Maintenance Section
92
Inspection, Maintenance and Repair of Lift Truck Forks
The following section gives practical guidelines for
inspection, maintenance and repair of lift truck forks.
It also provides general information on the design
and application of forks and the common cause of
fork failures.
Lift truck forks can be dangerously weakened by
improper repair or modification. They can also be
damaged by the cumulative effects of age, abrasion,
corrosion, overloading and misuse.
A fork failure during use can cause damage to the
equipment and the load. A fork failure can also
cause serious injury.
A good fork inspection and maintenance program
along with the proper application can be very
effective in preventing sudden failures on the job.
Repairs and modifications should be done only by
the fork manufacturer or a qualified technician who
knows the material used and the required welding
and heat treatment process.
Users should evaluate the economics of returning
the forks to the manufacturer for repairs or
purchasing new forks. This will vary depending on
many factors including the size and type of fork.
Forks should be properly sized to the weight and
length of the loads, and to the size of the machine
on which they are used. The general practice is to
use a fork size such that the combined rated
capacity of the number of forks used is equal to or
greater than the “Standard(or rated) Capacity” of
the lift truck.
The individual load rating, in most cases, will be
stamped on the fork in a readily visible area. This is
generally on the top or side of the fork shank.
•
A fork rated at 1500 pounds at 24 inch load
center will be stamped 1500B24.
•
A fork rated at 2000 kg at 600 mm load center
will be stamped 2000B600.
The manufacturer identification and year and date
of manufacture is also usually shown.
Some countries have standards or regulations which
apply specifically to the inspection and repair of forks.
Users may also refer to the International
Organization For Standardization - ISO Technical
Report 5057 - Inspection and Repair of Fork Arms
and ISO Standard 2330 - Fork Arms-Technical
Characteristics and Testing.
While there are no specific standards or
regulations in the United States, users should be
familiar with the requirements for inspection and
maintenance of lift trucks as provided by the 29
Code Federal Register 1910.178 Powerd Industrial
Truck, and ANSI/ASME Safety Standard(s) B56.1,
B56.5 or B56.6 as applicable to the type of
machine(s) in use.
Environment Protection Section
When servicing this lift truck, use an authorized
servicing area and an approved container to collect
coolant, oil, fuel, grease, electrolyte and any other
potential environmental pollutant before any lines,
fittings or related items are disconnected or
removed.
After servicing, dispose of those materials in an
authorized place and container. When cleaning the
lift truck, be sure to use an authorized area.
