Tech Tips

The new Deutz 2.9L tier 4 engines utilize a common rail fuel injection system. Gone are the familiar lift pump and injector pump arrangement. These engines use an electric fuel pump to deliver fuel through the filter to the high pressure fuel pump. The pump is mounted near the fuel tank near the replaceable cartridge fuel filter.

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All the latest Skyjack boomlift models utilize a function control module called the OCM – On-board Control Module, or the newer version; the SCM – Skyjack Control Module which are located in the platform control console. The OCM/SCM has a two line LCD display and a membrane keypad that allows the technician to access the programming without the need for a separate plug-in calibrator. Once the programming is accessed, the technician can monitor function status and make adjustments to function speeds similar to adjusting the trim potentiometers on a joystick circuit card.

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When working with the A.C. power cords for the power to platform and the battery charger replacement cords, the wire colors for U.S./CA (North America) power cords may differ from U.K./Australia wire colors. The U.S./CA follow the NEC standardized colors. The U.K./Australia wiring uses the IEC standardized colors. The table below shows the corresponding colors for the NEC and IEC wire identification.

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The Skyjack SJ12 and SJ16 model vertical mast lifts share many characteristics of the SJIII Compact and Conventional scissor lifts. One feature is the ability to remove the platform control box from the machine. This allows the operator to prevent unauthorized use of the machine or allows a technician to swap in a different control box if the control box becomes damaged or for troubleshooting. The connector contacts use a male and female pin and socket arrangement.

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It is recommended that all aerial work platforms be inspected prior to being sold, leased, or rented. Completing the Pre-delivery Inspection, or PDI ensures that the machine has been tested and inspected for proper and safe operation prior to being put into service, and that the unit has no worn or missing parts and is not damaged. Skyjack furnishes forms to assist in the completion the PDI inspection.

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The joystick controllers used on the Skyjack telescoping (40/45 T & 61/66 T) and the articulating (46/51 AJ & 63 AJ) boom lift models all operate similarly. Whether it is a single or dual function joystick, testing and troubleshooting steps are the same. When the joystick is powered, it shows a neutral signal to the On-board Control Module or OCM. This neutral signal is between 4.2 and 4.8 volts. As the joystick is moved in any direction, this signal changes by either rising toward 8.5 volts maximum, or dropping to .5 volts minimum.

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When troubleshooting Skyjack electric scissor lifts, it is useful to be aware of two manually operated valves that can cause operation issues and which may be overlooked. These should be the first items checked when experiencing the symptoms described below. Symptom: The platform lifts slowly and seems to have a heavy load on the platform. The pump motor strains as if the batteries are low on charge. First thing to check: Take a look at the lift cylinder holding valves. These are the valves that are opened when using the emergency platform lowering....

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Diodes are used extensively in the electrical circuits of every Skyjack aerial work platform and telehandler. We use them primarily to separate common circuits from each other. For example, the SJIII electric powered scissor lifts use diodes to allow multiple circuits to power the pump motor solenoid but each separate function valve will remain unpowered; only the specific function valve that is asked for will be powered. The diode acts like an electrical check valve allowing power to flow through it in one direction only.

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The 4-way valves used on skyjack equipment use a simple coil operated sliding spool design to direct oil to the correct function. (See figure 1) When one of the coils is energized, the spool shifts position opening one port to the function and the opposite port to the return to tank. The flow of oil to the correct port only occurs when the spool slides to either side. In some instances of a function failure, the valve coil may have power and ground signals at the correct electrical coil terminals but no function operation. In order to test that the spool is not stuck, we can use the manual override built into the valve.

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The Skyjack full-size rough terrain scissor lift models 8831/8841 and 9250 offer single or dual hydraulic extension decks as an option. These optional hydraulically powered decks extend and retract using a cylinder and hydraulic power pack mounted under the platform and operated from a small control box located on the main platform. When the key/selector switch on the main control box is positioned in the LIFT mode, the power extend deck circuit is enabled, allowing power extension deck operation.

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