Liqueﬁed Petroleum Gas (LPG) or LPG/Natural Gas (NG) Fueled - Service Manual - Maintenance Instructions - Safety Precautions

Oct 23, 2026

Service manual maintenance instructions for engines fueled by liquefied petroleum gas (LPG) or LPG/natural gas (NG). Includes safety precautions and warnings emphasizing explosive, flammable fuel hazards; rotating and hot-part risks; and carbon monoxide dangers. Provides guidance to disable the engine before servicing, disconnect spark plug leads and the negative battery cable, and observe legal requirements for LPG/NG systems. Also lists a maintenance schedule by operating hours, covering air cleaner service, lubrication actions, fuel system checks, and electrical inspections.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages88

Reading Time3 h 42 min

AccessFree to download

Safety Precautions

WARNING

CAUTION

Maintenance Instructions

Maintenance Schedule

Air Cleaner/Intake

Fuel System

Lubrication System

Electrical System

Troubleshooting

CH18, CH20, CH23, CH25, CH640, CH730, CH740 Liqueﬁed Petroleum Gas (LPG) or LPG/Natural Gas (NG) Fueled Service Manual IMPORTANT: Read all safety precautions and instructions carefully before operating equipment. Refer to operating instruction of equipment that this engine powers. Ensure engine is stopped and level before performing any maintenance or service. 2 Safety 3 Maintenance 5 Speciﬁcations 13 Tools and Aids 16 Troubleshooting 20 Air Cleaner/Intake 21 Fuel System 30 Governor System 32 Lubrication System 34 Electrical System 50 Starter System 57 Disassembly/Inspection and Service 73 Reassembly Safety SAFETY PRECAUTIONS WARNING: A hazard that could result in death, serious injury, or substantial property damage. CAUTION: A hazard that could result in minor personal injury or property damage. NOTE: is used to notify people of important installation, operation, or maintenance information. | | WARNING | | --- | --- | | | Explosive Fuel can cause ﬁres and severe burns.
If a gaseous odor is detected, ventilate area and contact an authorized service technician. | | LPG is extremely ﬂammable and is heavier than air and tends to settle in low areas where a spark or ﬂame could ignite gas. Do not start or operate this engine ina poorly ventilated area where leaking gas could accumulate and endanger safety of persons in area.
NG is extremely ﬂammable, is lighter than air, and rises. Do not start or operate this engine ina poorly ventilated area where leaking gas could accumulate and endanger safety of persons in area.
To ensure personal safety, installation and repair of LPG/ NG fuel supply systems must be performed only by qualiﬁed LPG/NG system technicians. Improperly installed and maintained LPG/NG equipment could cause fuel supply system or other components to malfunction, causing gas leaks.
Observe federal, state and local laws governing LPG/NG fuel, storage, and systems. | | | | WARNING | | --- | --- | | | Rotating Parts can cause severe injury.
Stay away while engine is in operation. | | Keep hands, feet, hair, and clothing away from all moving parts to prevent injury. Never operate engine with covers, shrouds, or guards removed. | | | | WARNING | | --- | --- | | | Carbon Monoxide can cause severe nausea, fainting or death.
Avoid inhaling exhaust fumes. Never run engine indoors or in enclosed spaces. | | Engine exhaust gases contain poisonous carbon monoxide. Carbon monoxide is odorless, colorless, and can cause death if inhaled. | | | | WARNING | | --- | --- | | | Cleaning Solvents can cause severe injury or death.
Use only in well ventilated areas away from ignition sources. | | Carburetor cleaners and solvents are extremely ﬂammable. Follow cleaner manufacturer’s warningsand instructions on its proper and safe use. Never use gasoline as a cleaning agent. | | | | WARNING | | --- | --- | | | Accidental Starts can cause severe injury or death.
Disconnect and groundspark plug lead(s) before servicing. | | Before working on engine or equipment, disable engine as follows: 1) Disconnect spark plug lead(s) . 2) Disconnect negative (–) battery cable from battery.
Before disconnecting negative (–) ground cable, make sure all switches are OFF. If ON, a spark will occur at ground cable terminal which could cause an explosion if hydrogen gas or LPG/NG fuel vapors are present. | | | | CAUTION | | --- | --- | | | Electrical Shock can cause injury.
Do not touch wires while engine is running. | | | CAUTION | | --- | --- | | | Damaging Crankshaft and Flywheel can cause personal injury. | | Using improper procedures can lead to broken fragments. Broken fragments could be thrown from engine. Always observe and use precautions and procedures when installing ﬂywheel. | | | | WARNING | | --- | --- | | | Hot Parts can cause severe burns.
Do not touch engine while operating or just after stopping. | | Never operate engine with heat

FAQs

What must be done before performing engine maintenance or servicing?

Ensure the engine is stopped and level. Disable the engine by disconnecting spark plug lead(s) and disconnecting the negative (–) battery cable from the battery, with all switches OFF before disconnecting the negative ground cable.

Why is proper ventilation important when using LPG or NG?

LPG and NG are extremely flammable gas fuels. LPG tends to settle in low areas, while NG rises, so leaking gas could accumulate and become hazardous without proper ventilation.

How often should the air cleaner/ intake be serviced?

The schedule specifies servicing the precleaner element every 25 hours, and checking and maintaining the air cleaner/ intake at intervals such as every 100 hours and every 100/150/200 hours entries listed for oil and air cleaner element replacement and cleaning.

Oct 23, 2026

Uploaded by Lucas Martin