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BARK BLOWER ADJUSTMENTS (CONTINUED)
B. EXCESSIVE AUTO-REVERSING
If the rotary air valve starts to auto-reverse more than three times per minute, that means the
rotary air valve is being overfed and the floor speed should be turned down or the knife is dull
and should be resharpened or replaced and / or the quality of the mulch is poor. Excessive auto-
reversing leads to less production rather than if the floor was just turned down to a slower speed
or the knives were sharpened. This condition will occur more often with green, stringy mulch or
less-processed material that contains larger chunks of wood that the rotary air valve may have to
cut.
C. REGULARLY TRIPPING THE BLOWER RELIEF
The blower on your machine has a relief valve in the air line circuit to protect the blower against
a large back pressure that could build if the line becomes plugged. The relief valve, set for
10 psi (69 kPa), is located directly behind the blower in the engine area of the machine. A
blockage, temporary or otherwise, can trip the relief valve, which causes a loud whining noise
emanating from the engine area. Occasional blow off through the relief valve is expected, as long
as the machine can clear itself. However, if the relief valve goes off repeatedly in a 10-second
time span, then the rotary air valve or hose is in danger of becoming completely blocked. The
floor speed should be immediately reduced until the relief valve is not heard consistently going
off. Partial plugging most often occurs with less-processed material or if the mulch is wet and
dense.
CLEARING A BLOCKAGE
If the unit does become plugged and the machine cannot clear itself, quickly shut off the material
feed, decrease the engine RPM to low idle, and then shut off the engine.
NOTE: If the blockage is in the rotary air valve and not in the discharge hose,
immediately use the EMERGENCY STOP (E-Stop) button.
To clear the blockage, perform the following steps:
1. Disconnect the discharge hose and determine if the blockage is in the rotary air valve
discharge. Any blockage should be seen through the discharge outlet. If there is no
blockage, then the hose is plugged somewhere.
2. If there is blockage in the rotary air valve, loosen and remove the discharge outlet.
3. Remove any blockage and clean the discharge of any mulch debris, especially on the
gasket surface, so that it can seal tightly.
4. Re-install the discharge outlet.
5. Reconnect the discharge hose if it is not plugged.
6. Restart the machine with the floor off, then run the engine to full RPM to clear out the
rotary air valve and any mulch lying in the hose.
7. Resume normal operation.
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