Hydraulic maintenance, Bleeding marker hydraulics, Drive-line shear pin – Great Plains YP825A3P Operator Manual User Manual
Great Plains Manufacturing, Inc.
As with any hydraulic system, contamination is the most
common cause of performance problems and
pre-mature wear. Make a special effort to properly clean
quick couplers prior to attaching the hoses to tractor, and
never let them fall to the ground.
Bleeding Marker Hydraulics
To fold properly, the marker hydraulics must be free of
air. If the markers fold in jerky, uneven motions.
As the marker cylinders are encased within the main tool
bar, it is not practical to bleed them at cylinder fittings.
Remove air from the system by slowly cycling fold and
unfold several times.
Drive-Line Shear Pin
Refer to Figure 87
The spirol pin
that connects main transfer shaft
to the transmission shears if an excessive load
is put on the shaft.
Infrequent or improper lubrication causes binding of
moving parts within the planter. This binding can cause
the spirol pin to shear, preventing more serious damage
to other planter parts.
Machine Damage / Nuisance Shear Risks:
Do not use arbitrary spirol pins. Replace sheared pins with
cotter pins of the same size. Strong pins may fail to shear,
causing more serious damage elsewhere. Weaker pins are
prone to nuisance shears. Refer to current Parts Manual for
correct spirol pin replacement part number.
Transmission Shear Pin