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Class 4 Forklift Definition – Internal Combustion Engine Trucks with Cushion Tires

Published time：

2026-07-28

Author：

Xin Hong Guang

Source：

Xin Hong Guang

Abstract

A Class 4 forklift is an internal combustion engine (ICE) truck equipped with solid or cushion tires. These sit‑down, counterbalanced trucks are designed primarily for indoor use on smooth, flat surfaces such as warehouse floors, loading docks, and manufacturing facilities.Key CharacteristicsPower Source: Powered by an internal combustion engine that runs on gasoline, diesel, liquid propane (LPG), or compressed natural gas (CNG).Tires: Fitted with cushion (solid) tires, which provide stability and durability on smooth indoor surfaces.Counterbalanced: The weight of the truck itself (including a rear counterweight) balances the load on the front forks.Operator Position: The operator sits in a cab with seated controls.Common ApplicationsClass 4 forklifts are most effective in environments with low clearance and smooth floors, including:Indoor warehouses and distribution centersLoading docksMoving goods from docks to storage areasFacilities where electric recharging infrastructure is not a

A Class 4 forklift is an internal combustion engine (ICE) truck equipped with solid or cushion tires. These sit‑down, counterbalanced trucks are designed primarily for indoor use on smooth, flat surfaces such as warehouse floors, loading docks, and manufacturing facilities.


Key Characteristics


Power Source: Powered by an internal combustion engine that runs on gasoline, diesel, liquid propane (LPG), or compressed natural gas (CNG).


Tires: Fitted with cushion (solid) tires, which provide stability and durability on smooth indoor surfaces.


Counterbalanced: The weight of the truck itself (including a rear counterweight) balances the load on the front forks.


Operator Position: The operator sits in a cab with seated controls.


Common Applications


Class 4 forklifts are most effective in environments with low clearance and smooth floors, including:


Indoor warehouses and distribution centers


Loading docks


Moving goods from docks to storage areas


Facilities where electric recharging infrastructure is not available


Class 4 vs. Class 5 – The Tire Difference


The primary distinction between Class 4 and Class 5 forklifts is the tire type:


Feature Class 4 Class 5

Tires Cushion (solid) Pneumatic (air‑filled)

Primary Use Indoor, smooth surfaces Indoor/outdoor, uneven terrain

Ground Clearance Lower Higher

OSHA Training Requirements


OSHA requires that operators of Class 4 forklifts receive specific training and certification under 29 CFR 1910.178(l) before operating the equipment. Training must cover:


Safe operating procedures, including starting, maneuvering, lifting, and parking


Recognition of workplace hazards


Employer responsibilities and OSHA regulations


Operators must be evaluated at least once every three years.


Summary


Class 4 forklifts are internal combustion trucks with cushion tires, designed for indoor use on smooth surfaces. They are counterbalanced, sit‑down rider trucks powered by gasoline, diesel, LPG, or CNG. Their solid tires provide stability on flat floors but limit their use outdoors or on rough terrain. OSHA requires specific training and certification for Class 4 forklift operators under 29 CFR 1910.178(l).

Keywords：
forklift class 4
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