woodmizer LT28 G25 Guide

LT28 G25 Engine
Safety, Operation, Maintenance
& Parts Manual
Used with the
LT28G25 rev. A6.15
Safety is our #1 concern! Read and understand
all safety information and instructions before oper-
ating, setting up or maintaining this machine.
Form #1353

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©2022 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 photographic, electronic, mechanical or other means or used in any information storage and retrieval system with-
out written permission from
Wood-Mizer, LLC
8180 West 10th Street
Indianapolis, Indiana 46214
California
Proposition 65 Warning
WARNING:
Breathing gas/diesel engine exhaust exposes you to chemicals known to
the State of California to cause cancer and birth defects or other reproductive harm.
Always start and operate the engine in a well-ventilated area.
If in an enclosed area, vent the exhaust to the outside.
Do not modify or tamper with the exhaust system.
Do not idle the engine except as necessary.
For more information go to www.P65warnings.ca.gov.
WARNING: Drilling, sawing, sanding or machining wood products can expose you to
wood dust, a substance known to the State of California to cause cancer. Avoid inhaling
wood dust or use a dust mask or other safeguards for personal protection.
For more information go to www.P65Warnings.ca.gov/wood.

Table of Contents Section-Page
Table of Contents WMdoc091622 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 Maintenance ...........................................................................................3-1
3.2 Safety......................................................................................................3-1
3.3 Cooling System ......................................................................................3-1
3.4 Air Filter & Pre-Cleaner.........................................................................3-1
3.5 Fuel Filter ...............................................................................................3-2
3.6 Battery ....................................................................................................3-2
3.7 RPM Adjustments ..................................................................................3-2
3.8 Miscellaneous Maintenance ...................................................................3-3
SECTION 4 REPLACEMENT PARTS 4-1
4.1 Fuel Tank................................................................................................4-1
LT28 Rev. A6.12+
4.2 Fuel Tank................................................................................................4-2
LT28 Rev. A6.10 - A6.11
4.3 Fuel Tank (2010+)..................................................................................4-3
LT28 Rev. A3.00 - A6.09
4.4 Fuel Tank (Pre-2010) .............................................................................4-4
LT28 Rev. A3.00 - A6.09
4.5 Fuel Tank................................................................................................4-6
LT28 Rev. A1.00 - A2.01
4.6 Engine Assembly....................................................................................4-8
LT28 Rev. A4.02+
4.7 Engine Assembly..................................................................................4-10
LT28 Rev. A1.00 - A4.01
4.8 Throttle/Clutch Assembly ....................................................................4-12

About this Manual
1
1-1 WM doc 9/16/22 About this Manual
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 manufacturer’s
manual for instructions and safety precautions before operating this equip-
ment.
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.
Muffler
Air Filter
Fuel Filter
Serial Number/
Engine Type
150134-1
Choke
Key
Switch
Oil Drain

Operation
Starting The Engine 2
Operation WM doc 9/16/22 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.
DANGER! Operate your engine/machine only in well ventilated areas.Exhaust
gases can cause nausea, delirium and potentially death unless adequate ven-
tilation 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! Do not operate engine without proper and operational spark
arrester/muffler. Sparks emitted from the engine exhaust could ignite sur-
rounding 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.
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 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
Maintenance
3
3-1 WM doc 9/16/22 Maintenance
SECTION 3 MAINTENANCE
3.1 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.
3.2 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.
3.3 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.
3.4 Air Filter & Pre-Cleaner
Service the pre-cleaner every four hours of operation by gently shaking excess sawdust and debris from the foam piece.

Maintenance
Fuel Filter 3
Maintenance WM doc 9/16/22 3-2
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.
3.5 Fuel Filter
Replace the fuel filter every 100 hours of operation or as required for engine performance.
3.6 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
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.
3.7 RPM Adjustments
WARNING! Remove the blade before performing any engine service. Fail-
ure 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.
Check that the cable spring, cable guide, cable, and throttle brackets are aligned.
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.
Engine High End RPM Low End RPM
G25 3600 1800

Maintenance
Miscellaneous Maintenance
3
3-3 WM doc 9/16/22 Maintenance
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 arresters every 50 hours of operation. Replace if damaged.
CAUTION! Do not remove the plug wire to check for electrical spark. Dam-
age to the ignition circuit will result.
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.

Replacement Parts WM doc 9/16/22 4-1
Replacement Parts
Fuel Tank 4
SECTION 4 REPLACEMENT PARTS
4.1 Fuel Tank
LT28Rev. A6.12+
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
1
2
5
3
7
4
6
8
9
13
14
10
11
12
280061C

Replacement Parts
Fuel Tank
4
4-2 WM doc 9/16/22 Replacement Parts
4.2 Fuel Tank
LT28Rev. 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
1
3
2
4
5
6
7
8
910 11
280060