Skytron 6700B HERCULES User manual

SURGICALTABLE
MODEL 6700B HERCULES
MAINTENANCE MANUAL
7/05

7/05
Table of Contents
SECTION I HYDRAULIC SYSTEM ....................................................................................................... 1
1-1. General ......................................................................................................................................... 1
1-2. ComponentOperation................................................................................................................... 2
a. Motor/Pump Operation ............................................................................................................. 2
b. Pressure Relief Valve .............................................................................................................. 2
c. Mini-Valves............................................................................................................................... 3
d. Mini-valve in Neutral Position ................................................................................................... 3
e. Mini-Valve Right Port Activated................................................................................................ 4
f. Mini-Valve Left Port Activated .................................................................................................. 4
g. Hydraulic Cylinders (Slave Cylinders) ..................................................................................... 5
h. Elevation Cylinder Return Circuit ............................................................................................. 7
i. Brake System........................................................................................................................... 7
j. Emergency Brake Release ...................................................................................................... 8
k. Flex/Reflex System ................................................................................................................... 8
1-3. Hydraulic Adjustments.................................................................................................................. 9
a. Fluid Level ................................................................................................................................ 9
b. Bleeding The Hydraulic System ............................................................................................... 9
c. Pressure Relief Valve .............................................................................................................. 9
d. Speed Controls......................................................................................................................... 9
SECTION II MECHANICAL TABLE ADJUSTMENTS.......................................................................... 11
2-1. Back Section Gear Mesh Adjustment.......................................................................................... 11
2-2. Hydraulic Cylinder Adjustment .................................................................................................... 11
a. Back Section ........................................................................................................................... 11
b. Leg Section ............................................................................................................................. 11
2-3. Head Section Adjustment ............................................................................................................ 12
SECTION III HYDRAULIC TROUBLESHOOTING .............................................................................. 13
3-1. Precautions.................................................................................................................................. 13
3-2. Troubleshooting Notes................................................................................................................. 13
3-3. ELEVATION DIAGNOSIS CHART............................................................................................. 14
3-4. TRENDELENBURG DIAGNOSIS CHART ................................................................................ 15
3-5. LATERAL - TILT DIAGNOSIS CHART....................................................................................... 16
3-6. FLEX SYSTEM DIAGNOSIS CHART ........................................................................................ 17
3-7. BACK SECTION DIAGNOSIS CHART...................................................................................... 18
3-8. LEG SECTION DIAGNOSIS CHART......................................................................................... 19
3-9. KIDNEY LIFT DIAGNOSIS CHART ........................................................................................... 20
3-10. BRAKE CIRCUIT DIAGNOSIS CHART..................................................................................... 21
3-11. Flexible Hose Identification and Placement ................................................................................. 22
3-12. Kidney Lift System....................................................................................................................... 23
Althoughcurrent at timeof publication,SKYTRON's policy ofcontinuous developmentmakes this manual
subject to change without notice.

SECTION V ELECTRICAL TROUBLESHOOTING ............................................................................. 27
5-1. General ........................................................................................................................................ 27
5-2. Troubleshooting Notes................................................................................................................. 27
5-3. Main Switch ................................................................................................................................. 27
5-4. Batteries....................................................................................................................................... 28
5-5. Battery Charging Box/AC 120V Transformer .............................................................................. 28
5-6. Pendant Control ........................................................................................................................... 30
5-7. Auxiliary Switches ....................................................................................................................... 32
5-8. Relay Box .................................................................................................................................... 32
5-9. Main Wire Harness Continuity Tests ........................................................................................... 34
5-10. Solenoids ..................................................................................................................................... 36
5-11. Motor/Pump Assembly ................................................................................................................ 37
5-12. Return-to-Level / Positioning Inhibit Micro-Switches ................................................................... 38
5-13. Troubleshooting ........................................................................................................................... 39
Table of Contents (continued)
WARNING
Indicatesapossibilityofpersonalinjury.
CAUTION
Indicates a possibility of damage to
equipment.
NOTE
Indicates important facts or helpful hints.
SECTION IV ELECTRICAL SYSTEM................................................................................................... 26
4-1. General ........................................................................................................................................ 26
4-2. Components ................................................................................................................................ 26
4-3. Battery Model Components ......................................................................................................... 26

BASIC RECOMMENDED TOOLS:
1/8". 1/4" STRAIGHT BLADE SCREWDRIVERS
#2 PHILLIPS SCREWDRIVER
HYDRAULIC PRESSURE GAUGE SKYTRON P.N. 6-050-02
METRIC ALLEN® WRENCHES 1.5mm-8mm
ADJUSTABLE CRESCENT WRENCH
DIGITAL VOLTMETER, TRUE RMS
METRIC OPEN END WRENCHES 7mm-18mm
LEVEL (CARPENTERS)
BASIC RECOMMENDED MAINTENANCE PROCEDURES
The basic items notes below should be inspected at a minimal interval period of 6 months (dependant on
usage). For optimal usage, safety and longevity of the product, have it serviced only by an authorized
Skytron representative with authentic Skytron replacement parts.
• Check Power Cord (if applicable)
• Check Pendant Control (if applicable)
• Check Oil Level in Reservoir
• Check For Hydraulic Leaks
• Check Pressure Relief Valve Setting
• Check All Table Functions
• Check Side Rails
• Check Velcro
• Check Lateral Tilt Housing Bolts
• Lubricate Elevation Slider Assembly with SKYTRON Slider Grease P/N D6-010-89
• Tighten X-Ray Top Stand-Offs, Use Loc-tite
• Lubricate Castors
•Check brake pads for wear and inspect brake cylinders for proper operation.
Only facility-authorized SKYTRON trained, maintenance personnel should troubleshoot the
SKYTRON 6700B Surgical Table. Trouble shooting by unauthorized personnel could result
in personal injury or equipment damage.
How to contact us:
Skytron
5000 36th St. SE, Grand Rapids, MI 49512
PH: 1-800-759-8766 (SKY-TRON)
FAX: [phone]

INDICATES DANGEROUS VOLTAGE, 120 V, 60 Hz
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)
15 AMP INTERNAL CIRCUIT BREAKER
POWERED BY AC VOLTAGE
AC VOLTAGE
HUMIDITY: 30% - 60% RELATIVE HUMIDITY, NON CONDENSING
TYPE B
EQUIPMENT
N
EQUIPMENT LABELS AND SPECIFICATIONS
15A

Electrical Specifications
Power requirements
Current Leakage
Power Cord
120 VAC, 60Hz, 450 Watts
Less than 100 micro amps
15 feet w/hospital grade
connector (removable)
12-1/2" 19-1/4" 23" 24-1/4"
14-1/2"
19-3/4"
5-3/4"
3"
76"
TOP VIEW
90˚
60˚
14-1/2"
36"
SIDEVIEW
8-1/2"
5-3/4"
19"
21-3/4"
44" MAX
23" MIN
ENDVIEW
ENTELA CERTIFIED
TO UL2601-1
CAN/CSA601.1, IEC 60601-2-46
SERIAL NUMBER TAG
6700B Hercules General Purpose Surgical Table Specifications

Page1
Figure 1-1. Hydraulic Block Diagram
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
requirements for the table are 120 VAC, 5 amp, 60
Hz.
Thetablecontainsthefollowingcomponents. Refer
to the block diagram (figure 1-1) for relationship.
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 thehydraulic cylindersreach theend of
their stroke.
d. Electro/HydraulicMini-ValveAssemblies-These
direct the fluid to the appropriate hydraulic cylin-
ders.
SECTION I HYDRAULIC SYSTEM
041905.020MJ
ELEV BRAKEKIDNEYLEGBACKFLEXTILTTREND
1
1
2
3
2
25 42
779
68
48
10
10 11
11 12
10
1 3 5
6
79 11
MOTOR/PUMP
ASSEMBLY
PLUMBING
TERMINAL
ELEVATION
CYLINDER
TRENDELENBURG
CYLINDER
TILT
CYLINDER
BACK SECTION KIDNEY LIFT LEG SECTION
PRESSURE
RELIEF VALVE
(4) BRAKE ASSEMBLIES
EMERGENCY
BRAKE RELEASE
MINI-
VALVES
3
45
67 89

Page2
The main component of the valve is an adjustable
spring loaded plunger that is pushed off from its
seatbytheoilpressure. Theoilthenflowsbackinto
the reservoir. See figure 1-4. Turning the adjust-
ment nut clockwise increases the amount of oil
pressure required to open the valve, and turning it
counterclockwisedecreasestheamountofoilpres-
sure. (See adjustment section for specification.)
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 theoilsupply. The reser-
voir has a very fine mesh screen strainer which
preventsforeign materialfrom enteringtheoil 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.
Figure 1-4. Pressure Relief Valve Functioning
Figure 1-3. Pressure Relief Valve Not
Functioning
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. See figure 1-3.
041905.021m
j
MAIN PRESSURE
OIL GALLERY (internal)
MINI-VALVES
OIL RESERVOIR
PUMP
OUTLET
PUMP
INLET
PRESSURE
RELIEF VALVE
MOTOR/PUMP
ASSEMBLY
MAIN RETURN
OIL GALLERY
(internal)
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
Figure 1-5. Mini-Valve in Neutral Position
c. Mini-Valves
The operation of the mini-valves is identical for all
table functions except the elevation and brake
circuits. These two hydraulic circuits use a 3-way
(singlecheckvalve)typemini-valve.Allotherfunc-
tions 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 theoilto flowthrough the
variousparts ofthemini-valve tothefunction. 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
(pump pressure) to either mini-valve outlet de-
pending 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
and oil lines and prevent any movement of the
table. 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
the piston in the slave cylinder due to one side of
the 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
not affect anything because there is not any oil
flow.

Page4
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
Figure 1-7. Mini-Valve Left Port Activated
1. Spool Valve-Pushed to the right by electric
solenoid.Thisopenstheinternaloilpressuregalley
allowingthefluidtogothroughthecheckvalveand
ontothe cylinder. Also, thespoolvalve opensthe
oil return line providing an oil path through the
internal oil galley back to the reservoir.
2. PilotPlungerValve -Rightpilot plungervalve
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.
Figure 1-6. Mini-Valve Right Port Activated
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.
INLET OUTLET INLET
OUTLET

Page5
Figure 1-9. Trendelenburg Cylinder Assy.
3. LateralTiltAssembly-Thelateraltiltassem-
bly consists of two cylinders, pistons and connect-
ing rods. The connecting rods attach to the lateral
tilt lever which connects to the table side frames.
When hydraulic fluid is pumped into one cylinder,
thepistonandconnectingrodpushesthelateraltilt
leverwhichtilts thetable topto oneside. Totiltthe
table top in the opposite direction, fluid is pumped
into the opposite cylinder. See figure 1-10.
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.
Back Section -----2 double action cylinders
Leg Section ------- 2 double action cylinders
Trendelenburg ----1 double action cylinder
LateralTilt----------1 double action cylinder
Elevation ----------- 1 single action cylinder
Kidney Lift ---------2 double action cylinders
Brakes--------------4 single action cylinders
1. Back Section and Leg Section Cylinders -
The double action cylinders are closed at one end
and have a movable piston with hydraulic fluid on
both sides. Connected to this piston is a ram or
shaft that exits out of the other end of the cylinder.
Through the use of either a gear, or clevis and pin
arrangement, this 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 forthe oilontheother side. See
figure 1-8.
Figure 1-8. Back Section Cylinder
2. Trendelenburg Cylinder Assembly - The
Trendelenburg tilt assembly consists of two cylin-
ders,pistonsandconnectingrods. Theconnecting
rods connect to the Trendelenburg lever which
connects to the table side frames via the
Trendelenburgaxis. Whenhydraulicfluidispumped
into one cylinder, the piston and connecting rod
pushes the Trendelenburg lever which tilts the
table top. To tilt the table top in the opposite
direction,fluidispumpedintotheoppositecylinder.
See figure 1-9.
Figure 1-10. Lateral Tilt Cylinder Assembly
041905.02
2
BACK
SECTION
O-RING RAM PISTON
HYDRAULIC
LINE
HYDRAULIC
LINE
041905.02
4
LATERAL
TILT LEVER
CONNECTING RODS
PISTON
PISTON
041905.023m
j
TRENDELENBURG
LEVER
PISTONS

Page6
Figure 1-12. Kidney Lift 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.Seefigure1-13. Oilpumpedintothetopofthe
cylinder pushes the piston down raising the table
baseoffitscasters. Aninternalreturnspringonthe
bottomofthepiston,pushesthepistonuptoreturn
the oil through the mini-valve to the reservoir.
4. ElevationCylinder -Thissingle actioncylin-
der does not have hydraulic fluid on both sides of
thepiston.Itdependsontheweightofthetabletop
assembly to lower it.
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
weightoftheupper table section. Astainless steel
shroud covers the flexible hydraulic hoses and
slider. See figure 1-11.
Figure 1-11. Elevation Cylinder Assembly
5. Kidney Lift - The two kidney lift cylinder
assemblies are a unique type of double action
cylinder where the piston remains stationary and
the outer housing or cylinder has the relative mo-
tion. The cylinder housing has rack teeth cut into
thetopwhichmesheswithapiniongear. Thisgear
meshes with other gears to supply the up or down
drive for the kidney lift bars, depending on which
direction the oil is pumped into the cylinder. See
figure1-12. Figure 1-13. Single Action Brake Cylinder
041905.025
PRIMARY
PISTON
SECONDARY
PISTON
ELEVATION
CYLINDER
SLIDER
ASSEMBLY
EXTERIOR
SHROUD
ASSEMBLY
041905.02
6
PINION
GEARS
OIL FLOW
CYLINDER
HOUSING
PISTON
KIDNEY LIFT
BAR
OIL
FLOW
041905.02
7
OIL LINE
RETURN SPRING
BRAKE PAD
PISTON

Page7
3. Manually controlled emergency brake re-
lease.
4. Plumbing terminal, flexible hoses, copper
lines and "O" rings.
5. Portions of the electrical system.
Figure 1-15. 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
system mini-valve are activated and the brake
cylinders 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 1-14. Elevation Return Circuit
i. Brake System
Thebrakesystemconsistsofthefollowingcompo-
nents: (figure 1-15)
1. Single action slave cylinders (4 each).
2. 3-way (single check valve type) mini-valve.
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
figure1-14.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.
041905.029
TO RESERVOIR THROUGH
PRESSURE RELIEF VALVE
INLET
RETURN TO
RESERVOIR
041905.028
MOTOR/PUMP
ASSEMBLY
PLUMBING
TERMINAL
BRAKE
BRAKE
BRAKE
BRAKE
EMERGENCY
BRAKE RELEASE
PRESSURE
RELIEF
VALVE
BRAKE
MINI-VALVE

Page8
When activated, the return hydraulic circuit oper-
ates similar to the elevation cylinder return circuit.
Returnspringsinsidethe singleaction brakecylin-
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 valveconnectedin parallelto the
brakecylinders andthe oilreservoir. See figure1-
16. 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.
Figure 1-16.
NOTE
•The emergency brake release valve
mustbetightenedsecurelywhennotin
use.
•If the emergency brake release valve
has been operated, the UNLOCK but-
tononthe pendantcontrolmay haveto
be pressed before brakes will lock
again.
If the emergency brake release valve is open or
loose,thebrakeswillreleaseslowly-dependingon
how loose the valve is, this could take anywhere
from a few minutes to several hours.
k. Flex/Reflex System
TheFlex/Reflexsystemincorporatesanadditional
mini-valve which connects the trendelenburg and
back section hydraulic systems in a series. When
FLEXisactivated bythependantcontrol, theFlex/
Reflexmini-valveopenstheoilpressurepathtothe
ReverseTrendelenburgpiston. Thereturnoilpath
fromtheTrendelenburgpistonisroutedthroughthe
back section cylinder to the mini-valve return port.
See figure 1-17
Figure 1-17. Flex/Reflex System
041905.030
EMERGENCY
BRAKE RELEASE
FLEX/
REFLEX
27
3 7
PLUMBING
TERMINAL
2
TREND.
7
BACK
UP
MINI-
VALVES
6
BACK
DOWN
2 6
3
REV.
TREND.
041905.031

Page9
Figure 1-19.
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. Pressureshould be8MPA (80KG/CM2-
1138 PSI). An erratic reading and/or inability to
adjust to the recommended setting may indicate
the need for replacement of the pressure relief
valve.
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.
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. See figure 1-20.
1-3. Hydraulic Adjustments
a. Fluid Level.
Thefluid levelshould be approximately1/2" below
thefiller holeorgasket surface.Ifadditional fluidis
needed, remove the filler vent cap with a phillips
screwdriver and add fluid through this opening
using a funnel. See figure 1-18.
NOTE
The elevation cylinder should be com-
pletely down, the brakes released and
all the other control functions in their
neutralpositionwhencheckingoillevel.
To adjust:
1. Removetheblindcapandattachahydraulic
pressuregauge tothe mainoil galleyusing a6mm
plumbing bolt. See figure 1-19.
Figure 1-18.
ThetypeofoilthatshouldbeusedisMobilDTE#25
or equivalent. This is a very high quality hydraulic
oil. The table requires approximately two quarts of
oil to operate properly. Excercise caution when
determining equivalance to avoid damage to the
hydraulic system.
b. Bleeding The Hydraulic System
Topurgetheairfromthehydraulicsystem,operate
each function back and forth at least two or three
times. NOTE
Whenever a hydraulic line or compo-
nentisreplaced,bleedtheairoutofthe
lines using the pump pressure before
makingthefinalconnection.Thenoper-
ate the function until it stalls in both
directions.
c. Pressure Relief Valve
Thepressurerelief valveisadjusted byturning the
adjustmentnutuntilthedesiredpressureisreached.
041905.032
FILLER CAP
FITTING
GASKET
OIL TANK
RESERVOIR
041905.033
PRESSURE
RELIEF
VALVE
PRESSURE
GAUGE
PLUMBING
BOLT

Page10
Apressure gaugeshould beused toset thespeed
ofthebacksection,Trendelenburgandflexcontrol
functions.
To adjust:
1. Attachthepressuregaugeontothe main oil
galley as shown in figure 1-19.
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/CM2-925PSI
Dn 65KG/CM2-925PSI
Trendelenburg Up 65KG/CM2-925PSI
Dn 65KG/CM2-925PSI
Flex 70KG/CM2-995PSI
Reflex 70KG/CM2-995PSI
NOTE
WhenadjustingFlex/Reflexspeedcon-
trols, set Reflex last.
Elevation - There is not a speed adjustment for
raisingthe table. Thespeedcontrol willonlyaffect
the rate of descent and it should equal the rate of
elevation.
Figure 1-20.
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:
LateralTilt 7 seconds
Back Up 25 seconds
Back Down 15 seconds
Kidney Lift 7 seconds
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
TABLE DOWN
TRENDELENBURG
REVERSE TREND.
TILT RIGHT
TILT LEFT
REFLEX
FLEX
BACK UP
BACK DOWN
FOOT DOWN
FOOT UP
KIDNEY UP
KIDNEY DOWN
BRAKES 041905.034

Page11
SECTION II MECHANICAL TABLE ADJUSTMENTS
2-1. Back Section Gear Mesh Adjustment
Thegear meshisadjusted bythe useofan eccen-
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
figure 2-1. Tighten the locking set screw when
adjustment is complete.
To adjust:
Removetheseatsection topfor accessto the cam
locking set screws and loosen the set screws.
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 back
section is observed when it is stalled in the full up
position. See figure 2-2. Tighten the set screws
and replace the seat section top when the adjust-
ment is completed.
Figure 2-1. Eccentric Cam Adjustment
2-2. Hydraulic Cylinder Adjustment
The hydraulic cylinder rams that control both the
backandfoot/legsectionsmustmovetogetherso
thatthesesectionsare nottwisted whenoperated.
This is accomplished by the use of eccentric cams
thatmove thecylinderbodies foreandaft toadjust
their 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.
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.
Figure 2-2. Back Section Adjustment
b. Leg Section
Position the leg section all the way up. Both sides
of the leg section should stop moving at the same
time and should not show 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.
041905.035
ALLEN WRENCH
ECCENTRIC
CAM
SET
SCREW
041905.03
6
BACK SECTION
SET
SCREW
BACK SECTION
CYLINDER
ECCENTRIC CAM
SEAT SECTION
TOP

Page12
NOTE
The leg section cylinder eccentric cam
is located under the nameplate on the
side casting. To make an adjustment,
the nameplate will have to be removed
and a new nameplate will have to be
installed when the adjustment is com-
pleted.
To adjust:
Loosen the cam locking set screws located inside
the table side frames. See figure 2-3. Use an allen
wrench to turn the cylinder eccentric cams as
requiredtoshifteithercylinderforeoraftasneeded
so no twisting or flexing of the leg section is ob-
served when it is stalled in the above horizontal
position. Tighten set screws when proper adjust-
ment is achieved.
Figure 2-3. Leg Section Adjustment
2-3. Head Section Adjustment
Thehead sectioncan beadjusted toeliminate any
flexing throughout it's range of travel.
To adjust:
Placetheheadsectioninlevelpositionandremove
the top. See figure 2-4. Loosen but do not remove
the allen bolts securing the bearing block to the
frame. Loosen the allen bolt in the top of the frame
and turn the set screw as required to achieve
proper adjustment. One or both of the blocks may
require adjustment to achieve proper alignment.
Tightenallallenboltswhenadjustmentiscomplete.
Testtheheadsectionthroughoutitsrangeoftravel.
Re-adjust as needed. Replace top section when
proper adjustment is achieved.
Figure 2-4. Head Section Adjustment
041905.037
6700B
NAMEPLATE LEG SECTION
LEG SECTION CYLINDER
ECCENTRIC CAM
(behind nameplate)
041905.03
8
ALLEN
BOLT
ALLEN
BOLTS
ADJUSTMENT
SET SCREW