjustment bolt jam nut. Tighten
the upper and lower pivots and replace the belt covers.
3.7 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 every 200 hours of operation.
See Table 3-1.
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. NOTE: It is important that the
above components 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 3600. 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.
3.8 Miscellaneous Maintenance
Clean and inspect the spark arrester every 50 hours of operation. Replace if damaged.
Engine High End RPM Low End RPM
G38 3600 1500
TABLE 3-1
200
50

Maintenance
Miscellaneous Maintenance
3
3-5 WM doc 9/18/19 Maintenance
Review the manufacturer's engine manual for maintenance intervals.

Replacement Parts
Fuel Tank (G28/G29/G38)
Replacement Parts G3807doc091819 4-1
G38 4
SECTION 4 REPLACEMENT PARTS
4.1 Fuel Tank (G28/G29/G38)
LT40 Rev. K4.08+
LT40 Super Rev. J7.17+
LT40HD Rev. K6.09+
LT40HD Super Rev. K3.17+
LT50 Rev. A5.17+
REF DESCRIPTION ( Indicates Parts Available In Assemblies Only) PART # QTY.
TRAY ASSEMBLY, GAS CAN 074821 1
1Tank, 5 Gallon Low Pro EPA Fuel 103878 1 1
2Grommet, Shut Off 061250 1
3Gas Cap, LT15 061251 1
4Valve, Slosh 061252 1
5Grommet, Slosh Valve 061253 1
6Fitting, Fuel Pick-Up With Shut-Off 074943 1
1
3
2
5
4
6
13
7
9
3H1166C
15
17
18
16
15
9
14
8
12
11
11

Replacement Parts
Fuel Tank (G28/G29/G38)
4-2 G3807doc091819 Replacement Parts
G38
4
7Tank Weldment, Fuel LT40/50 103943 1
8Cover, Fuel Tank 103867 1
9Strap, 20" Rubber P11668 3
10 Bolt, 1/4-20 X 1" Carriage Head F05005-34 3
11 Nut, 1/4-20 Hex Lock F05010-21 5
12 Bolt, 1/4-20 x 3/4” Carriage F05005-113 2
13 Clamp, 1/2” EMT Coated P07584 6
14 Washer, 1/4” SAE Flat F05011-11 2
15 Bolt, 1/4-20 x 3/4” Hex Head Grade 5 F05005-123 3
16 Bolt, 5/16-18 x 1/2” Hex Head Grade 5 F05006-15 4
17 Washer, 5/16” Split Lock F05011-13 4
18 Washer, 5/16” SAE Flat F05011-17 4
Hose, Fuel 3/16" EPA 15G CARB R02423-1 8 Ft.
Hose, Fuel 1/4" EPA 15G CARB R02423-2 8 Ft.
1 Fuel shut-off valve added to fuel tank to prevent possibility of fuel feeding back into engine during travel (LT40 Rev. K4.10/LT40HD
Super Rev. K3.20/LT40HD Rev. K6.12/LT50 Rev. A5.20). Created service part 074943 Fuel Pick-Up with Shut-Off Fitting.

Replacement Parts
Fuel Tank (G28/G29/G38)
Replacement Parts G3807doc091819 4-3
G38 4
4.2 Fuel Tank (G28/G29/G38)
LT40 Rev. K4.06 - K4.07
LT40 Super Rev. J7.16
LT40HD Rev. K6.07 - K6.08
LT40HD Super Rev. K3.15 - K3.16
LT50 Rev. A5.15 - A5.16
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, FUEL 1/4" EPA 15G CARB R02423-2 6.67 Ft
5 CLAMP, 7/32” - 1/2” HOSE P649 4
1
2
3
4
5
3H1163

Replacement Parts
Fuel Tank (G26/G29/G38) (2010+)
4-4 G3807doc091819 Replacement Parts
G38
4
4.3 Fuel Tank (G26/G29/G38) (2010+)
LT40 Prior to Rev. K4.06
LT40 Super Prior to Rev. J7.16
LT40HD Prior to Rev. K6.07
LT40HD Super Prior to Rev. K3.15
LT50 Prior to Rev. A5.15
REF DESCRIPTION ( Indicates Parts Available In Assemblies Only) PART # QTY.
TANK ASSEMBLY, 6 GALLON GAS SERVICE 074643 1
1 Customers with sawmills and edgers manufactured in 2010 and later need to use new EPA approved 3 or 6 gallon gas can assem-
blies (see technical bulletin TB150005 for more information). 5 gallon gas can assemblies are available only for customers with
sawmills and edgers manufactured prior to 2010 (See Section 4.4).
1
1Tank, Gas 076478 1 
2Fitting, 1/4” NPT Male Quick Disconnect 015583 1
3 FITTING, FEMALE QUICK DISCONNECT BARB 015582 1
4 HOSE, FUEL 1/4" EPA 15G CARB R02423-2 6.67 Ft
5 CLAMP, 7/32” - 1/2” HOSE P649 4
1
2
3
4
5
3H1163-2

Replacement Parts
Fuel Tank (G26/G29/G38) (Pre-2010)
Replacement Parts G3807doc091819 4-5
G38 4
4.4 Fuel Tank (G26/G29/G38) (Pre-2010)
LT40 Prior to Rev. K4.06
LT40 Super Prior to Rev. J7.16
LT40HD Prior to Rev. K6.07
LT40HD Super Prior to Rev. K3.15
LT50 Prior to Rev. A5.15
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 (see technical
bulletin TB150005 for more information). Customers with sawmills and edgers manufactured in 2010 and later need to use new
EPA approved 3 or 6 gallon gas can assemblies(See Section 4.3).
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 6.75 Ft
7 CLAMP, 7/32 - 1/2 HOSE P649 6
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 (G28/G29/G38)
4
4-6 G3807doc091819 Replacement Parts
G38
4.5 Engine Mount Assembly (G28/G29/G38)
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 G3807doc091819 4-7
4
G38
4.6 Engine Assembly
REF DESCRIPTION ( Indicates Parts Available In Assemblies Only) PART # QTY.
COVER, G38 ENGINE CEG38 1
ENGINE ASSEMBLY, 38HP EFI KOHLER 079385 1
1Engine, 38Hp Kohler ECH980-3020 079384 1
2Air Cleaner, Kohler 38HP N/A 1
Filter, Kohler Primary Air #25-083-01-S 046553 1
Filter, Kohler Secondary Air #25-083-04-S 046554 1
3Filter, Kohler Oil #52-050-02-S 014717 1
Plug, Kohler G35 (G38) Spark #62-132-04-S 061003 2
Pump, Fuel #62-559-01S 061156 1
4Washer, 3/8” SAE Flat F05011-3 4
5Bolt, 3/8-16 x 2” Hex Head Grade 5 F05007-124 4
6Nut, 3/8-16 Hex Nylon Lock F05010-10 4
7Fitting, 1/2” MPT x 3/8” FPT Reducer Bushing 003227 1
8Hose, 7" Oil Drain P10082 1
9Cap, Oil Drain 3/8" Pipe P04332 1
10 Pulley, 5V x 4.06” x 8.5” Poly-V 003206 1
11 Bushing, 1 7/16” SH 016535 1
CHOKE
15
1
4
5
4
6
78
9
10
11
21 18
19
20
13
12
14
3H1178-1B
22
2
3
16
17
23
24
25
26

Replacement Parts
Engine Assembly
4
4-8 G3807doc091819 Replacement Parts
G38
12 Grip, 1/16” x 3/8” x 1 1/2” Black 003229 1
13 Bracket, Throttle Mount 003222 1
14 Cable Assembly, G35 (G38) Throttle 034809 1
15 Decal, Choke ID 003230 1
16 Alternator Parts (See Section 4.4)1
17 Engine Mount Parts (See Section 4.2)1
Muffler 110658 1
18 Spark Arrestor, 1 1/2" Dia 110660 1
19 Pipe, 1 1/2 Exhaust Connector 110659 1
20 Clamp, 1 1/2 Muffler P09900 1
Starter Assembly, #25 098 21S 061371 1
21 FILTER, KOHLER FUEL #24-050-13 P12758 1
22 BELT, 3/5VL750 DRIVE 006672 1
23 BRACKET WDMT, CLUTCH ENHANCEMENT 015058 1
24 BOLT, 3/8-16X1 HH F05007-7 2
25 WASHER, #/8 FLAT SAE F05011-3 4
26 NUT, 3/8-16 HEX NYL LOCK F05010-10 2