5
Parker Hannifin
Pump and Motor Division
Trollhättan, Sweden
Hydraulic Saw Motors
Series F11iP
Bulletin HY30-8251/UK
Application Guide
Functional_schematic_return.ai
Leif A./07-05-10
A
B
F
E
D
1
2
4
C
3
Functional_schematic_cut.ai
Leif A./07-05-10
D
F
E
A
C
B
1
4
3
2
Cutting mode
(refer to the top schematic)
The machine operator activates the start/stop function
'4' which starts the saw motor. When the motor reaches
operating speed, the cylinder piston side (port 'E') is
drained and the cutting bar starts to move 'down'.
The drain flow (through port 'E' and valve '2'), provides
cooling to the motor case.
Chain saw function
Return mode
(refer to the bottom schematic)
When the tree or log has been cut through, the
operator de-activates the start/stop solenoid valve '4'.
Valve spools '2' and '3' move to the 'up' position and the
motor stops turning.
At the same time both sides of the cylinder are pressu-
rized and the cutting bar moves 'up' to the start position
(because of the re-generative cylinder/valve hook-up).
Chain saw function - return mode.
- The connected spool valve functions, '2' and '3', control
the speed of the motor as well as the saw bar speed.
NOTE:
- The pressure compensated pump is operating
during the entire cutting cycle.
- The pressure reducing valve, '1', reduces the
pressure to the saw bar cylinder.
Chain saw function - cutting mode.
