Oliver 4420 Owner's Manual page 14

When Planning:
1. DUST COLLECTION SYSTEM is required for this planer. Please make sure the system is on and provide
enough suction before operation begins.
2. KICKBACK happens when a workpiece is ejected, usually towards the infeed side of the planer, during
the operation. This can cause serious injuries or even death. This planner is equipped with metal anti-
kickback fingers to reduce the risk of kickback. Make sure they are clean and moving freely before
operation. Even with this safety device installed, kickback can still happen due to workpiece quality,
grain orientation and many factors. Operator should be cautious about possible kickback.

ALWAYS wear proper protection device and stay away from the line-of-fire to avoid kickback
related accidents.

NEVER look inside the planer during operation.

NEVER plane boards that are shorter than 6"as mentioned in the specifications.
3. PROPER WORKPIECE FEEDING avoids kickback. Never start the machine with the workpiece engaging
the cutterhead. Never start feeding until the planer has reached its full speed. Ensure there is proper
gripping force from the feeding rollers when passing through a workpiece.

NEVER force a workpiece through the planer. Make adjustments as needed.

ONLY plane one board at a time.

For twisted workpieces, use a jointer to face joint the bottom side of the workpiece before
planning.
4. STUCK WORKPIECE should be removed only after the planer is powered off, and the cutterhead
comes to a complete stop. Do not use hands or push sticks to force feed a workpiece through the
planer, as it can result in severe injuries and/or machine damage.
5. DEPTH OF CUT SETTINGS: Never exceed the designed maximum depth of cut capacity found in the
specification. Failing to comply can cause machine damage and injuries. Consider the hardness of the
workpiece when setting the depth of cut, as harder wood types increase the workload of the planer.
After Operation
1. STOP THE MACHINE if the operator leaves the machine for any reason.
2. WAIT until the machine comes to a complete stop.
3. CLEAN UP the work area before departure.
14 | Page Oliver Machinery 4420 Planer