woodmizer LT28 Guide

WARNING! Read and understand this
manual before using this machine.
!
LT28 G18/19 Engine
Safety, Operation, Maintenance
& Parts Manual
049055 Engine, Gas 19hp rev. D
Safety is our #1 concern!
Form #1343
Used with:
LT28G18 rev. A6.02 - A6.10
LT28G19 rev. A6.11 - A6.17
The G18 engine was re-designated as G19
on /30/2015 per ECN 20372 to match the
actual rating of the engine.

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©2023 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

Table of Contents Section-Page
Table of Contents WM doc 1/15/24 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............................................................................................... 3-1
3.5 Battery.................................................................................................... 3-1
3.6 RPM Adjustments.................................................................................. 3-2
3.7 Miscellaneous Maintenance................................................................... 3-2
SECTION 4 REPLACEMENT PARTS 4-1
4.1 Fuel Tank 4/2022+ ............................................................................. 4-1
4.2 Fuel Tank A6.12 - 4/2022 ...................................................................... 4-2
4.3 Fuel Tank Rev. A6.10 - A6.11............................................................... 4-3
4.4 Fuel Tank Rev. A3.00 - A6.09............................................................... 4-4
4.5 Fuel Tank Rev. A3.00 - A6.09............................................................... 4-5
4.6 Fuel Tank Rev. A1.00 - A2.01............................................................... 4-7
5.7 Engine Assembly ................................................................................... 5-2
5.8 Throttle/Clutch Assembly...................................................................... 5-4

1
1-1 WM doc 1/15/24
SECTION 1 ABOUT THIS MANUAL
This manual is provided as a supplement to the equipment manufacturer’s manuals. This manual provides information spe-
cific 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

Operation
Starting The Engine 2
Operation WM doc 1/15/24 2-1
SECTION 2 OPERATION
2.1 Starting The Engine
DANGER! Always be sure the blade is disengaged and clear the path of the blade before starting
the engine. Failure to do so will result in serious injury or death.
Operate your engine/machine only in well ventilated areas.Exhaust gases can cause nausea,
delirium and potentially death unless adequate ventilation is present.
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! 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.
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.
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 moving the choke lever to the start position.
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 open the choke all the way by moving the choke lever to the off position.
ENGINE SHUTOFF
1. Disengage the clutch handle to stop the blade if necessary.
2. Run the engine for 15 seconds with no load, then turn the key switch to the OFF position.

Maintenance
Safety
3
3-1 WM doc 1/15/24 Maintenance
SECTION 3 MAINTENANCE
Refer to the manufacturer’s manual for maintenance intervals and procedures unless otherwise instructed in this manual.
Follow the manufacturer’s recommendations for dusty conditions.
NOTICE 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 man-
ufacturer's manual for complete maintenance instructions.
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, pul-
leys, fans, etc.
Always stay a safe distance from rotating members and make sure that loose clothing or long
hair does not engage rotating members.
Never touch or perform service functions on a hot engine.
WARNING! Remove the blade before performing any engine service. Failure to do so may result
in serious injury.
Wear proper (eye, breathing, hand, and foot) safety equipment when performing service func-
tions.
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.
3.2 Cooling System
Wash the engine or brush off sawdust and debris every 50 hours of operation.
Clean any screens, cooling fins, and all external surfaces.
Remove any dust, dirt, or oil.
See engine manual for further instructions.
3.3 Air Filter & Pre-Cleaner
Service the pre-cleaner every four hours of operation 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.
Replace the air filter (cleaner) every 200 hours of operation.
Replace the pre-cleaner (element wrapper) every 2000 hours of operation.
See the engine manual for further instructions.
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.

Maintenance
RPM Adjustments 3
Maintenance WM doc 1/15/24 3-2
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.
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).
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.
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.
3.7 Miscellaneous Maintenance
Inspect the spark plugs every 100 hours of operation.
Remove any deposits and adjust gap if necessary.
Review the manufacturer's engine manual for maintenance intervals.
See engine manual for further information.
Engine High End RPM Low End RPM
G19 3750 1800
TABLE 3-1

Replacement Parts
Fuel Tank 4/2022+
4
4-1 WM doc 1/15/24 Replacement Parts
SECTION 4 REPLACEMENT PARTS
4.1 Fuel Tank 4/2022+
REF PART # DESCRIPTION COMMENTS QTY.
133037 Assembly, Fuel Tank Tray, LT28/35
1P702 Grommet, 7/8In IDx1 1/4In Groove Dia 1
2P05393 Barb, 1/4 Hose 1/4NPT 1
3P851 Valve, Fuel, In Line Shut Off 1
4P649 Hose Clamp, 7/32in-5/8in 2
5F05010-10 Nut, 3/8-16 Hex Nyl Lock 3
6F05011-3 Washer, 3/8 Flat SAE 6
7F05007-73 Bolt, 3/8-16x3 HH Gr5 3
8F05011-17 Washer, 5/16 SAE Flat 4
9F05011-13 Washer, 5/16 Split Lock 4
10 F05006-15 Bolt, 5/16-18x1/2 HH Gr5 4
11 130288 Cover Weldment, Fuel Tank, Domestic 1
12 130286 Fuel Tank, Domestic 6 Gal 1
133484 Assy, 6.50" Portable Tank Pick Up 1
133483 Cap, 2.25" One Way Kelch 1
133438 Kit, Slant Roll Valve 1
133485 Cap, Ultra 3/6/12 Lens 1
13 103810 Weldment, Fuel Tank Tray 1
14 130283 Extension, Fuel Tray 1
15 F05006-86 Bolt, 5/16-18x3/4 Carriage 2
16 F05010-221 Nut, 5/16-18 Flanged Hex Nylock 2
R02423-1 Hose, Fuel 3/16" EPA 15G CARB 6 Ft
R02423-2 Hose, Fuel 1/4" EPA 15G CARB 6 Ft

Replacement Parts WM doc 1/15/24 4-2
Replacement Parts
Fuel Tank A6.12 - 4/2022 4
4.2 Fuel Tank A6.12 - 4/2022
REF PART # DESCRIPTION COMMENTS QTY.
103816 TRAY ASSEMBLY, LT28/35 FUEL TANK 1
1103810 Weldment, Fuel Tank Tray 1
2103867 Cover, Fuel Tank 1
3103878 Tank, 5 Gallon Low Pro EPA Fuel 1
4061250 Grommet, Shut Off 1
5061251 Gas Cap, LT15 1
6061252 Valve, Slosh 1
7061253 Grommet, Slosh Valve 1
8074943 Fitting, Fuel Pick-Up With Shut-Off 1
9F05006-15 Bolt, 5/16-18 x 1/2” Hex Head Grade 5 4
10 F05007-73 Bolt, 3/8-16 x 3” Hex Head Grade 5 3
11 F05010-10 Nut, 3/8-16 Hex Nyloc 3
12 F05011-3 Washer, 3/8” Flat SAE 6
13 F05011-13 Washer, 5/16” Split Lock 4
14 F05011-17 Washer, 5/16” SAE Flat 4
R02423-1 Hose, Fuel 3/16" EPA 15G CARB 6 Ft
R02423-2 Hose, Fuel 1/4" EPA 15G CARB 6 Ft

Replacement Parts
Fuel Tank Rev. A6.10 - A6.11
4
4-3 WM doc 1/15/24 Replacement Parts
4.3 Fuel Tank Rev. A6.10 - A6.11
REF PART # DESCRIPTION COMMENTS QTY.
076479 TRAY ASSEMBLY, LT28 GAS CAN 1
074643 Tank Assembly, 6 Gallon Gas Service 1
1076478 Tank, Gasoline Available in assemblies only. 1
2015583 Fitting, 1/4” NPT Male Quick Disconnect 1
3015582 Fitting, Female Quick Disconnect Barb 1
4P649 Clamp, 7/32” - 1/2” Hose 2
5076480 Tray Weldment, LT28 Fuel 1
6F05005-34 Bolt, 1/4-20 X 1” Carriage 2
7F05010-21 Nut, 1/4-20 Swaged 2
8P11668 Strap, 20 Rubber W/Hooks 2
9F05007-29 Bolt, 3/8-16 x 2 3/4” Hex Head 2
10 F05011-3 Washer, 3/8” SAE Flat 2
11 F05010-10 Nut, 3/8-16 Hex Nylon Lock 2
R02423-2 Hose, Fuel 1/4" EPA 15G CARB 6.1 Ft

Replacement Parts WM doc 1/15/24 4-4
Replacement Parts
Fuel Tank Rev. A3.00 - A6.09 4
4.4 Fuel Tank Rev. A3.00 - A6.09
REF PART # DESCRIPTION COMMENTS QTY.
076479 TRAY ASSEMBLY, LT28 GAS CAN 1
074643 Tank Assembly, 6 Gallon Gas Service 5 gallon gas can assemblies are
available only for customers
with sawmills and edgers manu-
factured prior to 2010 (See Sec-
tion 4.4).
1
1076478 Tank, Gasoline Available in assemblies only. 1
2015583 Fitting, 1/4” NPT Male Quick Disconnect 1
3015582 Fitting, Female Quick Disconnect Barb 1
4P649 Clamp, 7/32” - 1/2” Hose 2
5076480 Tray Weldment, LT28 Fuel 1
6F05005-34 Bolt, 1/4-20 X 1” Carriage 2
7F05010-21 Nut, 1/4-20 Swaged 2
8P11668 Strap, 20 Rubber W/Hooks 2
9F05007-29 Bolt, 3/8-16 x 2 3/4” Hex Head 2
10 F05011-3 Washer, 3/8” SAE Flat 2
11 F05010-10 Nut, 3/8-16 Hex Nylon Lock 2
R02423-2 Hose, Fuel 1/4" EPA 15G CARB 6.1 Ft

Replacement Parts
Fuel Tank Rev. A3.00 - A6.09
4
4-5 WM doc 1/15/24 Replacement Parts
4.5 Fuel Tank Rev. A3.00 - A6.09
REF PART # DESCRIPTION COMMENTS QTY.
049138 TRAY ASSEMBLY, LT28 GAS CAN 1
074664 Assy, 3 Gallon Gas Tank, Single Line Replaced A12285 for service
after 9/28/23 per ECN 39168
1
1X200-1144 Can, 3 Gallon Gas 1
2015583 Fitting, 1/4 NPT Male Quick Disconnect 1
3015582 Fitting, Female Quick Disconnect Barb 1
A12285 Tank Assembly, 5-gallon Red Gasoline Customers with sawmills manu-
factured in 2010
and later need to use new EPA
approved 3 or 6 gallon gas can
assemblies.Replace with
074664.
1
P12167 Tank, 5-Gallon Red Fuel Deleted after 9/28/2023 per
ECN 39168
1
P12172 Pickup, 9" Fuel 1
P09683 Cap, 3 or 5-Gallon Fuel Tank 1
P12175 Fitting, 1/4" NPT Plastic Female Discon-
nect
1
P10367 Fitting, 3/8” NPT Hex Plug 1
4P642 Hose, 1/4” ID Fuel 4 Ft
5P649 Clamp, 7/32 - 1/2 Hose 2
6P12176 Fitting, 1/4" NPT Plastic Male Disconnect 1
7048600 Tray Weldment, LT28 Fuel 1
8F05005-34 Bolt, 1/4-20 X 1” Carriage 2

Replacement Parts WM doc 1/15/24 4-6
Replacement Parts
Fuel Tank Rev. A3.00 - A6.09 4
9F05010-21 Nut, 1/4-20 Swaged 2
10 P11258 Strap, 24 Rubber W/Hooks 2
11 F05007-29 Bolt, 3/8-16 x 2 3/4” Hex Head 2
12 F05011-3 Washer, 3/8” SAE Flat 2
13 F05010-10 Nut, 3/8-16 Hex Nylon Lock 2
REF PART # DESCRIPTION COMMENTS QTY.

Replacement Parts
Fuel Tank Rev. A1.00 - A2.01
4
4-7 WM doc 1/15/24 Replacement Parts
4.6 Fuel Tank Rev. A1.00 - A2.01
REF PART # DESCRIPTION COMMENTS QTY.
049138 TRAY ASSEMBLY, LT28 GAS CAN 1
074664 Assy, 3 Gallon Gas Tank, Single Line Replaced A12285 for service
after 9/28/23 per ECN 39168
1
1X200-1144 Can, 3 Gallon Gas 1
2015583 Fitting, 1/4 NPT Male Quick Disconnect 1
3015582 Fitting, Female Quick Disconnect Barb 1
A12285 Tank Assembly, 5-gallon Red Gasoline Customers with sawmills manu-
factured in 2010
and later need to use new EPA
approved 3 or 6 gallon gas can
assemblies.Replace with
074664.
1
P12167 Tank, 5-Gallon Red Fuel Deleted after 9/28/2023 per
ECN 39168
1
P12172 Pickup, 9" Fuel 1
P09683 Cap, 3 or 5-Gallon Fuel Tank 1
P12175 Fitting, 1/4" NPT Plastic Female Discon-
nect
1
P10367 Fitting, 3/8” NPT Hex Plug 1
4P642 Hose, 1/4” ID Fuel 4 Ft
5P649 Clamp, 7/32 - 1/2 Hose 2

Replacement Parts WM doc 1/15/24 4-8
Replacement Parts
Fuel Tank Rev. A1.00 - A2.01 4
6P12176 Fitting, 1/4" NPT Plastic Male Disconnect 1
7049137 Tray Weldment, LT28 Fuel . 1
8F05005-34 Bolt, 1/4-20 X 1” Carriage 2
9F05010-21 Nut, 1/4-20 Swaged 2
10 P11258 Strap, 24 Rubber W/Hooks 2
11 F05007-87 Bolt, 3/8-16 x 1” Hex Head Grade 5 3
12 F05011-4 Washer, 3/8” Split Lock 3
13 F05011-3 Washer, 3/8” SAE Flat 3
REF PART # DESCRIPTION COMMENTS QTY.

Replacement Parts
Engine Assembly
5
5-2 WM doc 1/15/24 Replacement Parts
5.7 Engine Assembly
REF PART # DESCRIPTION COMMENTS QTY.
P12393 COVER, ENGINE 1
049055 ENGINE ASSEMBLY, LT28 GAS 19HP 1
1016899 Engine, 19HP Kohler #PA62590 Available in assemblies only. 1
2006907 Filter, Kohler Air #47-083-03 1
3006931 Pre Cleaner, Kohler #24-083-02 1
P12757 Plug, RC12YC Kohler Spark #12-132-02 2
4014717 Filter, Kohler Oil #52-050-02 1
5P12758 Filter, Kohler Fuel #24-050-13 1
061371 Starter, Kohler Engine KH# 25 098 21S 1
048391 Pump, Kohler Fuel #24-393-16S 1
061150 Switch, Ignition G18/25 1
6038432 Bushing, 1 1/8” SH 1
7047742 Pulley, 3V5.6 x 2” SH 1
8F05011-48 Washer, 7/16” Split Lock 2
9F05007-145 Bolt, 7/16-14 x 1” Hex Head Grade 5 2
10 016493 Plate, Engine Guard 1
11 047750 Plate, Throttle Cable Mount 1
12 047749 Cable, LT15 G25 Throttle 1
13 016033 Spring, Throttle 1
14 015952 Spring, Throttle Extension 1
15 P10082 Hose, 3/8” NPT Oil Drain 1
16 P04332 Cap, Oil Drain Hose 1
061072 Switch, G18/G25 Ignition Plastic 1

Replacement Parts WM doc 1/15/24 5-3
Replacement Parts
Engine Assembly 5
17 F05007-119 BOLT, 3/8-16 X 1 3/4” HEX HEAD GRADE 5 4
18 F05011-3 WASHER, 3/8” SAE FLAT 4
19 F05010-10 NUT, 3/8-16 HEX NYLON LOCK 4
20 048237 SUPPORT WELDMENT, DRIVE BELT 1
21 F05007-118 BOLT, 3/8-16 X 3/4” HEX HEAD GRADE 5 1
22 F05010-19 NUT, 3/8-16 SELF-LOCKING HEX 1
23 047751 BELT, 2/3VFL900 DRIVE 1
061326 CARB KIT, G18 DE-ICING 24 755 64S 1
REF PART # DESCRIPTION COMMENTS QTY.

Replacement Parts
Throttle/Clutch Assembly
5
5-4 WM doc 1/15/24 Replacement Parts
5.8 Throttle/Clutch Assembly
REF PART # DESCRIPTION COMMENTS QTY.
1065574 BLOCK WELDMENT, LINKAGE CLUTCH/BRAKE Replaces 049139 to make
clutch pivot stop adjustable
(Rev. A6.05). T
1
2F05012-16 PIN, 3/16” X 1 1/4” ROLL 1
3016486 BUSHING, 5/8” ID X 7/8” OD X 1 1/4” LONG FL
BRONZE
2
4049340 SHAFT, LT28 THROTTLE 1
5034815 ACTUATOR WELDMENT, THROTTLE LT15D&G 1
6F05007-68 SCREW, 3/8-16 X 3/8” SOCKET HEAD CUP PT
SET
2
7034818 LINKAGE, THROTTLE LT15D&G 1
8F05005-15 BOLT, 1/4-20 X 1/2” HEX HEAD 1
9F05010-21 NUT, 1/4-20 SWAGED 1
10 P737 BUSHING, 1” X 1 1/4” X 3/4” FLANGED BRONZE 2
11 034608 PIVOT WELDMENT, CLUTCH/BRAKE 1
034605 LINKAGE ASSEMBLY, W/BEARING 1
12 034604 Boss Weldment, Clutch/Brake Linkage 1
13 016486 Bushing, 5/8” ID x 7/8” OD x 1 1/4” Long
Flanged Bronze
1
038778 NUT ASSEMBLY, 1/2-13 SPRING LOCKING Spring Locking Nut Assembly
038778 added Rev. A3.00
(replaces F05010-35 1/2-13
Hex Nut and F05011-9 1/2" Split
Lock Washer).
1

Replacement Parts WM doc 1/15/24 5-5
Replacement Parts
Throttle/Clutch Assembly 5
14 F05010-31 Nut, 1/2-13 Hex Jam 1
15 038777 Nut, 1/2-13 Spring Lock 1
16 046975 Spring, .72” OD x .576” ID x 1.25L Compression 1
17 F05010-127 Nut, 1/2-13 Half Nylon Lock 1
065874 BRAKE/CLUTCH ASSEMBLY 1
18 065873 Arm Weldment, Clutch/Brake 1
19 F05007-124 Bolt, 3/8-16 x 2 Hex Head Grade 5 1
20 F05010-10 Nut, 3/8-16 Hex Nyl Lock 2
21 F05011-3 Washer, 3/8” Flat SAE 3
22 F05010-25 Nut, 3/8-16 Swaged 1
23 034810 Spring, Idler Arm LT15/D/E/G 1
24 034602 Idler, 4" O.D. x 3/8” Bore 1
25 F05007-125 Bolt, 3/8-16 x 2-1/2” Hex Head Grade 5 1
26 016488 Block, LT15 Brake 2
27 F05004-2 Bolt, #10-24 x 1” Socket Head Cup 4
28 F05010-14 Nut, #10-24 Keps 8
29 F05004-282 Screw, 10-24 x 5/8” FSHC 4
30 065872 Plate, Brake Adjustment 2
31 F05011-18 Washer, #10 SAE Flat 4
32 F05010-29 NUT, 3/8-16 JAM 1
33 F05007-18 SCREW, 3/8-16 X 1 1/4 SHOP SET 1
REF PART # DESCRIPTION COMMENTS QTY.