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Parker Hannifin
Pump and Motor Division
Trollhättan, Sweden
Hydraulic Saw Motors
Series F11iP
Bulletin HY30-8251/UK
Application Guide
Parker Hannifin holds a leading position when it comes
to product and application knowledge, dedicated to
serve the forestry machine market.
We offer hydraulic components such as pumps, cylin-
ders, motors, directional control valves and remote
controls, as well as electronic equipment, suitable for
most
forestry machines.
Introduction
Parker Hannifin offers an extensive range of compo-
nents suitable for forestry machines and will assist with
an optimal technical solution to obtain the most cost-
efficient system.
Based on many years of experience from forestry appli-
cations, product development at Parker Hannifin has
always been focused on helping manufacturers obtain
the best possible performance from their machines.
Many of our products are developed in direct and close
co-operation with our customers.
The optimal saw motor
Series F11 motors have proven extremely reliable in
demanding applications such as chain saw drives.
Primarily due to the 40 degree bent-axis design,
spherical pistons (with laminated piston rings) and gear
timing, extremely high speeds can be permitted, and
the reliability is not affected even at low-temperature
start-ups.
Based on the well proven F11 design, the saw bar
can be mounted directly on the motor housing, and
the chain sprocket can be installs on the motor shaft
without the need for additional bearings
The saw motor unit has integrated functions for start/
stop and speed control, which means long motor life.
The saw motor also controls the saw bar feed function,
which provides optimal chain speed and saw perform-
ance during the entire cutting process.
To further enhance the saw function and, at the same
time, reduce weight, cost and installation dimensions,
Parker Hannifin has thus developed a motor unit which
is specifically dedicated to chain saws.
Benefits
• Simple installation means lower cost
• Low overall weight
• Compact installation
• Reduced motor shaft loading
• Improved performance
• Controlled cutting process.
Saw motor requirements and recommendations
In order to obtain the most satisfactory function of
the saw motor, the hydraulic system of the machine
must be able to maintain a system pressure through
the whole cut of at least 220 bar at the motor; higher
pressure levels (up to max allowed for the motor) will, of
course, increase the performance even further.
Through the whole cut the corresponding flow into the
unit should, at least, be:
- 180 l/min @ 8 500 rpm and 14-tooth chain sprocket
- 195 l/min @ 9 200 rpm and 13-tooth chain sprocket
- 210 l/min @ 9 900 rpm and 12-tooth chain sprocket.
As a consequence, the pump must be able to deliver
at least a 5% higher flow than what is shown above to
properly secure the saw function.
In order to utilize the full potential of the saw motor,
it is most important to minimize pressure losses in the
hydraulic system as much as possible. Avoid using so
called 'banjo' couplings and make sure there are no
sharp bends in the utilized hydraulic hoses, couplings
and hydraulic piping.
The saw motor unit has a motor flushing function
which is integrated with the sword feed function. By
connecting the drain port "D" directly to tank, additional
flushing will usually not be required.
As the saw bar feed function is of a re-generative type
(refer to the saw function on page 5) a 40/30 or 40/25
mm feed cylinder is recommended; this will ensure the
best cutting performance of the saw.
If another cylinder configuration is being considered,
please contact Parker Hannifin.
The electric signal to the 'start/stop' solenoid which
starts the cutting cycle must be of the 'no ramp' type, so
that the saw motor can start immediately without delay;
otherwise, there may be a risk of motor break-down.
NOTE:
The chain saw function is covered on page 5.
!
Varning.ai
Leif A./07-03-09
WARNING
The saw motor must not, under any circumstances,
operate without load for more than 5 seconds;
there is otherwise a risk of motor break-down!
!
Varning.ai
Leif A./07-03-09
