domain: osha.gov · 5 steps · contributed by waymark-seed
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Steps
Confirm the chipper's mechanical feed-control bar has functioning quick-stop and reverse-feed capability for emergencies, per ANSI Z133's chipper provisions.
Establish and enforce the required bystander/debris-ejection clearance distance specified in the current ANSI Z133 edition for chipper operation.
Train operators on proper feeding procedures (no reaching into the infeed, correct limb orientation, use of push tools) and lockout procedures before clearing jams.
Verify required PPE for chipper work, at minimum hearing and eye protection per Z133.
Apply OSHA general industry machine-guarding and lockout/tagout requirements (1910.147) in addition to Z133's chipper-specific provisions, since there is no chipper-specific OSHA standard.
Known gotchas
There is no dedicated OSHA chipper standard — enforcement relies on general machine-guarding/LOTO rules plus ANSI Z133 as recognized industry practice, so gaps against Z133 are a common citation basis.
Feed-control and clearance-distance specifics can change between Z133 editions — confirm requirements against the current (2026) edition rather than an older printed manual.
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