Heavy machinery
Brush chippers
The chipper is the highest-consequence machine on the truck. The panic bar test and feeding discipline are non-negotiable.
Safety features explained
Emergency feed-stop bar (panic bar)
A three-position bar across the infeed hopper: forward stops the feed rollers, center is neutral, pulled back reverses them. Tested every day, from all reachable positions.
Last-chance / bottom-stop cable
A cable inside the hopper that stops the rollers if a hand or body reaches it — the final layer, not a control.
Infeed hopper length and lower feed-roller guard
The hopper is built long enough that the operator's hands cannot reach the rollers when material is fed correctly.
Interlocked discharge chute & cutter housing latches
Keeps the housing closed while the drum or disc spins and keeps discharge under control.
Winch with remote clutch and load-rated line
Lets crews drag heavy wood to the hopper without standing in the bight or under the load.
Daily inspection checklist
- 1Walkaround pre-trip: tires and lug torque, lights, safety chains, coupler and jack, hitch pin, reflectors.
- 2Fluids: engine oil, coolant, hydraulic level and hose condition; check for leaks under the machine.
- 3Test the emergency feed-stop bar in all three positions, from both sides and the back of the hopper.
- 4Test the last-chance cable and any bottom stop bar.
- 5Check the infeed tray/hopper for cracks, bent edges and missing hardware; confirm the tray is fully extended and pinned.
- 6Inspect knives/blades for chips and sharpness, anvil clearance, bolts to torque spec, and bearing play — engine off, key out.
- 7Belts, clutch, guards, discharge chute deflector and cap all present and secured.
- 8Confirm the machine sits level and chocked, and that the chute is aimed away from traffic and people.
Out of service now
- Feed-stop bar or last-chance cable that does not stop the rollers — the machine is out of service immediately.
- Missing or bypassed guard, latch, or interlock.
- Hydraulic leak, frayed winch line, cracked hopper weld.
- Loose knife bolts, cracked knife or anvil, worn bearings.
- Any cutter-housing access while the drum/disc is turning.
Operating best practices
- Stand to the side of the infeed, never square in front of the hopper mouth, and never on the tray.
- Feed butt ends and small ends first per the machine's design, and let the rollers take the material — never push it in.
- Turn loose and walk away from long brush; never hold on as it feeds.
- No wrappers: keep vines, wire, rope, bull ropes, straps and tarps out of the chipper.
- Wear no loose clothing, no cuffed gloves, no dangling drawstrings; long hair tied.
- Keep hearing and eye protection on, plus a helmet and high-visibility apparel near traffic.
- Use the winch instead of a crew wrestling heavy wood; stand clear of the line's bight.
- Lockout/tagout, key out, and let the drum come to a complete stop before clearing a jam or touching a knife.
- Never leave a running chipper unattended, and keep the public and the crew out of the discharge arc.
Standards & compliance
- ANSI Z133: chipper infeed hoppers and emergency devices are inspected daily and operators are trained before use.
- ANSI Z133: no one reaches into the hopper past the infeed, and the chipper is attended whenever it is running.
- OSHA 1910.266(f) for chipper guarding and operation; OSHA 1910.147 lockout/tagout for any service.
- OSHA 1910.333 / DOT pre-trip requirements for towing to the job.
Summarised for field use. The current ANSI Z133 standard, OSHA rules and the manufacturer's manual are the controlling documents.
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panic bar and last-chance cable test
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daily chipper pre-trip inspection
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safe brush feeding and standing position
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lockout tagout before clearing a jam
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