Our NEW WATER CART HOIST CONTROL KIT was developed with several site elimination of live work team members who raised the requirement for a control system to allow the hoist cylinders on water carts to be raised and lowered, from outside of the footprint of the machines.
Original fault: When a water cart has been running the hoist control hydraulics through the water pump motor circuit for an extended period, the spool in the valve bank that controls the hoisting of the tank / tub becomes stuck in the float position and raising of the tank is impossible. The OEM chassis electronic controller cannot output the correct amount of current needed to dislodge the spool from its position and allow the tank to be moved.
Site solution: Connection of jumper wires from hoist valve coils direct to a power source. Usually, 24V from the jump-start point or a 18V supply from a cordless tool battery. This provides a higher amount of current to dislodge the spool, however this is an uncontrolled setup and could still potentially have the risk of maintainers working in or near the footprint of the machine to actuate the hoist coils.
Allplant solution: Hoist Raise/Lower controller. This kit comes with the hoist control box, a long valve bank control harness to connect to the hoist coils, and long power connection harness with a Cat Jump-start connection. These are designed to keep the maintainer well out of the machines footprint and able to be in the machine operator’s eyesight when connected or routed up to the cabin for the maintainer to operate the system directly from the safety of the cabin. The kit will connect to a 777, 785 or any Caterpillar machine with Deutsch connection hoist coils. The control box is clearly labelled and is conveniently sized for handheld operation, the box comes with a dual voltmeter with input voltage showing when the system is turned on, and output voltages displayed when the directional switch is operated. A dial potentiometer adjusts the system voltage to allow multiple uses for this system. Cat solenoids operate off a lower voltage – low current controlled PWM signal from the ECM, so we have set up our controller output to be adjustable from between 4VDC to 24VDC at a current limited to 5 amps, this allows a much higher current supply to the sticky hoist spools freeing them from their position and allowing normal hoist movement. There is also a twist lock latching “system stop” push button that will stop the controller operating in an emergency. The kit is housed in a rugged foam insert carry case and the harnesses are braided in high temp PVC coated nylon yarn.
Overview: Working with site electrical technicians to design a safe and simple to use kit for operation of water cart / dump-truck hoist controls.
Contact Allplant Auto Electric to find out more about Allplant’s new Water Truck hoist control kit.
