Caterpillar Fault Code

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735-6

Heavy Lift Locked / Noisy MCV

Variant 1

System

Hydraulic

Symptom

Heavy Lift Locked / Noisy MCV

Diagnosis & fix steps

LOGIC: Heavy Lift Solenoid Current Above Normal. ACTION: Check solenoid resistance (Target 30.8±2Ω). Inspect for pinched harness at the Rear Main Control Valve.

Red Seal field insights

Location: Mounted on the rear face of the Main Control Valve (MCV) bank. Voltage: 24V PWM.

Variant 2

System

Hydraulic

Symptom

Heavy Lift Solenoid: Current Above Normal

Diagnosis & fix steps

LOGIC: Over-current on the heavy lift circuit. ACTION: Check the solenoid resistance (typically 25–35 ohms).

Red Seal field insights

Often paired with E1239 on excavators equipped with the "Heavy Lift" software package.

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