SECTION I
GENERAL INFORMATION
Pilot piston forces open check valve (A) on base of
cylinder, allowing oil to flow from base of cylinder, thru
valve spool, and into oil return line.
Seat Functions
If
SEAT UP
button on hand control is selected (in
normal table orientation), motor pump is energized and
valve spool for that function moves to an up function
position (oil will now flow in new oil flow path that has
been created; this path is shown by straight flow
symbols on hydraulic schematic) and oil flows thru a
check valve (A) and into base of left cylinder (master
cylinder), extending cylinder. Check valve (A) prevents
oil from escaping from cylinder after valve spool is de-
energized, keeping cylinder from drifting. Oil also flows
thru two pilot lines (represented by dashed lines on
hydraulic schematic) and extends two pilot pistons (B
and D). One pilot piston forces open a check valve (B)
which allows oil to flow out of top side of left cylinder
thru another check valve (C) and into base of right
cylinder (slave cylinder), extending cylinder. Other pilot
piston forces open check valve (D) on top side of right
cylinder (slave cylinder), allowing oil to flow from top
side of cylinder, flow thru valve spool and into oil return
line.
If
SEAT DOWN
button on hand control is selected (in
normal table orientation), motor pump is energized and
valve spool for that function moves to a down function
position (oil will now flow in new oil flow path that has
been created; this path is shown by crossed flow
symbols on hydraulic schematic) and oil flows thru a
check valve (D) and into top of right cylinder (slave
cylinder), retracting cylinder. Check valve (D) prevents
oil from escaping from right cylinder after valve spool is
de-energized, keeping cylinder from drifting. Oil also
flows thru two pilot lines (represented by dashed lines
on hydraulic schematic) and extends two pilot pistons.
One pilot piston forces open a check valve (C) which
allows oil to flow out of base of right cylinder thru
another check valve (B) and into top side of left cylinder
(master cylinder), retracting cylinder. Other pilot piston
forces open check valve (A) on base of left cylinder
(master cylinder), allowing oil to flow out of base of
cylinder, thru valve spool, and into oil return line.
Column Functions
If
TABLE UP
button on hand control is selected, motor
pump energizes and valve spool for that function moves
to an up function position (oil will now flow in new oil
flow path that has been created; this path is shown by
straight flow symbols on hydraulic schematic) and oil
flows thru a check valve (A) and into base of column
cylinder, extending cylinder. Check valve (A) prevents
oil from escaping from column cylinder after valve spool
is de-energized, keeping cylinder from drifting. Oil flows
out of top side of column cylinder as necessary, thru
valve spool, and into return line.
If
TABLE DOWN
button on hand control is selected,
motor pump energizes and valve spool for that function
moves to a down function position (oil will now flow in
new oil flow path that has been created; this path is
shown by crossed flow symbols on hydraulic sche-
matic) and oil flows to top side of base cylinder, retract-
ing cylinder. Oil also flows thru a pilot line (represented
by a dashed line on hydraulic schematic) and extends a
pilot piston. Pilot piston forces open check valve (A) on
base of cylinder, allowing oil to flow out of base of
cylinder, thru valve spool, and into oil return line.
Floor Lock Functions
If
ENABLE / LOCK
button on hand control is selected,
motor pump energizes and valve spool for main floor
lock cylinders moves to an up function position (oil will
now flow in new oil flow path that has been created; this
path is shown by straight flow symbols on hydraulic
schematic) and oil flows thru a check valve (A) and into
base of three main floor lock cylinders, extending
cylinders. Check valve (A) prevents oil from escaping
from three main floor lock cylinders after valve spool is
de-energized, keeping cylinders from drifting.
After approximately 10 seconds, main controller board
de-energizes motor pump and main floor lock spool and
then reenergizes motor pump and energizes outrigger
floor lock valve spool to an up function position (oil will
now flow in new oil flow path that has been created; this
path is shown by straight flow symbols on hydraulic
schematic) and oil flows thru two check valves (B and
C) and into the base of two outrigger floor lock cylin-
ders, extending cylinders. As soon as pressure in
outrigger floor lock cylinders reaches 10 BARS (145
PSI), outrigger pressure relief valve opens, dumping oil
back to return line. Outrigger cylinders were designed
to add stability to table on an uneven floor.
Three main floor lock cylinders lift table off of casters;
then the two outrigger floor lock cylinders extend with
enough power to stabilize table
without
lifting
table
further.
Check valves (B and C) prevent oil from escaping from
two outrigger floor lock cylinders after valve spool is de-
energized, keeping cylinders from drifting.
If
UNLOCK & ENABLE
buttons on hand control is
selected for three seconds, motor pump energizes and
main floor lock valve spool moves to a down function
position (oil will now flow in new oil flow path that has
been created; this path is shown by crossed flow
Page 1-6Printed in U.S.A.© Schaerer Mayfield USA, Inc. 2004
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