Lift Trucks Explained – A Materials Handling Primer

Written by editor on March 12, 2011 – 9:40 am - (32134 views)

Forklifts and Lift Trucks - Materials Handling Equipment

Materials Handling Equipment Primer

 

Forklift Information

Here is a guide to materials handling equipment.  This article is for professionals new to materials handling equipment to gain a basic understanding of the names, terms and uses of various types of equipment for moving and storing products in a warehouse environment.

What is a forklift?

A forklift is a powered piece of equipment designed to lift and transport material in an industrial setting.  Other names for a forklift are: Tow-motor, lift truck, industrial truck, cherry picker and others.   A forklift can be a very versatile and useful piece of equipment and the wide variety of attachments that can be added to a forklift make them even more useful.  There are numerous types of forklifts and they will be discussed in this text.  The intent of this is to give the reader a good working knowledge of the types of forklifts and the nomenclature associated with the components of a forklift.

What types of forklifts are there?

There are several different types of forklifts.  The model that any one operator would use depends on their application.  Most forklifts are designed to work in a specific application but sometimes they can be multi-use.  The types and applications of some of the more common forklifts are as follows.

CLASSES OF FORKLIFTS

The Industrial Truck Association (ITA) has defined seven classes of forklifts.  These classes are defined by the type of engine, work environment (indoors, outdoors, narrow aisle, smooth or rough surfaces), operator (sit down or standing), and equipment characteristics (type of tire, maximum grade).  Several classes are further divided by operating characteristics.  The following are the forklift classifications:

Class 1 forklifts are electric motor trucks with cushion or pneumatic (air filled) tires.  Class 1 forklifts include four subcategories, or lift codes, which are:

• Lift code 1 -    Counterbalanced rider type, stand up.
• Lift code 4 -    Three wheel electric, sit down.
• Lift code 5 -    Counterbalanced rider, cushion tire sit down.
• Lift code 6 -    Counter balanced rider, sit-down rider (includes pneumatic tire models).

Class 2 forklifts are electric motor narrow aisle trucks with solid tires.

Class 3 forklifts include electric hand trucks or hand/rider trucks with solid tires.

Class 4 forklifts are Internal Combustion Engine sit down rider forklifts with cushion tires and generally suitable for indoor use on hard surfaces.

Class 5 forklifts are Internal Combustion Engine sit down rider forklifts with pneumatic tires.  These are typically used outdoors, on rough surfaces, or significant inclines.

Class 6 forklifts can either be electric or Internal Combustion Engine powered.  These are ride on units with the ability to tow at least at least 1000 pounds.  This class is designed to tow cargo rather than lift it.

Class 7 forklifts are rough terrain trucks with pneumatic tires.  Class 7 trucks are almost exclusively powered by diesel engines and are used outdoors.

INTERNAL COMBUSTION (IC) CUSHION TIRE FORKLIFT

These trucks are typically used indoors in applications such as manufacturing, warehousing, bottling and trucking.  They ride on solid rubber tires called cushion tires. They can be powered by either Liquid Petroleum Gas (LPG), gasoline, Diesel, or be dual fuel.  Dual fuel means that the forklift is equipped with both LPG and Gas fuel systems and can be run on either one but not at the same time.  The engine powers all the functions of the truck, drive and hydraulics.  This is a Class 4 forklift.

Links:

INTERNAL COMBUSTION PNEUMATIC TIRE FORKLIFT

This type of forklift is used primarily in outdoor applications where the operating surface may be uneven.  It utilizes larger tires which can either be air filled (pneumatic) or pneumatic shaped solid rubber tires.  Like the Cushion tire truck it can be powered by LPG, Gasoline, Diesel Fuel or can be dual fuel.  Although this type of truck is intended for outdoor use, it does not do well in soft materials such as sand or loose gravel.  This is due to the fact that a forklift really has no suspension and it is not possible to maintain tire to ground contact in uneven environments. These are Class 5 forklifts

Useful links:

TRUCK MOUNTED FORKLIFT

The truck mounted forklift is a very versatile forklift.  It is mounted on the back of a truck and can be carried to the worksite and dismounted there to unload the product right at the site making it unnecessary for the customer to have a forklift at the construction site.  One notable feature of this type of forklift is that the lift cylinder is normally a double acting cylinder.  This means that the cylinder is pressurized when raising or lowering the forks.  This enables the forklift to lift and lower itself using the hydraulics and the forks.  It can be loaded or unloaded from a truck in a matter of minutes.  This type of forklift is very popular with lumber yards, brick yards, and sod farms.

ROUGH TERRAIN FORKLIFT

A rough terrain forklift is designed for carrying material over terrain that a normal pneumatic tired forklift will not.  The most notable feature of the rough terrain forklift is the oversized, aggressive treaded tires.  This enables the machine to traverse bumpy, soft or muddy terrain without getting stuck.  Many models of rough terrain forklifts are also 4-wheel drive.  A rough terrain forklift is a Class 7 forklift.

ELECTRIC SIT DOWN RIDER FORKLIFT

This type of forklift is designed primarily for indoor use.  It is powered by a large industrial battery.  All the functions (drive and hydraulics) are controlled electrically. It looks much like its IC powered counterpart.  The drive system and hydraulic systems are driven by electric motors. They can come in 3 or 4 wheel configurations.  While most electric sit down riders use cushion type tires, some are ordered with a solid pneumatic tire and wheel combination.  The four-wheel versions are Class 4 forklifts.

Four Wheel Sit Down Electric Rider Forklifts:

Three Wheel Electric Sit Down Rider Forklift (Class 1):

Stand Up Counter Balance Electric Rider Forklift (Class 1):

NARROW AISLE TRUCKS

A narrow aisle forklift is designed to operate in warehouses.  It is a stand-up forklift meaning that the operator is standing up while operating the machine.  Its primary function is pulling and placing products on racks inside a warehouse.  It is normally not used to load trucks. A narrow aisle forklift can operate in aisles between racking that is spaced closer together than the rack spacing required for a sit down rider. Applications: Grocery, Distribution and warehousing.

What is a Narrow Aisle Reach Truck?

A narrow aisle reach truck is a forklift that works in a narrow aisle and uses a pantograph to extend the forks out from the upright.  When extended, the forks are past the load wheels.  There is also a double reach trucks which has an additional segment in the pantograph which allows the forklift to pick and place loads two deep on pallet racking.

ORDER SELECTOR

An order selector is also called an “orderpicker”, “stockpicker” or a “cherrypicker” man up forklift truck.  This is because the operator actually rides up on the platform so that his feet are at the same height as the forks at any given time.  This machine is used in warehouses to “pick orders”.  In other words, the operator will go up to the level that the product desired is stored and physically pull the items desired and place them on a pallet or platform that is sitting on the forks.

Order pickers must always have a tether or lanyard attached on one end to the forklift and the other attached to a belt or harness on the operator.  This is to prevent the operator from falling to the ground from the operating height should the operator fall off the working platform. Notice that this type of forklift has outriggers (baselegs). Outriggers are the legs that are on the front of the forklift that have the smaller load wheels. Normally the load wheels are polyurethane as is the drive tire.  Application: Distribution and warehousing.  Order selectors are Class 3 forklifts.

Order Picker:

What is a Very Narrow Aisle Lift Truck?

First introduced by Raymond in North America.  The guided Swing Reach Turret style truck stores pallets in a “very narrow aisle” of as little as 66 inches.  This is dual purpose forklift for man up pallet retrieval as well as orderpicking (case picking).  These are considered Class 2 forklifts.

Crown Equipment produced a 3-wheel turret truck called the TSP6000 with a mono mast to compete with the Raymond in 2006.

PALLET JACKS

Electric pallet trucks come in several varieties.  There are stackers, rider pallet jacks and walkie pallet jacks.

Walkie jacks are electric and the operator walks behind the machine steering it through the handle. Walkies do not have as high a travel speed as a rider pallet jack. Rider pallet jacks have the option of the operator riding (standing) on the unit and traveling with it.  Both walkie and rider jacks lift from ground level to approximately 9 inches.

Walkie stackers have an upright and lift to greater heights than pallet jacks. Once again, the operator walks behind the unit and steers it via the handle.  Power workers are considered Class 1 equipment.

Application: Warehousing, distribution and manufacturing with relatively short runs (rider) or short runs (walkie).

Other types:

  • Walkie Pallet Jack
  • Rider Pallet Jack
  • Walkie Stacker
  • ELF Rider Pallet Jack

Pallet Jacks

What is a manual Pallet Jack?

The most basic piece of material handling equipment is the manual pallet jack.  It is used to pick up pallets of material and move it from one location to another.   Manual pallet jacks, by definition, do not have powered drive or lift.  Standard dimensions of the forks are 48” long and 27” wide but they can be ordered with custom specifications. This type of hydraulic manual hand pallet jack, was invented by the Raymond Corporation in 1934.

For the history of Raymond, click here: http://www.raymondcorp.com/history

Manual Pallet Jack History

Over 75 years ago, Raymond invented the industry’s first hydraulic hand truck.  This is the most basic of materials handling equipment.  To see the original pallet jack patent, click here.

http://www.raymondcorp.com/liftTruck.cfm?liftTruckID=57

More information:

http://en.wikipedia.org/

http://en.wikipedia.org/wiki/Pallet_jack


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Posted in Electric Forklift, Forklift, Glossary of Warehouse & Logistics Terms, Hyster, Lift truck, LP Forklift, Materials Handling, Narrow Aisle, Narrow Isle, Order picking, Orderpicker, Pallet Jack, Pallet truck, Propane Forklift, Reach truck, Swing Reach Truck, Training & Education, Turret truck, Very Narrow Aisle, Warehouse Basics, Warehouse Equipment | 7 Comments »


7 Responses to “Lift Trucks Explained – A Materials Handling Primer”

  1. By duaneh on Jul 11, 2011 | Reply

    very good industry primer.

  2. By danielblair on Mar 25, 2012 | Reply

    This is a comprehensive primer for proper understanding of material handling equipment. Great Job.

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