Differences in Daily Maintenance Points Between 3-Wheel and 4-Wheel Electric Forklifts
Most electric forklifts spend the majority of their working life moving, stopping, turning, and lifting loads. As such, a quick inspection before a shift can catch problems before they become downtime or a safety concern.
Basic inspection is similar whether the truck has three wheels or four. There are however certain additional considerations specific to 3- and 4-wheel forklifts.
On a 3-wheel truck, the rear steering assembly is a key area, whereas in a 4-wheel forklift, the inspection of all four tires, front axle, chassis, and brakes, deserves special attention.
Overview of inspection checks
Below is a brief overview of the pre-shift inspection check powered trucks must go through:
- forks and retaining components
- mast, lift chains, and rollers
- hydraulic cylinders, hoses, and fluid
- tires and wheels
- battery, cables, connectors, and restraints
- steering and brakes
- horn, lights, and other safety equipment
OSHA rules demand that powered industrial trucks be examined at least daily before being placed into service. If they are being used around the clock, they should be examined after each shift. The manufacturer's instructions should be used alongside the daily inspection routine. Service intervals and specific inspection requirements vary between forklift models.
Inspection checks specific to 3-wheel forklifts
Rear steering wheel
The rear steering wheel should move smoothly and respond without a noticeable delay. Look closely for any embedded objects, or loose wheel assembly. A little extra attention here is worthwhile because the single rear wheel has an important role in both steering and traction.
Steering mechanism and surrounding area
When a 3-wheel forklift makes a tight turn, the rear steering assembly swings through a very large angle. It is important, therefore, that there are no loose parts or debris that could affect this movement.
Another useful check to inspect the steering mechanism is to notice the feel of the forklift when you are driving it. If turning is jerky or excessive, don’t dismiss as that might signal that the steering assembly may need attention.
Inspection checks specific to 4-wheel forklifts
Tires
All four tires, not just the steering wheel, require equal attention. Inspect them for any cracks, cuts or heavy wear. Noticeable differences in tire conditions can reduce stability and affect handling, especially while the forklift is carrying heavy loads.
Front axle and steering
The front axle and steering linkage should not have obvious damage, looseness, or unusual movement. When the steering is tested, it should respond normally and without hesitation.
Brake performance
Becomes particularly important when the truck is carrying heavy loads. Make sure the brakes are not making any unusual noise, and that the braking distance is within safe limits.
Truck underside
Look underneath and around the truck for dirt, debris and oil or other fluids that were not there during the previous inspection. OSHA requires industrial trucks to be kept clean and free of excess oil and grease.
Miscellaneous inspection checks
Battery inspection
For battery checks, the correct procedure depends on the battery type.
If the forklift is powered by a lead-acid battery, inspect the condition of the battery, cables, connectors, and restraints. Make sure the electrolyte levels match those provided in the operating manual.
Lithium-ion batteries have different maintenance requirements. Generally speaking, deep discharges and very hot operating environments can reduce their long-term charge capacity. Keep a close eye on the battery discharge indicator. OSHA recommends returning an electric truck to the charging area when the gauge indicates a low charge.
For more instructions, refer to the user manual provided with the fork lift.
Forks, mast, and hydraulics
OSHA's inspection guidance includes forks, tires, hydraulic hoses, mast chains, and hydraulic fluid. Before operation, watch for visible damage to or leakage in any of these components. At no point in the inspection should you put your hands in the mast assembly. During operation, report any unexpected vibration, noise or changes in lifting behavior.
Tips to make inspection routine practical
- The checklist should be detailed enough to cover the important components but not so much that operators rush through it.
- Keep the checklist with the truck or in an obvious location. Operators should not have to hunt for the form before every shift.
- Don't mix the previous day’s inspection into today's shift. A forklift can develop a problem after the previous inspection, especially in a multi-shift operation.
- Report changes instead of waiting for a failure. A truck that suddenly sounds, stops, turns or lifts differently is giving the operator useful information.
- Use the manufacturer's maintenance schedule. The daily check is only one part of forklift maintenance.
Frequently Asked Questions
What should be checked daily on an electric forklift?
Forks, mast, lift chains, hydraulic system, tires, battery, electrical connections, steering, brakes, horn, and lights.
What should I check first on a 3-wheel electric forklift?
Before operation: Check the rear tire and wheel for damage or looseness, then make sure the steering responds smoothly
During operation: Be on the lookout for unusual turning, braking or reversing behavior
What needs extra attention on a 4-wheel electric forklift?
Tire condition and brake performance, especially when the forklift is carrying heavier loads
Do 3-wheel forklifts require more maintenance?
Not really. Both configurations require regular inspections and preventive maintenance
How often should an electric forklift be inspected?
At least once a day (OSHA). Continuously operated trucks should be examined after each shift.
Final thoughts
In this article, we took a detailed look at similarities and differences between the daily maintenance points of 3- and 4-wheel electric forklifts. Their unique constructions mean there are certain checks specific to each kind.
Regardless of what forklift you intend to use in your warehouse, choosing the right equipment supplier can reduce maintenance hassle and costs maximize productivity. With more than 20 years of experience building heavy duty machinery including forklifts, Meenyon has established itself as a name of reliability. Below are some of our bestselling forklifts. If you have any questions, feel free to reach out. We’d love to hear from you and recommend the right forklift solution to meet your specific business needs.
