| Why
does the engine shutoff when I let go of the
Murphy (shutoff) switch? |
| Most
of ODB’s leaf collector engines are
equipped with a Murphy (shutdown) switch that
shuts the engine off when an event happens.
On typical units there are 3 events that shut
the engine off. 1- low oil pressure, 2- high
engine temperature, 3- limit switch on the
blower housing inspection door is tripped.
When the engine first starts, the engine has
little or no oil pressure, so the shut off
button needs to be depressed to bypass the
shut off mechanisms. Then after 5 seconds,
the shut off button can be released and the
engine should continue to run. If the engine
does not continue to run, then a technician
should investigate one of the three events
above to determine which one is shutting the
engine down. |
 |
| When
installing a new impeller how far away should
the impeller back be from the rear of the
blower housing? |
| As
long as the impeller back clears the bolt
heads of the blower housing then it is okay.
Make sure the impeller and the impeller bushing
meet. The bushing should be flush with the
impeller shaft. |
|
| I
can’t get my old impeller off. I used
the bolts that came with the bushing to drive
the bushing out but it didn’t work.
Is there a trick to getting the bushing off
of the shaft? |
| See
your service manual for complete details but
here it is in a nutshell. Spray the bushing
with a lubricant, then drill and tap 2 more
holes in the lip of the bushing. Use 2”
long grade 8 bolts in all four holes and it
should drive right out. |
|
| One
of the blades of my impeller has broken, can
I weld it back and re-use the impeller? |
| No!
Let me say it another way. NO! Never try to
fix or modify the impeller. If the impeller
becomes damaged, vibrates or is worn replace
it immediately. |
|
| The
unit is vibrating like crazy, but only when
I put the PTO in gear, what’s the problem? |
| Most
likely the impeller is out of balance and
this can cause tremendous damage to the entire
unit. The impeller needs to be replaced. Even
if the impeller looks like it is worn evenly
it can still be out of balance a little bit,
and when the impeller is turning at 2,200
rpm a little out of balance can cause major
problems. |
|
