Airstream PNEG-343 - Manual (Page 32)

32
SERVICE
HOW TO DETERMINE A METERING ROLL PROBLEM
To determine if the metering prob-
lem is from blockage, perform the
following test with the power off.
Remove the drive chain by loos-
ening the motor mounting bolts.
Refer to photo, and place a pipe
wrench on the hub of the roller chain
sprocket, on the left hand metering
roll at the drive end of the dryer.
Apply up to 100 ft. lbs. of force, and
attempt to rotate the roll toward the
inside of the dryer. If the metering
roll will turn, then repeat for right
hand side. If the metering roll will
turn, it can be assumed that no
blockage exists, and the problem is
from some other cause. Check for a
break in the power train, chain, drive
key, pin, etc.
CAUTION: Keep hands away from
sprocket teeth to avoid injury
from chain backlash, as a result
of torsion build up in the system
caused by the jam.
The auger discharge switch.
SERVICE TOOL
The metering roll drive.
HOW TO CLEAR A JAMMED METERING ROLL
This column cutoff damper is designed to insert through the grain column
(from the inside of the dryer) immediately above the metering roll. This
permits opening of the metering roll access door. For service or inspec-
tion without unloading the dryer, the plenum bottom closure panel and
metering roll adjust damper must be removed prior to using service tool.
Place a pipe wrench on the hub of
the sprocket of the jammed meter-
ing roll and turn the roll. First, back-
ward, and then, forward several times
in an attempt to dislodge the object,
and clear it through the roll. If this is
not successful, have an assistant
turn the metering roll, and attempt to
locate the jam by sound. Shut down
the fan/heater, and eliminate any other
noise when making this check. Once
the location is determined, the roll can
be reached from the outside by open-
ing the access door to remove the for-
eign object causing the jam (before
opening doors see below). The ser-
vice tool must be inserted before open-
ing doors. First, swing open the ple-
num bottom closure panel. Insert the
service tool above the metering roll.