Skytron ELITE Series User manual

Page69
ELITE SERIES SURGICALTABLES
MAINTENANCE MANUAL
MODEL ELITE 3500 AND 3500B
REV 6/05

Page63
SECTIONIHYDRAULICSYSTEM......................................................................................................................... 1
1-1. General ........................................................................................................................................................ 1
1-2. ComponentOperation .................................................................................................................................. 2
a. Motor/PumpOperation ............................................................................................................................ 2
b. PressureRelief Valve ............................................................................................................................. 2
c. Mini-Valves............................................................................................................................................. 3
d. Mini-valvein Neutral Position.................................................................................................................. 3
e. Mini-Valve Right Port Activated .............................................................................................................. 4
f. Mini-Valve Left Port Activated ................................................................................................................ 4
g. HydraulicCylinders(SlaveCylinders) ..................................................................................................... 5
h. ElevationCylinderReturnCircuit............................................................................................................. 7
i. Brake System......................................................................................................................................... 7
j. EmergencyBrakeRelease...................................................................................................................... 8
k. Flex/Reflex System ................................................................................................................................. 8
1-3. HydraulicAdjustments................................................................................................................................. 9
a. FluidLevel. ............................................................................................................................................. 9
b. BleedingTheHydraulicSystem .............................................................................................................. 9
c. PressureRelief Valve ............................................................................................................................. 9
d. SpeedControls ....................................................................................................................................... 9
SECTION II MECHANICAL TABLE ADJUSTMENTS ........................................................................................... 11
2-1. Back Section Gear Mesh Adjustment ........................................................................................................ 11
2-2. HydraulicCylinderAdjustment ................................................................................................................... 11
a. Back Section ........................................................................................................................................ 11
b. LegSection........................................................................................................................................... 11
c. Slide and Kidney Lift Cylinders .............................................................................................................. 12
2-3. Slide RollerAdjustment .............................................................................................................................. 12
SECTIONIIIHYDRAULICTROUBLESHOOTING................................................................................................. 13
3-1. Precautions ............................................................................................................................................... 13
3-2. TroubleshootingNotes ............................................................................................................................... 13
3-3. ELEVATIONDIAGNOSISCHART............................................................................................................. 14
3-4. TRENDELENBURGDIAGNOSISCHART.................................................................................................. 15
3-5. LATERAL- TILT DIAGNOSIS CHART ...................................................................................................... 16
3-6. BACKSECTIONDIAGNOSISCHART ....................................................................................................... 17
3-7. FLEX SYSTEM DIAGNOSIS CHART......................................................................................................... 18
3-8. LEGSECTIONDIAGNOSISCHART .......................................................................................................... 19
3-9. KIDNEY LIFT DIAGNOSIS CHART ........................................................................................................... 20
3-10. SLIDE DIAGNOSISCHART ....................................................................................................................... 21
3-11. BRAKECIRCUITDIAGNOSISCHART ...................................................................................................... 22
3-12. FlexibleHose Identification and Placement ................................................................................................ 23
3-13. Kidney Lift System ..................................................................................................................................... 24
a. Bleeding the System.............................................................................................................................. 24
b. CylinderAdjustment............................................................................................................................... 25
SECTION IV ELECTRICAL SYSTEM................................................................................................................... 26
4-1. General ...................................................................................................................................................... 26
4-2. Components .............................................................................................................................................. 26
4-3. BatteryModelComponents......................................................................................................................... 26
TABLE OF CONTENTS
Although current at time of publication, SKYTRON's policy of continuous development makes this manual subject to change
without notice. REV 6/05

Page64
TABLE OF CONTENTS (cont.)
SECTIONVELECTRICALSYSTEMTROUBLESHOOTING ................................................................................ 28
5-1. TroubleshootingNotes ................................................................................................................................28
5-2. Main Switch................................................................................................................................................ 28
5-3. PendantControl .......................................................................................................................................... 29
5-4. Relay Box................................................................................................................................................... 30
5-5. Solenoids.................................................................................................................................................... 32
5-6. Motor/Pump Assembly ............................................................................................................................... 33
5-7. Return-to-LevelMicro-Switches .................................................................................................................. 35
5-8. Return/InhibitSystemTroubleshooting ....................................................................................................... 36
SECTIONVI -3500B-BATTERYMODEL,ELECTRICALTROUBLESHOOTING................................................. 42
6-1. General ...................................................................................................................................................... 42
6-2. TroubleshootingNotes ................................................................................................................................42
6-3. Main Switch................................................................................................................................................ 42
6-4. Batteries .................................................................................................................................................... 44
6-5. BatteryChargingBox/AC120VTransformer ............................................................................................... 44
6-6. Switch-OverRelay ..................................................................................................................................... 46
6-7. PendantControl .......................................................................................................................................... 47
6-8. Auxiliary Switches ..................................................................................................................................... 48
6-9. Relay Box................................................................................................................................................... 48
6-10. MainWire Harness Continuity Test............................................................................................................ 50
6-11. Solenoids.................................................................................................................................................... 51
6-12. Motor/Pump Assembly ............................................................................................................................... 52
6-13. Return-to-LevelMicro-Switches .................................................................................................................. 53
6-14. Return/InhibitSystemTroubleshooting ....................................................................................................... 54
SECTION VII -3500B- BATTERY MODEL, ELECTRICAL SYSTEM ADJUSTMENTS......................................... 60
7-1. Relay Box Adjustments .............................................................................................................................. 60

Electrical Specifications
Power requirements
Current Leakage
Power Cord
ENTELA CERTIFIED
TO UL2601-1,
CAN/CSA601.1, IEC 60601-2-46
120 VAC, 60Hz, 450 Watts
Less than 100 micro amps
15 feet w/hospital grade connector
(removeable on battery model)
60˚
90˚
8-1/2"
6"
40-1/2" 19"
26-45"*
21-3/4"
19-3/4"
79"
6"
9-1/2" 18-1/2" 25" 23"
TOPVIEW
SIDE VIEW END VIEW
3500 Series SurgicalTable Specifications

INDICATES DANGEROUS VOLTAGE, 120 V, 60 Hz
FUSE TYPE 10 AMP, FAST ACTING (FA)
CLASS I DEFIBRILLATION PROOF, TYPE B EQUIPMENT- IPX4 RATED.
INTERNALLY POWERED EQUIPMENT
PROTECTIVE GROUNDING.
IN ORDER TO ENSURE PROPER GROUNDING RELIABILITY,
THIS TABLE MUST BE CONNECTED TO A PROPERLY GROUNDED
HOSPITAL GRADE OUTLET.
CONNECTION FOR NEUTRAL CONDUCTOR SUPPLIED
UNIT TO BE USED ONLY IN SPECIFIED ENVIRONMENTAL CONDITIONS
IPX4
V
TEMPERATURE: 15˚ - 30˚ C (60˚ -85˚ F)
ENCLOSURE CLASS
VOLTAGE RATING OF THE UNIT
AAMPERAGE RATING OF THE UNIT
HZ FREQUENCY OF THE UNIT
ATTENTION, CONSULT MANUAL FOR FURTHER INSTRUCTIONS.
INDICATES SPECIAL USER ATTENTION.
POWERED BY BATTERY
BATTERY TYPE: SEALED
LEAD ACID 12V, VALVE REGULATED
16AH, 10HR (530W/10MIN)
FUSE:
POWERED BY AC VOLTAGE
AC VOLTAGE
HUMIDITY: 30% - 60% RELATIVE HUMIDITY, NON CONDENSING
TYPE B
EQUIPMENT
N
EQUIPMENT LABELS AND SPECIFICATIONS
BATTERY MODELS
15 AMP FAST ACTING INTERNAL FUSE
15A
10A

Page1
SECTION I HYDRAULIC SYSTEM
1-1. General
Electro-Hydraulic System
The hydraulic system (with the exception of the
hydraulic cylinders and hoses) is contained within
the base of the table. The hydraulic valves and
pump are electrically controlled by the use of a
hand-heldpushbuttonpendantcontrol. Thepower
requirementsfor thetable are120 VAC,5 amp,60
Hz.
The table contains the following components. Re-
fertotheblockdiagram(figure1-1)forrelationship.
Figure 1-1. Hydraulic Block Diagram
ELEV TREND TILT FLEX BACK LEG KIDNEY SLIDE
MOTOR/PUMP
ASSEMBLY
MINI-VALVES
PRESSURE
RELIEFVALVE
EMERGENCY
BRAKE
RELEASE
BRAKE
BRAKE SYSTEM
SLIDE
PLUMBING
TERMINAL
ELEVATION
TREND
TILT
BACK
BACK
LEG KIDNEY
KIDNEY LEFT
SIDE
FRAME
RIGHT
SIDE
FRAME
LEG
246810
1359111213
7

Page2
PRESSURE
RELIEFVALVE
MAIN PRESSURE
OIL GALLEY
(INTERNAL)
MAIN RETURN
OIL GALLEY
(INTERNAL)
MINI-VALVES
MOTOR/PUMP
ASSEMBLY
PUMP INLET OIL
RESERVOIR
PUMP
OUTLET
Figure 1-3. Pressure Relief Valve Not
Functioning
Figure 1-2.
a. Oil Reservoir - Main oil supply. Approximately
two quarts.
b. Motor/Pump Assembly - A positive displace-
ment gear type pump provides the necessary oil
pressure and volume.
c. PressureReliefValve-Providesanalternateoil
pathwhen the hydrauliccylinders reach theend of
their stroke.
d. Electro/HydraulicMini-ValveAssemblies-These
direct the fluid to the appropriate hydraulic cylin-
ders.
e. Hydraulic Lines, Fittings, Connections - They
provide a path for the hydraulic oil.
f. HydraulicCylinders-Theyconvertthehydraulic
fluidpressureandvolumeintomechanicalmotion.
1-2. Component Operation
a. Motor/Pump Operation
Themotor/pumpassemblyisageartypepumpthat
provides the oil pressure and volume for the entire
hydraulic system. The pump has an inlet side and
an outlet side. The inlet side is connected to the
reservoirwhichprovides theoil supply. Thereser-
voir has a very fine mesh screen strainer which
preventsforeign materialfrom entering theoil sys-
tem.
Theoutputlineofthepumpisconnectedtothemain
oil galley which is internal and common to all the
hydraulic mini-valves and pressure relief valve.
Also, common to the hydraulic mini-valves and
pressure relief valve is an oil galley that internally
connectstotheoilreservoirtoprovideareturnpath
for the hydraulic oil. See figure 1-2.
b. Pressure Relief Valve
Thisdeviceprovidesanalternateoilpathwhenthe
hydraulic cylinders reach the end of their stroke
andthepumpcontinuestorun. Ifthispathwerenot
provided, the pump motor would stall because the
oil cannot be compressed. The pressure relief
valveisdirectlyconnectedtothemini-valvebodies
and shares both the common internal main pres-
sure oil galley, and the return oil galley, that inter-
nally connect to the reservoir.
Figure 1-4. Pressure Relief Valve Functioning
050305.06
PRESSURE RELIEF
ADJUSTMENT NUT
PRESSURE
GAUGE
SPRING
LOADED
PLUNGER
PRESSURE
RETURN
050305.07
PRESSURE RELIEF
ADJUSTMENT NUT
PRESSURE
GAUGE
SPRING
LOADED
PLUNGER
OIL LINE
FROM
PUMP
OIL RESERVOIR

Page3
OIL RETURN
(RETURN)
OIL GALLERY
(PRESSURE) SPOOL VALVE SOLENOID PISTON
PILOT
PLUNGER
CHECK
VALVE
SPEED
CONTROL
BALL
VALVE OIL LINEOIL LINE
The main component of the valve is an adjustable
spring loaded plunger that is pushed off from its
seatbytheoilpressure. Theoilthenflowsbackinto
the reservoir. Turning the adjustment nut clock-
wiseincreasestheamountofoilpressurerequired
to open the valve, and turning it counterclockwise
decreasestheamountofoilpressure. (Seeadjust-
ment section for specification.)
c. Mini-Valves
The operation of the mini-valves is identical for all
table functions except the elevation and Single
ActionBrake circuits. These two hydraulic circuits
use a 3-way (single check valve) type mini-valve.
All other functions use a 4-way (dual check valve)
type mini-valve.
Either type mini-valve is controlled by two pushing
type, electrically operated solenoids. The sole-
noids push the spool valve (located in the lower
portion of the valve) one way or the other. This
motion opens the main supply galley (which has
pumppressure)allowing theoil toflowthrough the
variousparts ofthe mini-valveto thefunction. The
spool valve also opens an oil return circuit which
allows the oil to return to the oil reservoir.
The main components of the mini-valve and their
functions are listed below:
1. Spool Valve - Opens the main oil galley
(pumppressure)toeithermini-valveoutletdepend-
ing on which direction the spool valve is pushed.
Also it provides a return path for the oil returning
back into the reservoir.
2. Pilot Plunger - There are two plungers in a
four-way mini-valve (one in a 3-way mini-valve),
one under each check valve. The purpose of the
pilot plungers is to mechanically open the return
check valve allowing the oil to return back into the
reservoir.
3. Check Valve - Two are provided in each
four-way mini-valve to seal the oil in the cylinders
andoillinesandpreventanymovementofthetable.
Onecheckvalveisprovidedina3-waymini-valve.
4. Speed Adjustments - There are two speed
adjustments in each mini-valve. They are needle
valve type controls which restrict the volume of oil
returning back into the reservoir, thereby control-
lingthespeedofthetablesurfacemovement. A3-
way mini-valve has only one speed adjustment.
Thespeedcontrolsarealwayslocatedinthereturn
oilcircuit. Thispreventsuncontrolledmovementof
thepistonintheslavecylinderduetoonesideofthe
piston being loaded with hydraulic pressure and
the other side having no load.
Also,byusingthiscontrolmethod,itdoesn’tmatter
what size cylinder and piston is used because the
speedcanbecontrolledbyrestrictingthereturnoil.
Ifthepumpputsoutmorevolumetoacertainslave
cylinder than the speed control is allowing to go
back to the reservoir, the pressure relief valve
provides an alternate path for the pump oil.
d. Mini-Valve in Neutral Position
(No fluid flow) See figure 1-5.
1. Spool Valve Centered - This closes off both
oil pressure and oil return galleys.
2. PilotPlungersBothClosed-Thepilotplung-
ers control the opening of the check valves. If they
are closed, the check valves must be closed.
3. Check Valves - Both check valves are
closed trapping the oil in the cylinder and oil lines.
4. Speed Adjustment - When the mini-valve is
in the neutral position, the speed adjustment does
notaffectanythingbecausethereisnotanyoilflow.
Figure 1-5. Mini-Valve in Neutral Position

Page4
1. Spool Valve -Pushed to the right by electric
solenoid.Thisopenstheinternaloilpressuregalley
allowingthefluidtogothroughthecheckvalveand
ontothe cylinder. Also, thespool valveopens the
oil return line providing an oil path through the
internal oil galley back to the reservoir.
2. PilotPlungerValve -Right pilotplunger valve
ispushedupbytheincomingoilpressuremechani-
cally opening the check valve located above it in
thereturncircuit. Thisactionallowstheoilfromthe
right side of the slave cylinder to go back into the
reservoir. Theleftpilotplungervalveisnotaffected
in this operation mode.
3. Check Valves - Both check valves are
opened in this operation mode. The left valve is
pushed open by the oil pressure created by the
pump. The oil then continues to go through the
lines and pushes the slave cylinder piston to the
right. Atthesametime,therightcheckvalveis held
open mechanically by the pilot plunger providing a
returnpathfortheoilthroughthemini-valvebackto
the reservoir.
4. Speed Adjustment - The left speed control
(output side) does not have any effect in this oper-
ation mode because the oil is routed around the
speed adjustment through a by-pass valve and
thentotheoutputport. Therightspeedadjustment
controls the speed of the table function by restrict-
ing the amount of oil going back to the reservoir.
e. Mini-Valve Right Port Activated
(See figure 1-6)
Slave Cylinder Piston Moves to Left
Right Mini-Valve Port is Supply Line
Left Mini-Valve Port is Return Line
f. Mini-Valve Left Port Activated
(See figure 1-7.)
Slave Cylinder Piston Moves to Right
Left Mini-Valve Port is Supply Line
Right Mini-Valve Port is Return Line
1. Spool Valve - Pushed to the left by electric
solenoid. This opens the internal oil pressure gal-
ley allowing the fluid to go through the check valve
andontothecylinder. Also, thespoolvalveopens
the oil return line providing an oil path through the
internal oil galley back to the reservoir.
2. PilotPlunger Valve- Left pilotplunger valve
ispushedupbytheincomingoilpressuremechani-
cally opening the check valve located above it in
thereturncircuit. Thisactionallowstheoilfromthe
left side of the slave cylinder to go back into the
reservoir. The right pilot plunger valve is not
affected in this operation mode.
3. Check Valves - Both check valves are
opened in this operation mode. The right check
valveispushedopenbytheoilpressurecreatedby
thepump. Theoilthencontinuestogothrough the
lines and pushes the slave cylinder piston to the
left. At the same time, the left check valve is held
open mechanically by the pilot plunger providing a
returnpathfortheoilthroughthemini-valvebackto
the reservoir.
4. SpeedAdjustment-Therightspeed control
(output side) does not have any effect in this
operation mode because the oil is routed around
thespeedadjustmentthroughaby-passvalve and
then to the output port. The left speed adjustment
controls the speed of the table function by restrict-
ing the amount of oil going back into the reservoir.
Figure 1-7 Mini-Valve Left Port ActivatedFigure 1-6. Mini-Valve Right Port Activated
INLET OUTLET

Page5
O-RINGS
PISTONS
O-RINGS
RAM
RACK GEAR
RAM HYDRAULIC LINE
PISTON
O-RING
O-RING
1. Trendelenburg, Back Section and Leg Sec-
tion Cylinders - The double action cylinders are
closed at one end and have a movable piston with
hydraulic fluid on both sides. Connected to this
pistonisaramorshaftthatexitsoutoftheotherend
ofthecylinder.Throughtheuseof eitheraballand
socket, a gear, or clevis and pin arrangement, the
ram is connected to a movable table surface.
The movable surface can be moved one way or
the other by pumping hydraulic fluid into the cylin-
der on either side of the piston. Obviously, if oil is
pumped into one side of the cylinder, a return path
mustbeprovided fortheoilon theotherside. See
figure 1-9.
3. Kidney Lift Cylinders - The two kidney lift
cylindersare similar to theslide cylinder in that the
ramhasrackgearteethcutintothetopsurface. O-
Ringsoneach endof theram allowtheram toalso
serve as the pistons.
The rack teeth cut into the top of the ram meshes
with a pinion gear. This gear meshes with other
gearsto supply the up ordown drive for the kidney
lift bars, depending on which direction the oil is
pumped into the cylinder. See figure 1-11.
g. Hydraulic Cylinders (Slave Cylinders)
Thereareseveraldifferenttypesofhydrauliccylin-
ders used in the table that activate the control
functions. With the exception of the elevation and
brake cylinders, all operate basically the same
way. The control functions are listed below: (See
figure 1-8.).
Trendelenburg--1, double action cylinder
Back Section--2, double action cylinders
Leg Section--2, double action cylinders
Slide--1, double action cylinder
Kidney Lift--2, double action cylinders
Lateral Tilt--1, double action cylinder
Elevation--1, single action cylinder
Brakes--4, single action cylinders
2. Slide Cylinder Assembly - This cylinder
arrangement has two pistons, one on each end of
a ram which has rack gear teeth cut into its top
surface. These teeth mesh with a gear arrange-
ment that drives a rack gear connected to the
bottom of the side frame.
Whenhydraulicfluidispumpedintoonesideofthe
cylinder, the pistons are pushed in one direction,
thegeararrangementrotatesandcausesthetable
top to slide. Oil pressure can be applied to either
piston, making the table slide end for end. See
figure1-10.
Figure 1-8. Cylinder Placement
Figure 1-9. Back Section Cylinder
Figure 1-10. Slide Cylinder Assy.
BACK SECTION
CYLINDER LEG SECTION
CYLINDER
SLIDE
CYLINDER
TRENDELENBURG
CYLINDER
ELEVATION
CYLINDER
KIDNEY LIFT
CYLINDER
LATERALTILT
CYLINDER

Page6
O-RINGS O-RINGS
RAM
PINION
GEAR
Figure 1-11. Kidney Lift Cylinder Assembly
4. LateralTiltAssembly-Thelateraltiltassem-
bly consists of two cylinders, pistons and connect-
ing rods. The connecting rods attach to the lateral
tiltleverwhich connectsto the tablecenter column
assembly. The cylinder housing attaches to the
table top and is attached to the center column
assembly by pivots. See figure 1-12.
The pistons and connecting rods are attached to a
non-movable surface. Therefore, when hydraulic
fluid is pumped into one side, the cylinder housing
itselfmovesaroundthelateraltiltlevercausingthe
table top to tilt to one side.
Totilt thetable topin the oppositedirection, fluidis
pumped into the opposite cylinder.
Figure 1-13. Elevation Cylinder Assembly
6. Brake Cylinders - The brake cylinders are
single action type similar to the elevation cylinder.
The movable piston's ram is connected to a brake
pad.Seefigure1-14. Oilpumpedintothetopofthe
cylinder pushes the piston down raising the table
baseoffitscasters. Aninternalreturnspringonthe
bottomofthepiston,pushesthepistonuptoreturn
the oil through the mini-valve to the reservoir.
Figure 1-12. Lateral Tilt Cylinder Assembly
5. ElevationCylinder -This singleaction cylin-
der does not have hydraulic fluid on both sides of
thepiston.Itdependsontheweightofthetabletop
assembly to lower it. Figure 1-14. Brake Cylinder
The cylinder is set in the center of the elevation
maincolumn. Thetwostagecylinderiselevatedby
thedrivenforceoftheoilpressure. Whenlowering,
theoilthatisaccumulatedinthecylinderisreturned
totheoilreservoirthroughthemini-valveduetothe
table top weight.
A slider support assembly is used to support the
weightoftheuppertable section. Astainlesssteel
shroud covers the flexible hydraulic hoses and
slider. See figure 1-13.
ELEVATION
CYLINDER
SHROUD
ELEVATION
COLUMN
SECONDARY
PISTON
PRIMARY
PISTON
CONNECTING RODS
O-RINGS
PISTON
LATERAL
TILT LEVER PISTON
O-RINGS
OIL LINE
BRAKE
PAD RAM
RETURN
SPRING
PISTON

Page7
i. Brake System
Thebrakesystemconsistsofthefollowingcompo-
nents: (figure 1-16)
1. Single action slave cylinders (4 each).
2. 3-way(singlecheckvalvetype)mini-valve.
3. Manually controlled emergency brake re-
lease.
4. Plumbing terminal, flexible hoses, copper
lines and "O" rings.
5. Portions of the electrical system.
h. Elevation Cylinder Return Circuit
A three-way (single check valve type) mini-valve
controlsboththeelevationandreturncircuits. The
elevation circuit operation within the mini-valve is
identical to the operation of the four-way valves
previously described (inlet pressure opens the
checkvalveallowingtheoiltoenterthecylinder).In
the return position, inlet pressure pushes the pilot
plunger up and opens the return check valve. See
figure1-15.Theopencheckvalveallows apathfor
the oil in the elevation cylinder to return to the
reservoir. When the pilot plunger valve is opened,
thecontinuingpump pressure opens thepressure
relief valve which provides a return oil path to the
reservoir.
The mini-valve used in the elevation circuit con-
tains only one check valve (all four-way mini-
valves use two check valves). The check valve is
usedtotraptheoilintheelevationcylinderthereby
supporting the table top. When the top is being
loweredthecheckvalveismechanicallyheldopen
by the pilot plunger through pump pressure.
Figure 1-16. Brake System Block Diagram
Each corner of the cast-iron table base has a
hydraulic brake cylinder. These single action cyl-
indersarehydraulicallyconnectedinparalleltothe
mini-valve and all four are activated together. It is
normalforonecornerofthetabletoraisebeforethe
others due to the weight distribution of the table.
An electronic timer in the relay box is activated
when any function on the pendant control is
pushed momentarily. The pump/motorandbrake
systemmini-valve isactivated andthe brake cylin-
ders are completely set. The electronic timer runs
for approx. 8-10 seconds.
The brakes are released by pushing the BRAKE
UNLOCK button momentarily. An electronic timer
in the relay box activates the brake function hy-
draulic mini-valve and pump/motor.
Figure 1-15. Elevation Return Circuit
INLET
RETURN TO
RESERVOIR
TO RESERVOIR
THROUGH
PRESSURE
RELIEF VALVE
050305.19
MOTOR/PUMP
ASSEMBLY
PLUMBING
TERMINAL
PRESSURE
RELIEF VALVE
DR
EMERGENCY
BRAKE RELEASE
BRAKES
M
050305.20

Page8
When activated, the return hydraulic circuit oper-
ates similar to the elevation cylinder return circuit.
Returnspringsinsidethe singleactionbrakecylin-
ders retract the brake pads and provide the pres-
suretoreturnthehydraulicoilbacktothereservoir.
The electronic timer operates the return circuit for
approximately 8-10 seconds.
j. Emergency Brake Release
Theemergencybrakereleaseissimplyamanually
operatedbypass valveconnected in parallel to the
brakecylinders and the oilreservoir. See figure 1-
17. When the valve is opened (turned counter-
clockwise) a return circuit for the brake hydraulic
fluidisopened. Thereturnspringsforcethepistons
up pushing the hydraulic oil back into the reservoir
and retracting the brake pads.
1. The brakes will release slowly- depending
onhowloosethevalveis,thiscouldtakeanywhere
from a few minutes to several hours.
2. None of the table functions will operate
properly if the valve is wide open. All of the
hydraulic fluid from the pump is simply pumped
through the brake bypass circuit because that is
the easiest path for the oil to follow.
k. Flex/Reflex System
The Flex/Reflex system has a mini-valve which
connects the trendelenburg and back section hy-
draulic systems in a series. When FLEX is acti-
vatedbythependant control,theFlex/Reflexmini-
valve opens the oil pressure path to the Reverse
Trendelenburgpiston. Thereturnoilpath fromthe
trendelenburg piston is routed through the back
section cylinder to the mini-valve return port. See
figure1-18.
IMPORTANT
•The emergency brake release valve
mustbetightenedsecurelywhennotin
use.
•If the emergency brake release valve
has been operated, the UNLOCK but-
tononthe pendantcontrol mayhave to
be pressed before brakes will lock
again.
If the emergency brake release valve is open or
loose, two conditions could occur:
EMERGENCY BRAKE
RELEASE LEVER
Figure 1-17.
Figure 1-18. Flex/Reflex System
TREND
REV. TREND
BACK
DOWN
BACK UP
PLUMBING
TERMINAL
FLEX/REFLEX
MINI-VALVE

Page9
LONG 6 mm
PLUMBING
BOLT
PRESSURE
GAUGE
PRESSURE
RELIEFVALVE
1-3. Hydraulic Adjustments
a. Fluid Level.
Thefluid level should beapproximately 1/2" below
thefiller holeor gasketsurface. If additionalfluid is
needed, remove the filler vent cap with a phillips
screwdriver and add fluid through this opening
using a funnel. See figure 1-19.
NOTE
The elevation cylinder should be com-
pletely down and all the other control
functions in their neutral position when
checking oil level.
c. Pressure Relief Valve
Thepressurerelief valveis adjustedbyturning the
adjustmentnutuntilthedesiredpressureisreached.
To adjust:
1. Remove the plumbing bolt securing the
brake system line to the pressure relief valve and
attach a hydraulic pressure gauge as shown in
figure 1-20 using a long 6mm plumbing bolt.
2. Raise the table top until the piston reaches
the end of its stroke and stalls. Observe reading
on pressure gauge and turn the adjustment nut
(clockwise to increase oil pressure, counter-
clockwise to decrease) until desired reading is
obtained. Pressure should be 80KG/CM† -1138
PSI.
d. Speed Controls
Thespeedcontrolsrestrictthevolumeofoilreturn-
ing back to the reservoir thereby controlling the
speed of each control function.
All four-way mini-valves, have two speed controls
located in the ends of each valve body. All three-
way mini-valves have only one speed control.
Figure 1-19.
ThetypeofoilthatshouldbeusedisMobilDTE#25
or equivalent. This is a very high quality hydraulic
oil. The table requires approximately two quarts of
oil to operate properly.
b. Bleeding The Hydraulic System
Topurgetheairfromthehydraulicsystem,operate
each function back and forth at least two or three
times.
NOTE
Wheneverahydrauliclineorcom-ponent
isreplaced,bleedtheairoutofthelines
using the pump pressure before mak-
ing the final connection. Then operate
the function until it stalls in both direc-
tions.
Figure 1-20.
RESERVOIR
OPENING
FILLER
CAP
FILLER VENT

Page10
One speed control adjusts one direction of a
particular function and the opposite speed control
adjuststheotherdirection. Theyareadjustableby
using a small straight blade screwdriver and
turning the adjustment screw clockwise to de-
crease the speed and counterclockwise to
increase the speed. Refer to figure 1-21.
Figure 1-21.
Any control function should move in either direc-
tionatthesamerate. Iftherateofacertainfunction
is too slow, open the speed control slightly and
recheck. Usethesecondhandonawatchandtime
aparticularfunction. Matchthattimeintheopposite
direction by opening or closing the speed control.
Approximate operating times are as follows:
Elevation Down 30 seconds
LateralTilt 7 seconds
Leg-Up 25 seconds
Leg-Down 15 seconds
Kidney Lift 7 seconds
Slide 20 seconds
Apressure gauge should beused to set thespeed
of the back section, trendelenburg and flex control
functions.
To adjust:
1. Attachthepressuregaugeontothe main oil
galley as shown in figure 1-20.
2. Thegaugeshouldread the following values
when operating the various control functions in
either direction. Turn the speed controls until
desired values are obtained.
Back Section Up 65KG/CM†925PSI
Dn 65KG/CM†925PSI
Trendelenburg Up 65KG/CM†925PSI
Dn 65KG/CM†925PSI
Flex 70KG/CM†995PSI
Reflex 70KG/CM†995PSI
NOTE
WhenadjustingFlex/Reflexspeedcon-
trols, set Reflex last.
Elevation - There is not a speed adjustment for
raisingthe table. Thespeed controlwill only affect
the rate of descent and it should equal the rate of
elevation.
TABLE DOWN
TREND
TILT RIGHT REFLEX
BACK UP BRAKE
LEG DOWN
KIDNEY UP
SLIDE
HEAD
SLIDE
FOOT
KIDNEY
DOWN
LEG UP
BACK DOWN
FLEX
TILT LEFT
REV.
TREND

Page11
SECTION II MECHANICAL TABLE ADJUSTMENTS
2-1. Back Section Gear Mesh Adjustment
Thegear meshis adjusted by the useof aneccen-
tric cam. This cam moves the gear teeth closer
together to eliminate gear lash. This adjustment
arrangement compensates for any wear between
the gears that might occur.
To adjust:
Loosen the cam locking allen set screw. Use an
allen wrench to rotate the eccentric cam. See
figure2-1. Tightenthesetscrewwhenadjustment
is complete.
2-2. Hydraulic Cylinder Adjustment
Back & Leg Sections
The hydraulic cylinder rams that control both the
back and leg sections must move together so that
thesesectionsarenottwistedwhenoperated. This
is accomplished by the use of eccentric cams that
movethecylinderbodiesforeandafttoadjusttheir
effective stroke.
NOTE
Adjust gear mesh before adjusting ec-
centric cams for the back section.
a. Back Section
Position the back section all the way up until it
stalls. Both sides of the back section should stop
moving at the same time and should not show any
signs of twisting.
b. Leg Section
Position the leg section all the way up until it is
horizontal. Both sides of the leg section should
stopmovingatthe sametimeandshouldnotshow
any signs of twisting.
Any twisting or flexing of the leg section as it
approaches the stalled position indicates that one
of the cylinders is not reaching its fully extended
position at the same time as the other and an
adjustment is required.
Any twisting or flexing of the back section as it
approaches the stalled position indicates that one
of the cylinders is not reaching its fully extended
position at the same time as the other. This
condition would require an adjustment.
To adjust:
Removethetopfromtheseatsectionforaccessto
the locking set screws.
Loosen the set screw located above the eccentric
cam in each side frame. Use an allen wrench to
turnthecylindereccentriccamsasrequiredtoshift
either cylinder fore or aft as needed so no twisting
orflexingof thebacksection isobservedwhen itis
stalledinthefullupposition. Tightenthesetscrews
and replace the seat section top when proper
adjustment has been achieved. See figure 2-2.
Figure 2-2. Back Section Adjustment
Figure 2-1. Eccentric Cam Adjustment
SET SCREW
ALLEN
WRENCH
ECCENTRIC
CAM
SEAT SECTION TOP
SET
SCREW BACK SECTION CYLINDER
ECCENTRIC CAM
BACK SECTION

Page 12
LEG SECTION
SET SCREW
LEG SECTION CYLINDER
ECCENTRIC CAM
To adjust:
Loosen the cam locking set screws located on the
bottom of the cylinder mounting plates inside the
table side frames. Use an allen wrench to turn the
cylinder eccentric cams as required to shift either
cylinder fore or aft as needed so no twisting or
flexing of the leg section is observed when it is
stalled in the horizontal position. Tighten set screws
when proper adjustment is achieved. See figure 2-
3.
Figure 2-3. Leg Section Adjustment
c. Slide and Kidney Lift Cylinders
If the Slide or Kidney Lift cylinder has been re-
moved, the distance from the end of the piston to
the end of the cylinder housing must be checked to
make sure the functions will operate correctly.
With table top centered, the distance from the end
of the Slide piston to end of cylinder is:
Head End - 82 mm Foot End - 120 mm
The table top should slide 7-1/2" toward the head
and 13-1/4" toward the foot when positioned prop-
erly. Refer to figure 2-4.
With Kidney Lift all the way down, the distance
from the end of the Kidney Lift piston to end of
cylinder is:
Head End - 82 mm Tail End - 11 mm
Figure 2-4.
2-3. Slide Roller Adjustment
The pivot pins on the slide rollers are eccentric
cams. The rollers can be adjusted if required to
maintain proper top slide operation.
NOTE
During Trendelenburg positioning, top
slide movement of up to 1/2" can be
considered normal due to gear lash.
To adjust:
Remove the Seat section top, the hose cover and
the right and left lateral tilt frame covers for access
to the top rollers.
1. Align the table top so the rollers to be
adjusted are contacting the slide bars.
2. Loosen the adjustment cam set screw and
adjust the roller using an 8mm Allen wrench. See
figure 2-5. To avoid any possible binding in the slide
mechanism, adjust the roller on the opposite side of
the table in the same manner (cam turned toward
same end of table on each side).
3. Adjust rollers so top slides smoothly with no
up or down movement of the table top.
4. When adjustment is complete, tighten set
screws, replace covers and top section.
Figure 2-5.
82mm
120mm
7-1/2"
SLIDE
TOWARD
HEAD
13-1/4"
SLIDE
TOWARD
FOOT
SLIDE
ROLLER
8mm
ALLEN
WRENCH
SET SCREW

Page13
SECTION III HYDRAULIC TROUBLESHOOTING
3-1. Precautions
Before attempting to troubleshoot any hydraulic
problemon the table,please read through thepre-
cautions and notes below.
CAUTION
Whendisconnectinganyofthehydrau-
lic lines, fittings, joints, hoses, etc., for
the following control functions, be sure
these table surfaces are in their down
position or completely supported.
Elevation
Back Section
Leg Section
Kidney Lift
When working on the trendelenburgor
lateral tilt hydraulic circuits, be sure to
supportthetabletop. Whenworkingon
thebrakesystemmakesurethebrakes
are completely retracted.
CAUTION
Failuretofollowtheseprecautionsmay
result in an uncontrolled oil spray and
damage to the table or personal injury.
3-2. Troubleshooting Notes
When troubleshooting a table malfunction, first
determinethefollowing:
1. Does the problem affect all control func-
tions?
2. Does the problem affect only one control
function?
3. Iftheproblemaffectsonecontrolfunctionis
it in both directions?
4. Is the problem intermittent?
5. Is the problem no movement of a table
surfaceordoesthetablesurfaceloseposi-
tion?
Oncethe problem has been determined, concen-
trate on that particular hydraulic circuit or control
function.
Listed below are the hydraulic components that
are common with all hydraulic circuits. If there is a
problem with any of them, it could affect all control
functions.
1. Motor/Pump Assembly
2. Reservoir
3. Pressure Relief Valve
4. Certain Oil Lines and Galleys
Iftherewasaprobleminthefollowingcomponents,
only one control function would normally be af-
fected.
1. Mini-Valve
2. Slave Cylinder
3. Oil Lines
NOTE
Whenever a hydraulic line or compo-
nentisreplaced,bleedtheairoutofthe
lines using the pump pressure before
making the final connection. After all
connections are tight, cycle the control
function back and forth two or three
timestopurgetheremainingairfromthe
system.
IMPORTANT
When installing new "O" rings use hy-
draulic oil or white lithium grease to
thoroughly lubricate the "O" rings and
cylinder. Keep everything clean.
Each complete oil circuit is shown on the following
pages. Whentroubleshootingaparticularfunction,
refer to the appropriate oil circuit diagram and the
list of possible problems.

Page14
SECONDARY
PISTON
O-RING
FLEXIBLE
HOSE
INTERNAL OIL RETURN
TO RESERVOIR
PRIMARY
PISTON
O-RING
INTERNAL OIL
FROM PUMP
MINI-VALVE
SPEED
CONTROL
CHECK
VALVE
COPPER
LINE PLUMBING
TERMINAL
3-3. ELEVATION DIAGNOSIS CHART
Figure 3-1. Elevation Circuit
Problem Reason
Table will not elevate properly Pressure Relief Valve Not Set Properly
Low on Oil
Spool Valve Not Centered or Adjusted Properly
Defective Pump
Defective Mini-Valve
Defective Solenoid or Wiring
Defective Relay Box or Pendant Control
Table will not descend properly Incorrect Speed Adjustment
Bad Check Valve
Spool Valve Not Centered
Defective Solenoid or Pendant Control
Table loses elevation Bad Check Valve
Leaking Mini-Valve
Loose Fittings, Joints, Hoses
Leaking "O" Ring Inside Cylinder