Maintenance Mode

The detection value of elevating cylinder's cylinder side pressure detector is out of the normal range. Normal range: 5 to 95% (0.25 to 4.75 V)

Cause: Detector malfunction, signal line open circuit, board malfunction

Remedy: Perform inspection for the above possible cause.

Lever 1 neutral trouble

E2048

The input voltage of lever 1 is not consistent with the status of the neutral detection switch. (when the switch is at the neutral position) Or, lever 1 is not at the neutral position when the power is turned on, when the emergency operation is canceled, or when the lever stand recovers from the stowed state.

Cause: Joystick (JS) malfunction, wiring open/short circuit, board malfunction

*1: Only the series in which abnormality has been detected is stopped. (Other series can be operated.)

Telescoping operation trouble

The detection value of the boom length detector changes despite the fact that no output is provided to the proportional solenoid valve for telescoping control. (changes toward the extension side)

E2084

Cause: Contamination of hydraulic pressure system, solenoid short circuit, detector malfunction, board malfunction

*3: Venting is possible. Only the operation toward the opposite direction of the series in which abnormality has been detected is possible. Other series can be operated.

Boom section detection switch trouble

E2087

Multiple boom section detection switches are turned on simultaneously.

Cause: Wiring open/short circuit, detector malfunction, board malfunction

Boom section detection switch trouble

The telescoping cylinder length is not consistent with the status of the boom section detection switch.

E2089

Cause: Disorderly winding/adjustment failure/malfunction of the cylinder length detector Adjustment failure/malfunction of the boom section detector wiring open/short circuit, detector malfunction, board malfunction

B-pin detector trouble

Abnormality of the fixing pin between the booms. (pin cannot be inserted or removed)

The B-pin LOCK and UNLOCK detectors are both turned on.

E2090

Cause: Adjustment failure/malfunction of the B-pin detector Wiring open/short circuit, detector malfunction, board malfunction

C-pin detector trouble

Abnormality of the fixing pin between the boom and telescoping cylinder. (pin cannot be inserted or removed)

E2091

The C-pin LOCK and UNLOCK detectors are both turned on.

Cause: Adjustment failure/malfunction of the C-pin detector Wiring open/short circuit, detector malfunction, board malfunction

B-/C-pin trouble (combination abnormality)

E2092

The combination of the detected B-/C-pin status inputs is abnormal. A state in which both the B-pin and C-pin are removed is detected.

Cause: Adjustment failure or malfunction of the B-/C-pin detector Wiring open/short circuit, detector malfunction, board malfunction