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Under-lubricated circle rack gear and worn circle shoes caused uneven blade rotation, requiring excessive hydraulic pressure and producing circle stalls under load
Worn traction-motor brushes and a pitted commutator reduced the drive motor’s effective torque, producing slow acceleration and reduced grade-climbing ability under load
A failed boom chain tensioner spring and elongated chains caused the third-stage telescope to extend out of sync with the second stage, producing jerky boom lift and inconsistent load height
A worn turret rotation worm gearbox and a failing rotation drive motor’s brake released intermittently, producing incomplete turret rotation and intermittent rotation lock-up during pallet placement
A failed mast tilt cylinder’s rod-end seal and a worn tilt cylinder piston allowed internal bypass, producing forward mast drift under load and loss of back-tilt holding force
A worn swing bearing’s internal raceway and damaged swing reducer’s output pinion caused metal-to-metal grinding, upper-structure sway, and intermittent slewing lock-up
A failed hydraulic pilot pump and clogged pilot filter reduced pilot circuit pressure, causing sluggish main control valve spool shifts and weak auxiliary attachment flow
Worn telescopic boom wear pads and a damaged extension wire rope caused metal-to-metal contact between boom sections, producing jerky extension and a rhythmic grinding noise
A failed final drive motor’s output shaft seal allowed gear oil to leak out and hydraulic oil to enter, degrading the travel motor’s efficiency and producing right-side travel power loss
A worn parking brake’s friction discs and a corroded parking-brake actuator’s electrical connector caused progressive loss of holding force, producing ramp rollback and warning activation
