Steps to address insufficient braking force in a hoist brake

Wear or oil contamination of brake linings: Replace if the remaining thickness is less than one-third of the original thickness or if rivets are exposed; clean the brake wheel or brake lining if oily

Main spring fatigue/breakage: Replace the spring if the free length is out of tolerance or noticeably weak.

Hinge point jamming: Clean and lubricate all pins and levers to remove rust and eliminate binding.

Hydraulic actuator malfunction: insufficient oil, air in the system, oil leakage, or impeller jamming-requires adding hydraulic oil, purging air, or repairing the actuator.

Method: Loosen the lock nut, then turn the nut clockwise to increase spring compression and thereby increase braking torque.

Adjust the torque scale on the brake nameplate to the specified value (usually the rated braking torque), then tighten the lock nut securely.

Do not over-tighten beyond the maximum limit, otherwise it will be difficult to release the brake and the brake lining may overheat due to friction.

In the released position, the uniform gap between the two brake shoes and the brake wheel should generally be 0.5–1 mm (refer to the nameplate; for smaller wheels, 0.3–0.5 mm is acceptable).

Adjust the clearance bolts to ensure equal gaps on both sides, preventing uneven dragging or poor contact.

Adjust the clearance or reset the automatic compensation device promptly after pad wear to prevent loss of braking force due to zero compensation travel.

Power on and observe that the opening and closing speeds of both brake arms are consistent; if unsynchronized, fine-tune the single-side rod.

The contact area between the lining and the brake wheel during closing shall be ≥70%~80%.

No-load jogging test: Immediate brake engagement upon power loss, no coasting or hook drift; no abnormal heating or unusual noise.