Lift Function Cutout Active

Common Symptoms

• Platform LCD on the upper control box displays code 32 and lift stops responding
• Lift up function is dead at the platform controls but drive may still work
• Machine beeps or alarm sounds when operator attempts to raise the platform
• Tilt indicator or overload light may be illuminated on the upper control box
• Platform will lower but will not raise from either ground or platform controls
• READY light may remain on but lift function is blocked completely
• No hydraulic movement heard when lift button is pressed

Probable Causes (Ranked by Likelihood)

• Tilt sensor or tilt switch triggered, machine is on uneven ground beyond allowable slope limit Very Likely
• Overload condition detected, platform load exceeds rated capacity or load sensor is faulty Very Likely
• Upper limit switch activated or damaged, scissor stack has reached maximum height and switch is stuck closed or wiring is shorted Likely
• Lift cutout relay or lift enable circuit has failed or lost signal from the GCON or TCON Likely
• Broken, corroded, or disconnected wiring harness to the tilt sensor, load sensor, or limit switches Possible
• Hydraulic pressure switch faulty, sending a false cutout signal to the controller Possible
• Software fault or corrupted calibration data in the RDC2 or Guardian controller requiring reset via EZcal / Pcal handheld Less Likely

Step-by-Step Diagnostic Procedure

1. Step 1: Before anything else, fully lower the platform to ground level and check that all four wheels are on firm, level ground. A tilt of more than 1.5 degrees in any direction will trigger a lift cutout on most SJIII and SJ-RT models. Move the machine to level ground and try the lift function again.

2. Step 2: Inspect the platform for overloading. Remove all personnel and equipment from the platform, then attempt to lift with the platform empty. If lift restores, the load sensor is working correctly and you had an overload condition. Recheck the rated capacity for your specific model.

3. Step 3: Visually inspect the tilt sensor, usually mounted on the chassis frame near the center. Look for damage, loose mounting bolts, or disconnected wiring. With a multimeter set to DC voltage, check that the sensor is receiving supply voltage (typically 5V or 12V DC depending on model). A missing or erratic signal here will lock out lift.

4. Step 4: Locate the upper limit switch on the scissor arm or at the top of the scissor stack travel. Inspect the switch body and actuator arm for physical damage or misalignment. With the platform fully lowered, measure continuity across the switch with a multimeter. It should show continuity (closed circuit) in the lowered position. No continuity when lowered means a failed switch.

5. Step 5: Trace the wiring harness from the limit switches and tilt sensor back to the lower control box. Look for chafed insulation, crushed sections of harness (common at the scissor pivot points), corroded connector pins, or broken wires. Wiggle the harness while watching the Platform LCD for code changes, which can help isolate an intermittent break.

6. Step 6: At the lower control box, check the lift cutout relay if accessible. Swap with an identical spare relay if available. Verify the relay coil is energizing by measuring voltage across the coil terminals when the lift button is pressed. You should see 12V DC or 24V DC (check your model wiring diagram) when the circuit is calling for lift.

7. Step 7: If all sensors, switches, and wiring check out, connect the EZcal / Pcal handheld to the diagnostic port and read active fault codes. The EZcal / Pcal will show raw sensor values for tilt and load so you can confirm whether the controller is reading a false signal. Use the EZcal / Pcal to perform a calibration reset if the controller has a stored fault that has not cleared after the underlying issue was corrected.

8. Step 8: If code 32 persists after all the above steps and sensor readings look normal on the EZcal / Pcal, the fault is likely inside the RDC2 or Guardian controller itself. At that point you need a Skyjack-trained technician with factory diagnostic software to reprogram or replace the controller.

Frequently Asked Questions