Breather Valve
Located in the drum support on planetary hoists, the vent plug— also referred to as a breather valve or internal check valve— allows trapped gases inside the hoist to escape and should be inspected daily.
If there is visible damage or the vent plug does not appear to be working properly, replace the entire part. If oil is seen dripping from the vent plug, take the hoist out of service immediately and investigate the root cause.
Never paint over the vent plug or replace it with a grease fitting as this could cause air to be trapped in the drum, potentially causing drum seal leaks.
The Once Over
The daily inspection should also include visually looking at the hoist in its entirety for corroded, loose or missing bolts, pins or other fasteners, which should be tightened, repaired or replaced as necessary.
Check the hoist and drum, rotation indicator transmitters, anti-two-blocking
Optional sight glass for an easy visual check to ensure oil level is properly maintained.
Critical brake system components such as friction discs are inspected and often replaced.
Proper installation and periodic testing of the sprag clutch prevent May unintended 2025 • www lowering. thepartsconnection of loads.. org • 11