It is the electric motor that drives the indoor truck. Forklift trucks use large lead-acid batteries and a motor is required to charge the batteries. It has a fixed lifespan and the battery must be replaced after a certain period of time. Since it is an expensive device, forklift owners buy komatsu rebuilt parts that function like new parts.
Overhauled electric motors are a by-product and therefore inexpensive. But price isn't the only reason machine parts are so popular. Quality is before price. Aftermarket products are as good as branded parts and cheap too. With spare parts, you get high quality equipment at an affordable price. What makes the offer even more attractive is the exchange guarantee that comes with the product.
A tired engine won't help because it can't generate enough electricity to charge the lead-acid battery that powers the truck. It is the battery that drives the truck indoors to move bulk cargo from one location to another.
If the battery is not charged properly, the truck will not get the energy it needs to move the load. On the other hand, an undercharged battery will unnecessarily overload other critical truck components.
Using a forklift that is not capable of handling bulk cargo can be detrimental to your business interests. The use of such a machine will not only harm the weight but also the operator. If the truck needs a new motor, new parts must be provided, otherwise you will have to replace the lead battery.