Keypad Status Lights
Jack down Status LED’s will not go out –or- Jack down LED’s go out and pump
quits prior to jacks being fully retracted
There is a “Jack down status light” near each set of manual up and down arrows that indicate
(when illuminated) that the jack(s) are not fully stowed. This issue is created by a problem with
the pressure switch circuit. This could be a defective pressure switch, an issue with the
controller, or the yellow/black wire from the controller to the pressure switch could be shorted to
ground. To test for this- remove the yellow/black wire from the pressure switch -and using a
digital volt meter, measure for voltage at the yellow/black wire with the control panel turned on.
There should be close to battery voltage (12VDC +). If there is no voltage either the controller is
defective or the yellow/black wire is shorted to ground- or it is open. To further verify this, press
the all retract button (with the yellow/black wire disconnected and protected from contact with a
ground source). The jack status lights should go out within a few seconds after the pump comes
on. If the Jacks Down LEDs do not go out, then you have confirmed that the issue is with the
controller or the yellow/black wire is shorted to ground. To check the pressure switch, check for
continuity across the pressure switch terminals with the yellow/black wire disconnected. If the
jacks are extended, you should have continuity (switch is closed). Push the all retract switch on
the keypad and the pressure switch should go open (no continuity) shortly after all of the jacks
have reached full retraction. If the switch stays closed, then the pressure switch is defective -or
the pump can not develop enough retract pressure to trip the switch (this is a rare possibility).
Jack Down status lights come on during travel (see troubleshooting guide)
Generally this is caused by a loss of fluid pressure in the retract side of the hydraulic circuit. Its
most likely cause is an external fluid leak at a hose/fitting connection at a jack leg or slide
cylinder. Other than this, its cause may be a defective jack leg or slide cylinder. The retract
pressure hold check or valve at the pump may also be a cause. Usually this is not an issue with
the keypad, controller or the pressure switch -as they are reporting a possible fault in the retract
side of the hydraulic circuit.
Operating light
When Auto-Level or All Retract is pressed, the operating light should come on with a steady
pulse (blink) and accompanying beep can be heard from the control panel. It will stop when the
process is complete or a fault has occoured. If there is a fault, other lights will most likely come
on as an aid in defining what the issue was.
Low Voltage
This light will come on if the voltage to the controller falls below approximately 10.5 VDC. It
will stay on until cleared by a press of any button on the control panel. When this light comes on
the pump may shut off as the voltage to the unit has fallen below proper operational limits. The
main cause of this is generally weak batteries or poor connections. Check connections: From
the battery to the pump (on the positive connection), the battery ground to frame, or the pump
ground side.
