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First, I'm not a Diahtsu mechanic.
* Check your warranty and call for service.
*** Following is for information only ***
* Truck Specs; http://www.daihatsu.co.za/media/delta.pdf
* PTO pump; https://www.youtube.com/watch?v=e-6Si20q1LU
* To find the Hydraulic system. Follow the lift piston (to the dump frame) hoses to the valve diverter. which is in the cab or on the side. There will be additional hoses that are connected to the pump. Most pumps are directly attached to the hydraulic oil tank. It may be mounted directly on top of the tank. The is to prevent the pump from running dry. If there is a remote tank then it should still be mounted very close (within 3 feet) as long hoses will reduce the power of the pump.
* Hydraulic systems; can be tricky. High pressures are used to lift heavy (Tons!) loads.
* Be safe. Call for service.
Since your dump bed is not a dealer installed option, it could be anything.....Do you know who installed the dump bed? From your post,....it sounds like you experienced a hydraulic fluid leak as motors don't have any fluid in them. You need to take it to someone who can check out the hydraulic system and troubleshoot the drive motor if it isn't working...also I would bet money that you hydraulic system is empty of fluid! Shops that work on large trucks (ie garbage, dump, or other trucks with wet systems...wet meaning hydraulic systems that do something on the truck) should be able to diagnose and fix your problem. good luck
no oil in reservoir
electronic control wires problem to valve body
failed seal on ram piston by passing oil
faulty over load pressure valve releasing at too low a pressure
pump not working --electric motor , motor contacts or if mechanical , no drive action on pump shaft NOTE-- SAFETY DENOTES THAT YOU PLACE A SUBSTANTIAL PROP UNDER A RAISED BODY AS IT DROPS AND ACTS LIKE SCISSORS ON ANY THING BETWEEN IT AND THE CHASSIS
A dual axle dump truck (ten wheels) is normally rated at 10 cubic yards (270 cubic feet) load capacity.
A single axle dump truck (six wheels) is normally rated at 5 cubic yards (135 cubic feet) load capacity.
These are volume measures not weight measures.
Its usually metal and is found between the Dump Bed and the Cab of the Truck. Sometimes it has a plastic grip on the end so you don't have to touch he metal and even better... Some Dumps today are really cool and you no longer need to get out of the truck to DUMP the load. Just make sure if you are trying to use the dump to drop a load that you un-hook the gate but you probably already know that.
Well, if you are not leaking fluid everywhere it can only be 2 things, either the cylinder is not holding pressure internally or the pump is not making enough pressure. I would start by getting the cylinder rebuilt, this is common and usually cheaper than having the pump rebuilt.