Midmark 317-001 Service manual [gb]

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317

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Power

-001

Examination Table

Serial Number Prefix: KM

Service and

Parts Manual

-001

317

FOR USE BY MIDMARK TRAINED TECHNICIANS ONLY

SF-1568 Part No. 004-0074-00 Rev. G (1/01/04)

Page 2

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Page 3

TABLE OF CONTENTS

Section/Paragraph Page Section/Paragraph Page

IMPORTANT INSTRUCTIONS

General Safety Instructions......................................... iii

Safety Alert Symbols ................................................... iii

Warranty Instructions .................................................. iii

SECTION I GENERAL INFORMATION

1.1 Scope of Manual ......................................... 1-1

1.2 How to Use Manual ..................................... 1-1

1.3 Description of 117 Power Podiatry

Chair ........................................................ 1-1

1.4 Specifications ............................................. 1-4

1.5 Parts Replacement Ordering ....................... 1-6

1.6 Special Tools .............................................. 1-6

SECTION II TESTING AND TROUBLESHOOTING

2.1 Operational Test.......................................... 2-1

2.2 Troubleshooting Procedures ........................ 2-3

SECTION III SCHEDULED MAINTENANCE

3.1 Scheduled Maintenance .............................. 3-1

SECTION IV MAINTENANCE/SERVICE INSTRUCTIONS

4.1 Introduction ................................................. 4-1

4.2 Motor Cover Assembly Removal /

Installation ................................................ 4-1

4.3 Checking / Adding Oil To Motor Pump ......... 4-1

4.4 Up Functions Shuttle Valve Removal /

Installation ................................................ 4-2

4.5 Down Functions Shuttle Valve Removal /

Installation ................................................ 4-3

4.6 Anti-Cavitation Solenoid Valve Removal /

Installation ................................................ 4-4

4.7 Up Functions Relief Valve Removal /

Installation ................................................ 4-5

4.8 Down Functions Relief Valve Removal /

Installation ................................................ 4-6

4.9 Motor Pump Assembly - Complete

Removal / Installation ............................... 4- 7

4.1 0 Motor Pump Removal / Installation .............. 4- 9

4.1 1 Motor Shaft Seal Removal / Installation ....... 4- 9

4.1 2 Back Cylinder Removal / Installation.......... 4-11

4.1 3 Tilt Cylinder Removal / Installation ............. 4-13

4.1 4 Base Cylinder Removal / Installation .......... 4-15

4.1 5 AUTO RETURN "RETURN" or "STOP"

Switch Removal / Installation.................. 4-18

4.1 6 BACK UP / DOWN or TILT UP / DOWN

Switch Removal / Installation.................. 4-18

4.1 7 TABLE UP Or TABLE DOWN Switches

Removal / Installation / Adjustment ........ 4-19

4.1 8 Time Delay Relay Removal / Installation .... 4-20

4.1 9 Capacitors Removal / Installation ............... 4-21

4.2 0 Auto Return Relay [CR2] Or Manual Functions Relay [CR1] Removal /

Installation .............................................. 4-22

4.2 1 Tilt Down Limit Switch Removal /

Installation .............................................. 4-23

4.2 2 Base Down Limit Switch Removal /

Installation .............................................. 4-24

4.2 3 Chain Assembly Adjustment ...................... 4-25

4.2 4 Base Slide Assembly Removal /

Installation .............................................. 4-27

4.2 5 Reclining Arm Adjustment .......................... 4-30

4.2 6 Hydraulic System Flushing Procedure........ 4-30

SECTION V SCHEMATICS AND DIAGRAMS

5.1 Electrical Schematics / Wiring Diagrams..... 5-1

5.2 Hydraulic Flow Diagrams.............................. 5- 3

SECTION VI PARTS LIST

6.1 Introduction ................................................. 6-1

6.2 Description of Columns ............................... 6-1

6.3 Torque Specifications And Important

Assembly Notes ....................................... 6- 1

Pictorial Index .............................................. 6- 2

Back And Seat Components ......................6-3.*

Leg Components .......................................... 6-4

Upholstery Set ........................................... 6-5.*

Base Covers And Enclosures ...................... 6- 6

Base Mechanical Components ...................6-7.*

Hydraulic System......................................... 6- 8

Base Slide Assembly................................... 6-9

Base Electrical Components ...................... 6-10

Motor / Pump Components ........................ 6-11

Control Panel Assembly............................. 6-12

COMMENTS ............................................................ 7-1

FAX ORDERING FORM .......................................... 7-2

(*) Indicates that there has been a serial number break for the illustration

and that there are additional point page(s) following the original page.

Page 4

IMPORTANT INSTRUCTIONS

Return To Table Of Contents

General Safety Instructions

Safety First: The primary concern of Midmark Corporation is that this Power Podiatry Chair is

maintained with the safety of the patient and staff in mind. To assure that services and repairs are completed safely and correctly, proceed as follows:

(1) Read this entire manual before performing any

services or repairs on this chair.

(2) Be sure you understand the instructions

contained in this manual before attempting to service or repair this chair.

Safety Alert Symbols

NOTE

A NOTE is used to amplify an operating procedure, practice or condition.

Warranty Instructions

Refer to the Midmark “Limited Warranty” printed on the back cover of the Installation and Operation Manual for warranty information. Failure to follow the guidelines listed below will void the warranty and/or render the 317 Power Podiatry Chair unsafe for operation.

• In the event of a malfunction, do not attempt to operate the chair until necessary repairs have been made.

Throughout this manual are safety alert symbols that call attention to particular procedures. These items are used as follows:

DANGER

A DANGER is used for an imminently

hazardous operating procedure, practice, or condition which, if not correctly followed, will result in loss of life or serious personal injury.

WARNING

A WARNING is used for a potentially

hazardous operating procedure, practice, or condition which, if not correctly followed, could result in loss of life or serious personal injury.

CAUTION

A CAUTION is used for a potentially

hazardous operating procedure, practice, or condition which, if not correctly followed, could result in minor or moderate injury. It may also be used to alert against unsafe practices.

• Do not attempt to disassemble chair, replace malfunctioning or damaged components, or perform adjustments unless you are one of Midmark’s authorized service technicians.

• Do not substitute parts of another manufacturer when replacing inoperative or damaged components. Use only Midmark replacement parts.

EQUIPMENT ALERT

An EQUIPMENT ALERT is used for an

imminently or potentially hazardous operating procedure, practice, or condition which, if not correctly followed, will or could result in serious, moderate, or minor damage to unit.

Page 5

SECTION I

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GENERAL INFORMATION

SECTION I

GENERAL INFORMATION

1.1 Scope of Manual

This manual contains detailed troubleshooting, scheduled maintenance, maintenance, and service instructions for 317 Power Podiatry Chair. This manual is intended to be used by Midmark’s authorized service technicians.

1.2 How to Use Manual

A. Manual Use When Performing Scheduled Mainte-

nance. (1) Perform inspections and services listed in

Scheduled Maintenance Chart (Refer to para 3.1).

(2) If a component is discovered to be faulty or out

of adjustment, replace or adjust component in accordance with maintenance/service instructions (Refer to para 4.1).

B. Manual Use When Chair Is Malfunctioning And

Cause Is Unknown.

procedures (Podiatry - treatment of foot ailments). The major serviceable components of the chair are the

motor pump which includes an up functions relief valve, down functions relief valve, up functions shuttle valve, down function shuttle valve, and anti-cavitation solenoid valve, two capacitors, isolation transformer (export units only), tilt down limit switch, base down limit switch, control panel assembly which includes a manual functions relay (CR1), auto return relay (CR2), time delay relay, and terminal blocks, BACK UP / DOWN switches (RH and LH), TILT UP / DOWN switches (RH and LH), AUTO RETURN "RETURN" switches (RH and LH), AUTO RETURN "STOP" switches (RH and LH), foot control which includes TABLE UP switches and TABLE DOWN switches, tilt cylinder, back cylinder, needle valve (older units only) base cylinder, reclining arm mechanism, foot section brake, base slide assembly, and chain assembly.

B. Theory of Operation (See Figure 5-1, Sheets 1 and

2 for wiring diagrams, Figure 5-2 for electrical schematics, and Figures 5-3 and 5-4 for hydraulic flow diagrams)

(1) Perform an operational test on chair (Refer to

para 2.1).

(2) Perform troubleshooting procedures listed in

Troubleshooting Guide (Refer to para 2.2).

(3) If a component is discovered to be faulty or out

of adjustment, replace or adjust component in accordance with maintenance/service instructions (Refer to para 4.1).

C. Manual Use When Damaged Component Is Known.

(1) Replace or adjust component in accordance

with maintenance/service instructions (Refer to para 4.1).

1.3 Description Of 317 Power Podiatry Chair

A. General Description (See Figure 1-1). The 317 Power Podiatry Chair is an examination chair

designed specifically for performing general podiatric

Electrical Power: Line voltage is supplied directly to the switches of the

chair. Up Functions Electrical Operation: Line voltage is continuously supplied to line side

terminals of all switches. Then, when a TILT UP, BACK UP, or BASE UP switch is pressed, the current flows thru the two poles of the selected switch. One pole of switch allows current to flow across the cylinder's solenoid valve and time delay relay, energizing the cylinder solenoid valve. The time delay relay delays current flow across the coil of the cylinder solenoid valve for 1/10 of a second, which allows time for the motor pump to develop hydraulic pressure. This prevents the selected function from drifting downward before starting to raise up and prevents a jerky start. The other pole of the switch allows current to flow across the manual functions relay (CR1), energizing the relay. When the manual functions relay (CR1) is energized, three subswitches within the relay are switched, the normally open (N.O.) subswitch CR1-A, the normally closed (N.C.) subswitch CR1-B, and the

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SECTION I

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GENERAL INFORMATION

BACK

CYLINDER

BASE DOWN

LIMIT SWITCH

RECLINING ARM

MECHANISM

ANTI-CAVITATION SOLENOID VALVE

MOTOR

PUMP

DOWN FUNCTION

SHUTTLE VALVE

UP FUNCTION

SHUTTLE VALVE MANUAL FUNCTIONS

RELAY (CR1)

AUTO RETURN

RELAY (CR2)

CONTROL PANEL

ASSEMBLY

TIME DELAY

RELAY

TERMINAL

BLOCKS

DOWN FUNCTION

RELIEF VALVE

UP FUNCTION

RELIEF VALVE

BASE

CYLINDER

TILT

CYLINDER

TILT DOWN

LIMIT SWITCH

FOOT

SECTION

BRAKE

AUTO RETURN

"RETURN"

SWITCH

AUTO RETURN

"STOP"

SWITCH

BACK

UP/DOWN

SWITCH

TILT

UP/DOWN

SWITCH

RIGHT HAND

CONTROL SWITCHES

FOOT

CONTROL

BASE SLIDE

ASSEMBLY

CHAIN

ASSEMBLY

CAPACITORS

TABLE DOWN

SWITCHES

TABLE UP

SWITCHES

MA420800

Figure 1-1. Major Components

Page 7

SECTION I

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GENERAL INFORMATION

N.C. subswitch CR1-C. If a subswitch was a normally open (N.O.) switch, it then switches to closed position (current can flow). If a subswitch was a normally closed (N.C.) switch, it then switches to an open position (current cannot flow).

The N.O. subswitch CR1-A closes, which applies current across the coil of the motor pump, causing the pump to run and supply pressure for the selected UP function. There are two capacitors in the motor pumps circuit which provide motor start and motor run power. Current is also applied across the coil of the anticavitation solenoid valve, energizing the valve and causing it to open. The N.C. subswitch CR1-B opens, which disables all DOWN functions while an UP function button is depressed. This prevents the motor pump from being run in the forward and reverse directions simultaneously, possibly damaging it. The N.C. subswitch CR1-C opens, which disables the AUTO RETURN "RETURN" and "STOP" buttons, the tilt down limit switch, and the base down limit switch. This also prevents the motor pump from being run in the forward and reverse directions simultaneously, possibly damaging it.

Up Functions Hydraulic Operation: When the motor pump starts pumping, suction is

created by the rotating pump gears, which allows oil to defeat the reservoir check valve and flow into the pump gears. The pump gears pressurize the oil which flows to the up function shuttle valve. The check ball and shuttle in the up function shuttle valve are pushed to the open position by the oil, allowing oil to flow through the shuttle valve by flowing around the check ball (with the shuttle in the open position, oil is prevented from flowing through the reservoir ports and returning to the reservoir). The oil then flows through the open cylinder solenoid valve at the base of the selected cylinder, extending the cylinder rod. When the cylinder rod extends, oil is forced out of the rod end of the cylinder, through the open anti-cavitation solenoid valve and to the down function shuttle valve. The check ball and the shuttle in the down function shuttle valve are pushed to the closed position by the oil, which prevents oil from flowing through the shuttle valve and into the motor pump, but allows the oil to flow through the newly uncovered reservoir ports into the reservoir. When the cylinder rod reaches the end of its travel, the up function relief valve opens when the pressure reaches 525 600 PSI (36.2 - 41.4 BARS) and allows the oil to return to the reservoir. This prevents the motor pump from developing pressures that are too high and damaging

the hydraulic system components, hoses, or the motor pump itself.

When the operator releases the selected function's switch, the motor pump shuts down and the anticavitation solenoid valve and the cylinder solenoid valve de-energize, causing the valves to close.

Down Functions Electrical Operation: Line voltage is continuously supplied to line side

terminals of all switches. Then, when a TILT DOWN, BACK DOWN, or BASE DOWN switch is pressed, the current flows thru the two poles of the selected switch. One pole of switch allows current to flow across the cylinder's solenoid valve and time delay relay, energizing the cylinder solenoid valve. The time delay relay delays current flow across the coil of the cylinder solenoid valve for 1/10 of a second, which allows time for the motor pump to develop hydraulic pressure. This prevents the selected function from drifting before starting to move and also prevents a jerky start. The other pole of the switch allows current to flow thru the N.C. subswitch CR1-B and then across the coil of the motor pump, causing the pump to run and supply pressure for the selected DOWN function. There are two capacitors in the motor pumps circuit which provide motor start and motor run power.

Down Functions Hydraulic Operation: When the motor pump starts pumping, suction is

created by the rotating pump gears, which allows oil to defeat the reservoir check valve and flow into the pump gears. The pump gears pressurize the oil which flows to the down function shuttle valve. The check ball and shuttle in the down function shuttle valve are pushed to the open position by the oil, allowing oil to flow through the shuttle valve by flowing around the check ball (with the shuttle in the open position, oil is prevented from flowing through the reservoir ports and returning to the reservoir). The oil then flows through the anti-cavitation solenoid valve and into the rod end of the cylinder, causing the cylinder rod to retract. When the cylinder rod retracts, oil is forced out of the base of the cylinder, through the open cylinder solenoid valve to the up function shuttle valve. The check ball and the shuttle in the up function shuttle valve are pushed to the closed position by the oil, which prevents oil from flowing through the shuttle valve and into the motor pump, but allows the oil to flow through the newly uncovered

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SECTION I

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GENERAL INFORMATION

reservoir ports into the reservoir. When the cylinder rod reaches the end of its travel, the down functions relief valve opens when the pressure reaches 250 - 325 PSI (17.2 - 22.4 BARS) and allows the oil to return to the reservoir. This prevents the motor pump from developing pressures that are too high and damaging the hydraulic system components, hoses, or the motor pump itself.

When the operator releases the selected function's switch, the motor pump shuts down and the cylinder solenoid valve de-energizes, causing the valve to close.

Auto Return Function Operation: When the operator presses one of the two AUTO

RETURN "RETURN" buttons, current is applied across the normally closed contacts of the tilt down limit switch and base down limit switch and then across the coil of the auto return relay (CR2), energizing the relay. When the auto return relay (CR2) is energized, three subswitches within the relay are switched; the N.O. subswitch CR2-A, the N.O. subswitch CR2-B, and the N.O. subswitch CR2-C.

contact set (terminals 5 and 6) closes, energizing the base cylinder solenoid valve. The third contact set (terminals 7 and 8) opens, leaving the base down limit switch as the sole source of power for the auto return relay (CR2). When the base cylinder solenoid valve is energized, the base function lowers until the base down limit switch is tripped. There are two sets of contacts in the base down limit switch. When the base down limit switch is tripped, one contact set (terminals 3 and 4) opens, de-energizing the base cylinder solenoid valve. The second contact set (terminals 7 and 8) opens, opening the auto return relay (CR2) and causing the relay to de-energize. The auto return sequence is now complete.

If the operator needs to stop the table top from lowering for any reason, one of the two AUTO RETURN "STOP" buttons can be pressed. When one of N.C. "STOP" buttons is pressed, the circuit to the auto return relay (CR2) is opened, removing current flow from the coil of the auto return relay (CR2) and causing it to deenergize. Current flow to the coil of the cylinder solenoid valve and motor pump is stopped, causing the auto return function to stop.

When subswitch CR2-A switches, current now flows across the N.C. AUTO RETURN "STOP" switches and the coil of the auto return relay (CR2), keeping the relay energized even after the operator has released the AUTO RETURN "RETURN" switch. This also allows the STOP buttons to become functional. Pressing a STOP button will open the circuit, which will de-energize the auto return relay (CR2), thereby stopping the auto return function. When subswitch CR2-B switches, current flows across the tilt cylinder's solenoid valve and the time delay relay, energizing the tilt cylinder solenoid valve. The time delay relay delays current flow across the coil of the tilt cylinder solenoid valve for 1/10 of a second, which allows time for the motor pump to develop hydraulic pressure. This prevents the selected function from drifting before starting to move and also prevents a jerky start. When subswitch CR2-C switches, current flows across the coil of the motor pump, causing the pump to run and supply pressure for the AUTO RETURN sequence. There are two capacitors in the motor pump circuit which provide motor start and motor run power.

The TILT function lowers until the tilt down limit switch is tripped. There are three sets of contacts in the tilt down limit switch. When the tilt down limit switch is tripped, one contact set (terminals 3 and 4) opens, deenergizing the tilt cylinder solenoid valve. The second

General Information: The anti-cavitation solenoid valve is in the hydraulic

system to prevent oil from escaping out of the rod end of a cylinder while the chair is not being moved. Otherwise, a cylinder rod would be able to extend on its own if upward pressure was placed on that function of the chair top by the doctor or patient.

The cylinder solenoid valves are in the hydraulic system to prevent oil from escaping out of the base of the cylinder assemblies. Otherwise, a cylinder assembly could retract on its own, allowing the table top to drift.

On some older units, there is a needle valve attached to the rod end of the back cylinder. On these units, the needle valve is used to adjust the speed of the back cylinder.

The motor has a thermal overload switch which automatically activates if motor becomes overheated, shutting the motor down. The motor is designed for intermittent, not continuous duty. Running the motor continuously will cause the overload switch to activate.

Page 9

1.4 Specifications

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Factual data for the 317 Power Podiatry Chair is provided in Table 1-1. Also, see Figure 1-2.

Table 1-1. Specifications

SECTION I

GENERAL INFORMATION

Motor Pump Reservoir Capacitor .... 1 quart (0.946 liter)

Electrical Requirements:

115 VAC Unit........................... 110 - 120 VAC, 60 HZ,

8 amp, single phase

Description Data

Weight:

Without Shipping Carton................ 392 lb (177.8 kg)

With Shipping Carton..................... 475 lb (215.5 kg)

Shipping Carton.. 74.25 in. "L" x 29 in. "W" x 33 in. "H"

(188.6 cm x 73.66 cm x 83.8 cm)

Dimensions (See Figure 1-2):

Table Top Length (w/o headrest)..... 59 in. (149.9 cm)

Table Top Length (min) ................... 68 in. (172.7 cm)

Table Top Length (w/ headrest &

foot section extended)................... 96 in. (243.8 cm)

Table Top Width (w/ armrests) .......... 26 in. (66.0 cm)

Overall Width..................................... 26 in. (66.0 cm)

Table Positioning:

Tilt Section.........................................................0 - 27°

Back Section .....................................................0 - 85°

Table Top Height (Adjustable):........ 26.0 in. to 42.0 in.

(66.0 cm to 106.7 cm)

Table Speeds (@ 60 Hz.):

Base Up ................................................ 9 ±1 seconds

Back Up................................................. 9 ±1 seconds

Tilt Up.................................................... 5 ±1 seconds

Power Consumption:

115 VAC Unit......................................... 1440 WATTS,

8 amps @ 120 VAC

Recommended Circuit:

A separate (dedicated) circuit is recommended for this table. The table

should not

be connected to an electrical circuit with other appliances or equipment unless the circuit is rated for the additional load.

68" LONG (MIN.)

96" LONG (MAX.)

26"

ARM REST WIDE

17"

(MIN.) HEAD

EXTENSION

85°

14"

(MAX.)

FOOT

EXTENSION

° (OLD UNITS)

° (NEW UNITS)

23" BASE WIDE

Weight Capacity (Maximum)............. 300 lb. (136.0 kg)

Oil Used In Hydraulic System ..................... Light Grade

Oil Capacity ..................... Approx. 2.5 quarts (2.4 liters)

Medicinal Mineral Oil

42"

(MAX.)

26"

(Min.)

CORD

31"

BASE

Figure 1-2. Table Dimensions

CORD

MA420900

Page 10

SECTION I

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GENERAL INFORMATION

1.5 Parts Replacement Ordering

If a part replacement is required, order the part directly from the factory as follows:

(1) Refer to Figure 1-3 to determine the location of

the model number and serial number of the chair and record this data.

MODEL

NUMBER

SERIAL

NUMBER

MA290000

(2) Refer to the Parts List to determine the item

numbers of the parts, part numbers of the parts, descriptions of the parts, and quantities of parts needed and record this data (Refer to para 6.1).

NOTE

Ask the Purchasing Department of the company that owns the chair for this information. Otherwise, this information may be obtained from the dealer that sold the chair.

(3) Determine the installation date of the chair and

record this data.

(4) Call Midmark with the recorded information and

ask for the Medical Products Technical Services Department. See back cover of this manual for the phone number or use the Fax Order Form (See page 7-2 for Fax Order Form).

1.6 Special Tools

Table 1-2 lists all of the special tools needed to repair the chair, how to obtain the special tools, and the purpose of each special tool.

Figure 1-3. Model Number / Serial

Number Location

Table 1-2. Special Tool List

Description of Special Tool

Multimeter Commercially Available Any Type Used to perform continuity and voltage checks.

Torque Wrench Commercially Available Any Type Used to tighten hardware to specified torque values.

Manufacturer's

Name / Address / Phone

Manufacturer's

Par t N umb e r

Purpose of Special Tool

Page 11

TESTING AND TROUBLESHOOTING

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SECTION II

TESTING AND TROUBLESHOO TING

SECTION II

2.1 Operational Test

In order to effectively diagnose the malfunction of the chair, it may be necessary to perform an operational test as follows:

WARNING

Refer to the Operator Manual for

complete instructions on operating the chair. Failure to do so could result in personal injury.

NOTE

The Operational Test, for the most part, only describes what should happen when the chair is operated. If the chair does something other than described, a problem has been discovered. Refer to the Troubleshooting Guide to determine the cause of the problem and its correction.

(1) Plug the chair into a grounded, non-isolated,

correctly polarized outlet, that has the proper voltage output for the chair.

(2) Depress TABLE UP and TABLE DOWN foot

switches on the foot control. Depress the BACK UP / DOWN switch to the UP and DOWN positions. Depress the TILT UP / DOWN switch to the UP and DOWN positions.

(4) Raise TABLE UP and TILT UP function all the

way up.

(5) Press one of the AUTO RETURN "RETURN"

switches. After table top starts to move, press one of the AUTO RETURN "STOP" switches.

(6) Observe. When the AUTO RETURN "RE-

TURN" switch is pressed, the tilt function should begin to lower (and should keep lowering even after the RETURN switch is released). When the AUTO RETURN "STOP" switch is pressed, the table top should stop lowering.

(7) Press one of the AUTO RETURN "RETURN"

switches and allow the auto return sequence to finish.

(8) Observe. The tilt function should lower com-

pletely and stop; then the base down function should lower all the way down and stop. The motor pump should stop running, indicating that the base down limit switch has been tripped.

(9) Repeat steps 2 thru 8 using the function

switches on the other side of the chair.

(10) Push down on right side or pull up on left side

of brake handle and then slide foot section assembly in and out. Release brake handle.

(3) Observe. The table top should move in the

direction corresponding to the footswitch / switch which is being depressed. The range of movement should match the ranges listed below:

Table Positioning:

Tilt Section.........................................................0 - 27°

Back Section .....................................................0 - 85°

Table Top Height (Adjustable):........ 26.0 in. to 42.0 in.

(66.0 cm to 106.7 cm) No section of the table top should drift on its own after a footswitch / switch is released. Movement should be steady and should match the speeds listed below:

Table Speeds (@ 60 Hz.):

Base Up ................................................ 9 ±1 seconds

Back Up................................................. 9 ±1 seconds

Tilt Up.................................................... 5 ±1 seconds

(11) Observe. When brake handle is depressed,

the foot section assembly should be able to be moved in and out freely. When the brake handle is released, the foot section assembly should be locked in place securely.

NOTE

The release plunger may not automatically return to the locked position by itself. It may need to be worked into its locked position.

(12) Pull release plunger out and move reclining arm

up and down. Lower reclining arm all the way and allow release plunger to lock into position.

Page 12

SECTION II

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TESTING AND TROUBLESHOOTING

BACK

FUNCTION

RELEASE

PLUNGER

BRAKE

HANDLE

AUTO RETURN

"RETURN"

SWITCH

AUTO RETURN

"STOP"

SWITCH

BACK

UP/DOWN

SWITCH

TILT

UP/DOWN

SWITCH

TABLE UP

SWITCHES

Figure 2-1. Operational Test

FOOT

SECTION

ASSEMBLY

TABLE DOWN

SWITCHES

TILT

FUNCTION

MA421000

Page 13

SECTION II

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TESTING AND TROUBLESHOOTING

(13) Observe. When the release plunger is pulled

out, the reclining arm is unlocked and can be moved. When the reclining arm is lowered completely and the release plunger is released, the release plunger should lock the reclining arm in place.

Table 2-1. Troubleshooting Guide

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2.2 Troubleshooting Procedures

Table 2-1 is a Troubleshooting Guide which is used to determine the cause of the malfunction.

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.pmup

.esoolsnoitcennoceriWmorfgniriwkcehC

.pmup

tuptuodnatupnikcehC

noitalosifoegatlov

tcepsusecalpeR

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.)s(roticapacgnikrow

.setunim02ot51tiaWloocotpmuprotomwollA

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tupnireporpgniviecer

gniylppustonsitubegatlov

ecalper,tuptuoCAV511

.remrofsnartnoitalosi

refeR.)s(roticapacecalpeR

etarepootyrtnehtdna

seodpmuprotomfI.riahc

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.snoitcennocytridnaelC

degamad/esoolriapeR

Page 14

SECTION II

Return To Table Of Contents

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

melborPmotpmySesuaCelbaborPkcehCnoitcerroC

etarepotonlliwriahC

ropuxisehtfoynanehw

otuarosnoitcnufnwod

sinoitcnufnruter

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.gnizigrene

.nurtonseod

,PUTLIT,PUELBATehT

snoitcnufPUKCABdna

ELBATtub,krowtonod

,NWODTLIT,NWOD

NWODKCABdna

.odsnoitcnuf

.evom

/hctiwstoofynanehW

,desserpedsihctiws

tub,snurpmuprotom

.evomtonseodpotelbat

/hctiwstoofynanehW

,desserpedsihctiws

dnasnurpmuprotom

draehebnacdionelos

/hctiwstoofynanehW

,desserpedsihctiws

tub,smuhpmuprotom

nehwsnurpmuprotoM

hctiwstoofnoitcnufpuna ,desserpedsihctiws/ tonseodpotelbattub

siyaleryaledemiT

.gninoitcnuflam

.emitata

.liolarenim

.tuodenrubro

nowolsimetsysciluardyH

.riovreser

.nwolbsi)s(roticapaCtcepsusecalpeR

pudekcolsipmuprotoM

dionelosnoitativac-itnA

.gninoitcnuflamsievlav

oteriwrepmujaesU

yaledemitssapyb

,sevomelbatfI.yaler

.gninoitcnuflamsiyaler

enilniretemitlumatuP

dnayaleryaledemit/w

enorednilychcaenur

rednilyc

.yaler

asetacidnispma

dna

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nwonkhtiw)s(roticapac

.)s(roticapacgnikrow

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.pmuprotomgnikrow

thgilsrofkcehC

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noitativac-itnafoedis

,evlavdionelos

sidionelosgnitacidni

rotuodenrubton

-itnatcepsusecalper

dionelosnoitativac

nwonkhtiwevlav

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sievlavelttuhsnoitcnufpU

.gninoitcnuflam

morfsnoitcennoc

-itnaotkcolblanimret

dionelosnoitativac

retemitlumesU.evlav

reporprofkcehcot

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kcehcfieesotkcehC

puniesoolsillab

evlavelttuhsnoitcnuf

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.)gnirlatem

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ynaecalpeR.snoitcennoc

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elttuhsnoitcnufpuecalpeR

.4.4arapotrefeR.evlav

Page 15

SECTION II

Return To Table Of Contents

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

The TABLE U P, TI LT UP, and BACK UP functions do not work , bu t TABLE D OWN, TILT DOWN, and BACK DOWN functions do Conti n ue d .

Motor pump r uns when an up function footswitch / switch is depressed, but table top does not move - Continued.

Motor pu mp d oes no t run when an up function is selected, but does when a down function is selected.

Up functions relief valve is malfunctioning (popping relief too early).

Motor pump is defe ct ive. Repl ace s us pect m ot or

Wire connections loose. Check all wiring

Motor pump is defective Replace suspect motor

Wire connections loose. Check all wiring

Manual fu ncti on s re lay (CR1) i s malfunctioning.

Replace suspect up functions relief valve with known wo rk in g rel i ef val ve.

pump with known working motor pu mp.

connec ti on s fr om te rmi na l block to motor pump. Use multimeter to check for proper vol tage levels.

pump with known working motor pu mp.

connec ti on s fr om te rmi na l block to motor pump.

Check to see if manual functions relay (CR1) is energizing when an up function is selected. Also, check to see if there is volta ge at te r min al 4 o f subswi tc h CR1- A wh en manual fu ncti on s re lay (CR1) is energized.

Replace up functions relief valve. Refer to para 4.7.

Repl ace mo tor pu mp. Refer to para 4. 9, or 4.1 0.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

Repl ace mo tor pu mp. Refer to para 4. 9, or 4.1 0.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

If manual functions r elay (CR1) will not energize or if subswitch CR1-A does not close when CR1 is energized, then replace manual fu ncti on s re lay (CR1) . Refer to para 4.20.

The TABLE D OWN, T ILT DOWN, and BACK DOWN functions do not work, but TABLE UP, TILT UP, and BACK UP functi on s do.

Motor pu mp r uns when a down function footswitch / switch is d epr es sed, but t a ble top does not move.

Down function shuttle valve is malfunctioning.

Down funct ions reli ef valve i s malfunctioning (popping relief too early).

Motor pump is defe ct ive. Repl ace s us pect m ot or

Wire connections loose. Check all wiring

Check to see if check ball is loose in down function shuttle valve or adjacent elbow (check ball should be held in shuttle valve by metal ring).

Replace suspect down functions relief valve with known wo rk in g rel i ef val ve.

pump with known working motor pu mp.

connec ti on s fr om te rmi na l block to motor pump.

Replace down function shuttle valve. Refer t o para 4.5 .

Replace down functions relief valve. Refer t o para 4.8 .

Repl ace mo tor pu mp. Refer to para 4. 9, an d 4. 10.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

Page 16

SECTION II

Return To Table Of Contents

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

The TABLE D OWN, T ILT DOWN, and BACK DOWN functions do not work, but TABLE UP, TILT UP, and BACK UP functi on s do Conti nue d.

TABLE UP function works, but TABLE D OWN fun ct i on does not or TABLE DOWN function works but TABLE UP function does not. All other functions work.

Motor pu mp d oes no t run when a down f unc ti on i s selected, but runs when an up function is selected.

Motor pump runs but base cylinder solenoid valve does not energize or vice vers a.

Motor pump is defe ct ive. Repl ac e su spe ct m oto r pum p

Wire connections loose. Check al l wiring connections

Subswitch CR1-B of manual functions relay (CR1) is malfunctioning - contacts are stuck open .

TABLE UP / DOWN footswit ch (e s) a re ou t of adjustment.

One of TABLE UP / DOWN footswit ch es i s ma lf unc ti onin g.

with know n work i ng mo tor pump.

from terminal block to motor pump.

Check to see if contacts of subswi tc h N.C. CR1 -B ar e closed when manual function relay (CR1) is not energized. There should be continuity between terminals 2 and 8 of subswi tc h CR1- B wh en CR 1 i s not energized.

Check adjustment of TABLE UP / DOWN foot switc hes.

Perform a continuity check on suspect footsw itch in ON and OFF pos it ion s or re pla ce suspect footswitch with known working footswitch.

Repl ace mo tor pu mp. Refer to para 4. 9, or 4.1 0.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

If th ere i s no c ont inui ty bet ween terminals 2 and 8 of subswitch CR1-B when CR1 is not energized, replace manual function relay (CR1). Refer to para 4.20.

Adjust TABLE UP / DOWN footswitches. Refer to para 4.17.

Replac e foo tswit ch . Refer to para 4.17.

BACK UP functi on wor ks , but BACK DOWN function does not or BACK DOWN function works but BACK UP function does not. All other functions work.

Motor pu mp d oes no t run and back cylinder solenoid valve does not energize.

Motor pump runs but back cylinder solenoid valve does not energize or vice vers a.

Wire connection to footswitch is loose.

BACK UP / DOWN switch is malfunctioning.

Wire connection to BACK UP / DOWN switch is loose.

Check all wiring connections on suspect footswitch.

See Figure 2-2 (page 2-11) for this check. Perfor m a continuity check on BACK UP / DOWN switch as follows: Press BACK UP / DOWN switch to DOWN and then check for continuity across contact points A and B. Press BACK UP / DOWN switch t o UP and then check for continuity across contact points C and D.

Check all wiring connections on suspect BACK UP / DOWN swit c h.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

If continui ty check fails, replace BACK UP / DOWN switch. Refe r to para 4.20.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

Page 17

SECTION II

Return To Table Of Contents

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

BACK UP functi on wor ks , but BACK DOWN function does not or BACK DOWN function works but BACK UP function does not. All other functions work - Continued.

TILT UP funct io n wor k s, but TILT DOWN function does not or TILT DOWN function works bu t TILT UP func tion does not. All other functions work.

Motor pump runs but back cylinder solenoid valve does not energize or vice versa - Continued.

Motor pu mp d oes no t run and tilt cylinder solenoi d valve does not energize.

Motor pump r uns but t il t cylinder solenoid valve does not energize or vice vers a.

BACK UP / DOWN switch is malfunctioning.

TILT UP / DOWN switch is malfunctioning.

Wire connection to TILT UP / DOWN switch is loose.

See Figure 2-2 (page 2-11) for this check. Perfor m a continuity check on TILT UP / DOWN switch as follows: Pre ss T ILT UP / D OWN sw i tch to DOWN and then check for continuity across contact points A and B. Press TILT UP / DOWN switch to UP and then check for continuity across contact points C and D.

Check all wiring connections on suspect TILT UP / DOWN swit c h .

If continui ty check fails, replace BACK UP / DOWN switch. Refe r to para 4.16.

If continui ty check fails, replace TILT UP / DOWN switch. Refer to para 4.16.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

TABLE UP and TABLE DOWN functions do not work. All other functions work.

Motor pu mp r uns when TABLE UP or TABLE DOWN foot pedal is depressed, but table top does not move.

Motor pu mp d oes no t run when TABLE UP or TABLE DOWN foot pedal is depressed.

TILT UP / DOWN switch is malfunctioning.

Base cylinder solenoid valve is malfunctioning.

Wire running from terminal block to base cylinder solenoid valve is broken or disconnected.

White wire which is running to a pole on each footswitch is broken or disconnected.

Check to see if base cylinder solenoid valve energizes (audible cl ick) when TABLE UP or TABLE DOWN footswitch is depressed.

Check continuity of wire and connec t io n s.

Check continuity of white wire and connections.

If continui ty check fails, replace TILT UP / DOWN switch. Refer to para 4.16.

Replace base cylinder. Refer to para 4.14.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

Page 18

SECTION II

Return To Table Of Contents

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

BACK UP and BACK DOWN functions do not work. Al l ot he r fu nct io ns work.

TILT UP and TILT DOWN functions do not work. All other functions work.

Auto return function does not operate properly.

Motor pu mp r uns when BACK UP or BACK DOWN function is selected, but table t o p doe s not move.

Motor pu mp r uns when TI LT UP or TILT DOWN functi on is selected, but table top does not move.

Nothing happens when the AUTO RETURN "RETURN" switch is pressed.

Back cylinder solenoid valve is malfunctioning.

Wire running from terminal block to back cylinder solenoid valve is broken or disconnected.

Tilt cylinder solenoid valve is malfunctioning.

Wire running from terminal block to tilt cylinder solenoid valve is broken or disconnected.

AUTO RETURN "RETURN" switch is malfunctioning.

AUTO RETURN “STOP” switch is malfunctioning stuck open.

Check to see if back cylinder solenoid valve energizes (audible click) when BACK UP or BACK DOWN function is selected.

Check continuity of wire and connec t io n s.

Check to see if tilt cylinder solenoid valve energizes (audible click) when TILT UP or TILT DOWN function is selected.

Check continuity of wire and connec t io n s.

Perform continuity check on AUTO RETURN "RETU RN" swi tch. When swi tc h i s depr ess ed , th er e shoul d be co nti nuit y.

Perform continuity check on AUTO RETURN “STOP” switch . When switch is not depressed, there shoul d be co nti nuit y.

Replace back cylinder. Refer to para 4.12.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

Replace tilt cylinder. Refer to para 4.13.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

Replace AUTO RETURN "RETURN" switch. Refer to para 4.15.

Replace AUTO RETURN “STOP” switch. Refer to para

4.15.

Auto return re lay (CR2) is malfunctioning - not energizing.

Base dow n l imi t swi tch is tripped.

Tilt down limit switch is tripped.

Check to see if auto return relay (CR2) is energizing when AUTO RETURN “RET URN” button is depressed.

Chair is already lowered all the way down, tripping limit switch or base down limit switch is out of adjustment, causing base down limit switch to remain tripped or to trip earlier than desired.

Chair is already lowered all the way down, tripping limit switch or tilt down limit switch is out of adjustment, causing tilt down limit switch to remain tripped or to tr ip earlier than desired.

If auto retur n relay (C R2) will not energize, replace auto return re lay (CR2). Refer to para 4.20.

Adjust base down limit switch. Refer to para 4.22.

Adjust tilt down limit switch. Refer to para 4.21.

Page 19

SECTION II

Return To Table Of Contents

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

Auto return function does not operate properly Conti n ue d .

When the AUTO RETURN "RETURN" switch is pressed, motor pump runs, but ta ble to p do es n ot move.

When the AUTO RETURN "RETURN" switch is pressed, ti lt or base cylinder solenoid valve energizes (audible click), but motor pump does not run.

Subswitch CR2-B of auto return re lay (CR2) is malfunctioning - contacts are stuck open.

Wire connections loose. Check wire connections. Perform

Tilt down limit switch is malfunctioning.

Subswitch CR2-C of auto return re lay (CR2) is malfunctioning - contacts are stuck open.

Check to see if contacts of N.O. subswi tc h CR2- B ar e c los ed wh en auto retur n relay (CR2) i s energized. There should be 115 VAC at terminal 4 of subswitch CR2-B when relay CR2 is energized.

continuity check on wires. Use multimeter to check for proper voltage levels.

When tilt down limit switch is untr ip ped , th er e sh ould be continuity between terminals 3 and 4 of limit switch.

When tilt down limit switch is tripped, there should be continuity between terminals 5 and 6 of limit swit ch.

Check to see if contacts of N.O. subswi tc h CR2- C ar e cl ose d w hen auto retur n relay (CR2) i s energized. There should be 115 VAC at terminal 6 of subswitch CR2-C wh en CR2 i s ener giz ed.

If 115 VAC is not present at terminal 4 of subswitch CR2-B when relay CR2 is energized, replace auto return relay (CR2). Refer to p ara 4.20.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

If th ere i s no c ont inui ty between terminals 3 and 4 of tilt down limit switch when switch is in untripped state, replace tilt down limi t switch. Refer to para 4.21.

If th ere i s no c ont inui ty between terminals 5 and 6 of tilt down limit switch when switch is tripped, replace tilt down li mit sw itc h. Refer t o para 4.21.

If 115 VAC is not present at terminal 6 of subswitch CR2-C when relay CR2 is energized, replace auto return relay (CR2). Refer to p ara 4.20.

Auto re tur n fu nc ti on st op s when operator releases the AUTO RETURN "RETURN" butto n.

One of the two N.C. AUTO RETURN "STOP" switc hes are stuck open.

N.O. subswitch CR2 -A of auto retur n relay (CR2) do es not close.

Wire connections loose. Check wire connections to

Perform continuity check on N.C. AUTO RETURN "STOP" switch. Should be continuity across switch when switch is not depressed.

Perform check on N.O. subswitch CR2-A. There should be 115 VAC at terminal 8 of auto return rel ay (CR2), when AUTO RETURN "RETURN" button is pressed.

terminals 5 and 8 of auto return relay (CR2). Perform continuity check on wires. Use multimeter to check for proper voltage levels.

Replace AUTO RETURN "STOP" switch. Refer to para

4.15.

If 115 VAC is not present at terminal 8 of subswitch CR2-A when relay CR2 is energized, replace auto return relay (CR2). Refer to p ara 4.20.

Clean any dirty connections. Tighten any loose connections. Repl ace a ny da mage d connec ti on s.

Page 20

SECTION II

Return To Table Of Contents

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

Auto return function does not operate properly Conti n ue d .

Motor pump co nti nue s to run a fte r t abl e to p i s completely lowered.

Auto return function does not stop when one of the AUTO RETURN "STOP" buttons are pressed.

Base dow n l imi t swi tch is o ut of adjustment.

Tilt down limit switch is malfunctioning.

Base dow n l imi t swi tch is malfunctioning.

Auto return re lay (CR2) is malfunctioning - stuck in energized position.

The AUTO RETURN "STOP" butto n i s mal fun cti on ing contacts are broken open.

N.O. subswitch CR2 -A of auto retur n relay (CR2) i s stuck closed.

Check ad ju st ment of b as e down limit switch.

See Figure 5-1 for thi s check. There should not be continuity between terminals 7 and 8 of tilt down limit switch when limit switch is tripped.

See Figure 5-1 for thi s check. There should not be continuity between terminals 7 and 8 of base down limit switch when switch when limit switch is tripped.

See Figure 5-1 for thi s check. Perform continuity check on all subswi tc h cont a cts.

Perform continuity check on AUTO RETURN "STOP" butt on.

Perform check on N.O. subswitch CR2-A. There should not be 115 VAC at terminal 8 of auto return relay (CR2) after a STOP button has been pr essed.

Adjust base down limit switch. Refer to para 4.22.

Replace tilt down limit switch. Refer to para 4.21.

Repl ace b ase down l i mit switch. Refer to para 4.22.

Repl ace a uto re tur n r el ay (CR2). Refer to p ara 4.20.

Replace AUTO RETURN "STOP" but ton . Refer to para

4.15.

If 115 VAC is present at terminal 8 of subswitch CR2-A after STOP button has been pressed, replace auto return relay (CR2). Refer to para

4.20.

Any of the three functions drift by themselves.

Back section of table top may be l ifted by hand or tilt function may drift by itself.

Chair functions properly otherwise.

A cylinder solenoid valve is stuck in open position or is malfunctioning.

A footswitch / switch is malfunctioning and holding cylinder sol enoid valve in the open position.

Anti-cavitation solenoid valve is malfunctioning.

Tr y to flush foreign objects out of cylinder sol enoid valve by running oil through cylinder in both directions ten times.

Perform continuity check on suspect function’s footswitch / swit ch.

Replace suspect anti-cavitation solenoid valve with known working anti-cavitation solenoid valve.

Repl ace ma lf unc ti oni ng cylinder assembly.

Repl ace foo tswi tc h or swit ch .

Repl ace a nti - cavi tat io n solenoid valve. Refer to para

4.6.

Page 21

SECTION II

Return To Table Of Contents

TESTING AND TROUBLESHOOTING

Table 2-1. Troubleshooting Guide - Continued

Problem Symptom Probable Cause Check Correction

Chair moves fine for light patient, but will not move or moves slowly for very heavy patient.

Excessive sideways play of chair t op.

Occurs for both the up and down functions.

Occurs for up functions only.

Occurs for down functi ons only.

Chair is not stable and can be moved from side to side.

Hydraulic system is low on miner al oil .

Up functions and down functions relief valves are malfunctioning.

Up functions relief valve is malfunctioning.

Down function relief valve is malfunctioning.

Chain assemblies are loose. Check tension of chain assemblies. Adjust tension of chain

Base slide assembly is worn or deformed.

Check oil level in reservoir. If necessary, add oil to

Repl ace s uspe ct r el ief valv es w ith known wo rk ing rel i ef val ves.

Replace suspect up functions relief valve wi th know n wor ki ng re li ef valv e.

Replace suspect down functions relief valve with known working relief valve.

Check condition of base slide assembly.

reservoir. Refer to para 4.3.

Replace up functions and down functions relief valves. Refer to paras 4.7 and 4.8.

Replace up functions relief valve. Refer t o para 4 .7.

Replace down functions relief valve. Refer t o para 4 .8.

assemblies. Refer to para

4.23.

Repl ace b ase sli de a ss embly. Refer to para 4.2 4.

DOWN

MA290200

Figure 2-2. Continuity Check of Switch

Page 22

SECTION II

Return To Table Of Contents

TESTING AND TROUBLESHOOTING

Page 23

SCHEDULED MAINTENANCE

Return To Table Of Contents

SECTION III

SCHEDULED MAINTENANCE

SECTION III

3.1 Scheduled Maintenance

performed periodically on the chair. These inspections and services should be performed as often as indicated

Table 3-1 is a Scheduled Maintenance Chart which

in the chart.

lists the inspections and services that should be

Table 3-1. Scheduled Maintenance Chart

Interval Inspection or Service What to Do

Semi-annually Obvious damage Visually check condition of chair for obvious damage such as: cracks in components, missing components,

Fasteners / hardware Check chair for missing or loose fasteners / hardware. Replace any missing hardware and tighten any loose

Warning and instructional decals

Pivot points / moving parts / accessories

Hydraulic hoses and fittings Check all hydraulic hoses and fittings for leaks. Replace any components causing leaks. Replace any hose s

Foot control Check that foot control works correctly. Make sure foot pedals contact switches properly. Adjust foot switches if

Hydraulic functions Check that all three functions operate properly. If not, refer to the Troubleshooting Guide to determine the cause

dents in components, leaking oil , or any other visible damage which woul d cause chair to be unsafe to operate or would compromise its performance. Repair chair as necessary.

hardware as necessary.

Check for missing or illegible decals. Replace decals as necessary.

Lubricate al l exposed pivot points, moving parts, and accessories with silicone based lubricant.

which have kinks, cuts, holes, or other damage.

necessary. Refer to para 4.17.

of the problem. Clean or replace components as necessary.

Cylinders Inspect all cylinders for signs of internal leaking or for weak operation. Replace cylinders as necessary.

Drift in chair Check each cylinder to see if it drift s. Replace cylinder if necessary.

Oil level Check oil level in motor pump. Add oil to motor pump if necessary. Refer to para 4.3.

Excessive sideways play of chair top

Anti- cavi ta ti on so le noi d valv e

Auto retu rn fun cti on Check bot h AUTO RETURN "RE TURN" bu tton s and both AUTO RETURN "STOP" but ton s for p rop er op erat ion.

Upholstery Check al l upholstery for r ips, tears, or excessive wear. Replace cushions as necessary.

Reclining arm Check reclining arm for proper operation. Make sure retaining plunger hold reclining arm in position when used.

Foot section brake Check to see if brake for foot section assembly is locking and releasing correctly. Replace

Accessori es Check that all accessories have all of their components and that they function properly. If necessary, repair or

Operational Test Perform an Operational Test to determine if the chair is operating within its speci fications (Refer to para 2.1).

Check that chair top does not have excessive side pl ay. Adjust chain assembly if necessary. Refer to para 4.23.

Check to see if back section may be lifted by hand or if the tilt function drifts by itself. If so, replace anticavitation solenoid valve. Refer to para 4.6.

If necessary, replace buttons. Refer to para 4.15. Check that the auto return function operates properly.

Repai r as ne cess ar y.

brake if necessary.

replace the accessory.

Replace or adjust any malfunctioning components.

Page 24

SECTION III

Return To Table Of Contents

SCHEDULED MAINTENANCE

Page 25

MAINTENANCE / SERVICE INSTRUCTIONS

Return To Table Of Contents

4.1 Introduction WARNING

Refer to the Operator Manual for complete instructions on operating the

chair. Failure to do so could result in personal injury.

NOTE

Perform an operational test on the chair after the repair is completed to confirm the repair was properly made and that

The following paragraphs contain removal, installation, repair, and adjustment procedures for the chair.

4.2 Motor Cover Assembly Removal /

Installation

all

malfunctions were repaired.

SECTION IV

MAINTENANCE / SERVICE

SECTION IV

A. Removal

WARNING

Always disconnect the power cord

from the wall outlet before removing any of the chair's covers / shrouds or making any repairs to prevent the possibility of electrical shock. Failure to comply with these instructions could result in severe personal injury or death.

(1 ) Unplug power cord from wall outlet. (2 ) Remove six screws (1, Figure 4-1) and motor

cover assembly (2) from back outer shroud (3).

B. Installation

(1 ) Install motor cover assembly (2) against back

outer shroud (3) and secure with six screws (1), making sure top edge of motor cover assembly is inserted behind lip (A) of back outer shroud.

(2 ) Plug power cord into wall outlet.

MA421100

Figure 4-1. Motor Cover Assembly

Removal / Installation

4.3 Checking / Adding Oil To Motor Pump

A. Checking / Adding Oil

(1 ) Move the TABLE DOWN, BACK DOWN, and

TILT DOWN functions all the way down.

(2 ) Remove motor cover assembly (Refer to para

4.2).

(3 ) Remove filler cap (1, Figure 4-2) from motor

pump (2).

NOTE

Newer models do not have oil level check hole (A) or screw (3). Check oil level thru fill port.

(4 ) Remove screw (3) and gasket (4) from motor

pump (2).

(5) Check oil level. If oil level in reservoir is not

even with oil level check hole (A), oil must be added.

Page 26

SECTION IV

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MAINTENANCE / SERVICE

4.4 Up Functions Shuttle Valve Removal / Installation

A. Removal

WARNING

Always disconnect the power cord

(1) Unplug power cord from wall outlet. (2) Remove motor cover (Refer to para 4.2).

NOTE

The up functions shuttle valve is lower than the oil level in the motor pump reservoir and oil will flow out of the up functions shuttle valve once the hose assembly is disconnected.

(3) Place drain pan (A) under up functions shuttle

valve (1, Figure 4-3).

MA421200

Figure 4-2. Checking / Adding Oil To Motor Pump

(6) Place a rag under oil level check hole (A).

EQUIPMENT ALERT

Hydraulic system is designed for use with light grade mineral oil only. Failure to

comply could result in hydraulic system failure.

(7) Add oil to fill hole (B) until oil starts to run out of

oil level check hole (A).

(8) Install gasket (4) and screw (3) on motor

pump (2).

(4) Disconnect hose assembly (2) from elbow (B)

of up functions shuttle valve (1).

(5) Remove up functions shuttle valve (1) from

motor pump (3).

B. Installation

(1) Coat two o-rings (C) on up functions shuttle

valve (1) with mineral oil or vaseline.

(2) Install up functions shuttle valve (1) in motor

pump (3).

(3) Connect hose assembly (2) to elbow (B) of up

functions shuttle valve (1).

(9) Install filler cap (1) on motor pump (2).

(10) Move each function to its up and down limit

several times. Then repeat steps 1 thru 9.

(11) Install motor cover assembly (Refer to

para 4.2).

(4) If necessary, add oil to motor pump (Refer to

para 4.3).

(5) Install motor cover assembly (Refer to

para 4.2).

(6) Plug power cord into wall outlet.

(12) Dispose of used oil in accordance with local

regulations.

Page 27

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SECTION IV

MAINTENANCE / SERVICE

NOTE

The down functions shuttle valve is slightly lower

than the oil level in the motor pump reservoir and oil will flow out of the down functions shuttle valve once the hose assembly is disconnected.

(3) Place rags or drain pan (A) under down func-

tions shuttle valve (1, Figure 4-4).

Figure 4-3. Up Functions Shuttle Valve

Removal / Installation

(7) Dispose of used oil in accordance with local

regulations.

MA423600

4.5 Down Functions Shuttle Valve Removal / Installation

A. Removal

WARNING

Always disconnect the power cord

(1) Unplug power cord from wall outlet. (2) Remove motor cover assembly (Refer to para

4.2).

Figure 4-4 Down Functions Shuttle Valve

Removal / Installation

(4) Using a wrench to hold male connector (2)

stationary, loosen jam nut (B) of elbow (3). Disconnect elbow from male connector.

(5) Remove elbow (3) from down function shuttle

valve (1).

(6) Remove down functions shuttle valve (1) from

motor pump (4).

MA290700

Page 28

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MAINTENANCE / SERVICE

B. Installation

NOTE

The down functions shuttle valve is sent from factory with an elbow installed on it. Remove it per step 1.

(1) Remove elbow from down function shuttle

valve (1). Discard elbow.

(2) Coat two o-rings on down functions shuttle

valve (1) with mineral oil or vaseline.

(3) Install down functions shuttle valve (1) in motor

pump (4).

(4) Coat threads of male connector (2) and elbow

(3) with pipe thread tape or sealant.

(5) Install elbow (3) on down functions shuttle

valve (1).

(6) Connect elbow (3) to male connector (2) and

secure by tightening jam nut (B).

(7) If necessary, add oil to motor pump (Refer to

para 4.3).

(8) Install motor cover assembly (Refer to

para 4.2).

(9) Plug power cord into wall outlet.

(10) Dispose of used oil in accordance with local

regulations.

4.6 Anti-Cavitation Solenoid Valve Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove motor cover assembly (Refer to

para 4.2).

(3) Remove two screws (1, Figure 4-5) and control

cover (2) from control panel (3).

(4) Loosen two terminal screws (A); then tag and

disconnect anti-cavitation solenoid valve wires (4) from terminal block (5).

Figure 4-5 Anti-cavitation Solenoid Valve

(5) Pull anti-cavitation solenoid valve wires (4) out

(6) Disconnect hose assembly (6) from elbow (7). (7) Using a wrench to hold male connector (8)

(8) Remove elbow (7) and male connector (8) from

B. Installation

Removal / Installation

thru wire hole (B).

stationary, loosen jam nut (C) of elbow (9). Disconnect male connector from elbow (9).

anti-cavitation solenoid valve (10).

MA290900

EQUIPMENT ALERT

Do not coat last two threads of

elbow (7) and male connector (8) with teflon tape or sealant. Otherwise, little particles of the tape / sealant can break loose and can contaminate hydraulic system.

(1) Coat threads of elbow (7) and male connector

(8) with pipe thread tape or sealant.

Page 29

(2) Install elbow (7) and male connector (8) on anti-

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cavitation solenoid valve (10). (3) Connect hose assembly (6) to elbow (7). (4) Coat threads of male connector (8) with pipe

thread tape or sealant.

SECTION IV

MAINTENANCE / SERVICE

(5) Connect elbow (9) to male connector (8) and

secure by tightening jam nut. (6) Feed two anti-cavitation solenoid valve wires

(4) thru wire hole (B). (7) Connect two anti-cavitation solenoid valve

wires (4) to terminal block (5) and secure by

tightening two terminal screws (A). (8) Install control cover (2) on control panel (3) and

secure with two screws (1). (9) Install motor cover assembly (Refer to

para 4.2).

(10) Plug power cord into wall outlet.

4.7 Up Functions Relief Valve Removal / Installation

A. Removal

(1) If possible, raise TABLE UP function all the

way up.

(2) Unplug power cord from wall outlet. (3) Remove motor cover assembly (Refer to

para 4.2).

(4) Remove four screws (1, Figure 4-6) and back

outer shroud (2) from left and right hand outer shrouds (3).

NOTE

The back inner shroud must be removed if it will obstruct removal of up functions relief valve.

(5) If necessary, remove eight screws (4) and back

inner shroud (5) from left and right hand inner shrouds (6).

Figure 4-6. Up Functions Relief Valve

Removal / Installation

NOTE

Oil will flow out of relief valve port when up functions relief valve is removed. Either have the new up functions relief valve ready to install or place a drain pan under relief valve port to catch oil.

MA421300

Page 30

SECTION IV

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MAINTENANCE / SERVICE

(6) Remove up functions relief valve (7) from motor

pump (8).

B. Installation

(1) Coat two o-rings (A) on up functions relief

valve (7) with mineral oil or vaseline.

EQUIPMENT ALERT

Make sure relief valve (B) has "600"

stamped on its hex head; it stamped "L2". Failure to install proper relief valve will result in faulty table performance.

(2) Install up functions relief valve (7) in motor

pump (8).

(3) If removed, install back inner shroud (5) on left

and right inner shrouds (6) and secure with eight screws (4).

(4) Install back outer shroud (2) on left and right

hand outer shrouds (3) and secure with four screws (1).

must not

NOTE

The back inner shroud must be removed if it will obstruct removal of down functions relief valve.

(4) If necessary, remove eight screws (4) and back

inner shroud (5) from left and right hand inner shrouds (6).

(5) If necessary, add oil to motor pump (Refer to

para 4.3).

(6) Install motor cover assembly (Refer to

para 4.2). (7) Plug power cord into wall outlet. (8) Dispose of used oil in accordance with local

regulations.

4.8 Down Functions Relief Valve Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove motor cover assembly (Refer to

para 4.2).

(3) Remove four screws (1, Figure 4-7) and back

outer shroud (2) from left and right hand outer shrouds (3).

MA421400

Figure 4-7. Down Functions Relief Valve

Removal / Installation

Page 31

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MAINTENANCE / SERVICE

NOTE

Oil will flow out of relief valve port when down functions relief valve is removed. Either have the new down functions relief valve ready to install or place a drain pan under relief valve port to catch oil.

(5) Remove down functions relief valve (7) from

motor pump (8).

B. Installation

(1) Coat two o-rings (A) on down functions relief

valve (7) with mineral oil or vaseline.

EQUIPMENT ALERT

Make sure relief valve (B) has "L2"

stamped on its hex head; it stamped "600". Failure to install proper relief valve will result in faulty table performance.

(2) Install down functions relief valve (7) in motor

pump (8).

(3) If removed, install back inner shroud (5) on left

and right inner shrouds (6) and secure with eight screws (4).

must not

4.9 Motor Pump Assembly - Complete Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove motor cover (Refer to para 4.2). (3) Remove four screws (1, Figure 4-8) and back

outer shroud (2) from left and right hand outer shrouds (3).

(4) Remove two screws (4) and control cover (5)

from control panel (6).

(5) Loosen three terminal screws (A); then tag and

disconnect three motor pump wires (7) from terminal block (8).

(6) Pull motor pump wires (7) out thru wire hole

(B).

(7) Loosen two terminal screws; then tag and

disconnect anti-cavitation solenoid valve wires (9) from terminal block (8).

(4) Install back outer shroud (2) on left and right

hand outer shrouds (3) and secure with four screws (1).

(5) If necessary, add oil to motor pump (Refer to

para 4.3). (6) Install motor cover (Refer to para 4.2). (7) Plug power cord into wall outlet. (8) Dispose of used oil in accordance with local

regulations.

(8) Pull anti-cavitation solenoid valve wires (9) out

thru wire hole (B).

(9) Remove four nuts (10) from four motor

mounts (11).

(10) Disconnect hose assembly (12) from male

elbow (13). (11) Place a drain pan under elbow (14). (12) Disconnect hose assembly (15) from elbow

(14). Allow oil to drain into drain pan. (13) Remove motor pump assembly (16) from four

motor mounts (11).

Page 32

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MAINTENANCE / SERVICE

Figure 4-8. Motor Pump Assembly - Complete Removal / Installation

B. Installation

(1) Install motor pump assembly (16) on four motor

mounts (11) and secure with four nuts (10).

7 9

(8) Install control cover (5) on control panel (6) and

secure with two screws (4).

MA421500

(2) Connect hose assembly (15) to elbow (14). (3) Connect hose assembly (12) to male el-

bow (13).

(4) Feed two anti-cavitation solenoid valve wires

(9) thru wire hole (B).

(5) Connect two anti-cavitation solenoid valve

wires (9) to terminal block (8) and secure by tightening two terminal screws (A).

(6) Feed three motor pump wires (7) thru wire hole

(B).

(7) Connect three motor pump wires (7) to terminal

block (8) and secure by tightening three terminal screws.

(9) Install back outer shroud (2) on left and right

hand outer shrouds (3) and secure with four

screws (1). (10) Add oil to motor pump (Refer to para 4.3). (11) Install motor cover assembly (Refer to

para 4.2). (12) Plug power cord into wall outlet. (13) Dispose of used oil in accordance with local

regulations.

Page 33

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MAINTENANCE / SERVICE

4.10 Motor Pump Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove motor pump assembly - Complete

(Refer to para 4.9).

(3) Remove filler cap (A) and drain any remaining

oil into drain pan (See Figure 4-9).

(4) Using a wrench to hold male connector (1,

Figure 4-12) stationary, loosen jam nut (B) of elbow (2). Disconnect male connector (1) of anti-cavitation solenoid valve (C) from elbow (2).

(5) Remove down functions shuttle valve (3) and

up functions shuttle valve (4) from motor pump (5).

(6) Remove two screws (6), lockwashers (7), and

motor base (8) from motor pump (5).

B. Installation

(1) Install motor base (8) on motor pump (5) and

secure with two lockwashers (7) and

screws (6).

(2) Coat o-rings of up functions shuttle valve (4)

and down functions shuttle valve (3) with

mineral oil or vaseline.

(3) Install up functions shuttle valve (4) and down

functions shuttle valve (3) on motor pump (5).

(4) Coat threads of male connector (1) with pipe

thread tape or sealant.

(5) Connect male connector (1) of anti-cavitation

solenoid valve (C) to elbow (2) and secure by

tightening jam nut (B).

(6) Install motor pump assembly (Refer to

para 4.11).

Figure 4-9. Motor Pump Removal / Installation

MA291400

(7) Plug power cord into wall outlet.

4.11 Motor Shaft Seal Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove motor pump (Refer to para 4.10).

NOTE

Reservoir is difficult to remove. Use a screwdriver to pry reservoir off of manifold block, but make sure not to damage o-ring (A).

(3) Remove four screws (1, Figure 4-11) and

reservoir (2) from manifold block (3).

(4) Remove magnet (4) from strainer (5).

Page 34

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MAINTENANCE / SERVICE

MA291500

Figure 4-10. Motor Shaft Seal

Removal / Installation

(5) Remove four screws (6) and pump housing (7)

from manifold block (3).

(6) Remove pump gear (8) and woodruff key (9)

from shaft of rotor assembly (10).

(7) Remove four screws (11) and motor housing

(12) from manifold block (3).

(8) Push rotor assembly (10) inward toward

manifold block (3); then remove retaining ring (13) from end of rotor assembly shaft.

(9) Remove rotor assembly (10) from manifold

block (3).

(10) Using a screwdriver, pry motor shaft seal (14)

out of manifold block (3).

B. Installation

(1) Clean all metal shavings off of all components. (2) Coat new motor shaft seal (14) with vaseline or

mineral oil.

EQUIPMENT ALERT

Do not allow motor shaft seal (B) to become cocked during installation or it will

become impossible to install without damaging it.

(3) Using a hammer and 3/4 inch socket, install

motor shaft seal (14) in manifold block (3).

(4) Slide shaft of rotor assembly (10) thru manifold

block (3) and secure in place by installing retaining ring (13) on end of rotor assembly shaft.

Page 35

(5) Install motor housing (12) on manifold block (3)

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and secure with four screws (11).

(6) Install woodruff key (9) and pump gear (8) on

shaft of rotor assembly (10).

SECTION IV

MAINTENANCE / SERVICE

(10) Install reservoir (2) on manifold block (3) and

secure with four screws (1).

(11) Install motor pump (Refer to para 4.13). (12) Plug power cord into wall outlet.

(7) Install pump housing (7) on manifold block (3)

and secure with four screws (6). (8) Install magnet (4) on strainer (5). (9) Make sure o-ring (A) on manifold block is

present and clean. Coat o-ring with mineral oil.

NOTE

Strainer (5) may get in way when reservoir is being installed. If so, rotate strainer out of the way.

4.12 Back Cylinder Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove four screws (1, Figure 4-11) and front

outer shroud (2) from left and right hand outer shrouds (3).

(3) Remove eight screws (4) and front inner shroud

(5) from left and right hand inner shrouds (6).

(4) Remove screw (7) and wire clip (8) securing

wires and hoses to base weldment (9).

(5) Remove motor cover assembly (Refer to

para 4.2).

(6) Remove two screws (1, Figure 4-12) and

control cover (2) from control panel (3).

Figure 4-11. Table Access

MA291700

MA421600

Figure 4-12. Back Cylinder Wires

Disconnection / Connection

Page 36

SECTION IV

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MAINTENANCE / SERVICE

(7) Loosen two terminal screws (A); then tag and

disconnect back cylinder wires (4) from terminal

block (5). (8) Pull back cylinder wires (4) out wire hole (B). (9) Remove locking knob (1, Figure 4-13) from

back weldment (2).

(13) Tag hose assemblies (5 and 6). (14) Disconnect hose assembly (5) from back

cylinder (7).

(15) Disconnect hose assembly (6) from back

cylinder (7).

(16) Cut necessary cable ties (A) and remove back

cylinder (7) from chair.

B. Installation

NOTE

No sealant is required when connecting hose assemblies. The back cylinder has an o-ring in each port which seals the hose assemblies.

(1) Connect hose assembly (6, Figure 4-13) to

back cylinder (7).

(2) Connect hose assembly (5) to back cylin-

der (7).

MA291800

Figure 4-13. Back Cylinder Removal / Installation

(10) Remove four screws (3) and back cover (4)

from back weldment (2).

(11) Cut two cable ties (A) which are securing hose

assemblies (5 and 6) to back cylinder (7).

(12) While supporting back weldment (2), remove

four E-rings (8), two clevis pins (9), and partially

separate back cylinder (7) from cylinder

brackets (10). Fold back section over onto seat

section.

(3) Install back cylinder (7) on cylinder brackets

(10) and secure with two clevis pins (9) and four E-rings (8).

(4) Secure hose assemblies (5 and 6) to back

cylinder (7) with two cable ties (A).

(5) Route back cylinder wires (4, Figure 4-12) thru

chair. (6) Feed back cylinder wires (4) thru wire hole (B). (7) Connect two back cylinder wires (4) to terminal

block (5) and secure by tightening two terminal

screws (A). (8) Re-secure back cylinder wire harness as

necessary with cable ties (B). (9) Install control cover (2) on control panel (3) and

secure with two or six screws (1).

(10) Secure wires and hoses to base weldment (9,

Figure 4-11) with wire clip (8) and screw (7).

Install any cable ties removed during removal.

(11) Install front inner shroud (5) on left and right

hand outer shrouds (6) and secure with eight

screws (4).

Page 37

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MAINTENANCE / SERVICE

(12) Install front outer shroud (2) on left and right

hand inner shrouds (3) and secure with four screws (1).

(13) Make sure strain relief bushing (10) is installed

in front outer shroud (2). (14) Plug power cord into wall outlet. (15) Lower TILT DOWN function all the way down. (16) Lower BACK DOWN function all the way down.

EQUIPMENT ALERT

TILT DOWN function must be completely lowered for following step. Failure to do

so will result in incorrect adjustment.

(17) If back section

BACK DOWN function is completely lowered,

perform steps 18 thru 20. If back section

level when the BACK DOWN function is

completely lowered, go to step 21. See Figure

4-13.

is not

level with floor when the

4.13 Tilt Cylinder Removal / Installation

A. Removal

(1) If possible, lower TILT DOWN function all the

way down. (2) Unplug power cord from wall outlet. (3) Remove motor cover assembly (Refer to

para 4.2). (4) Remove two screws (1, Figure 4-14) and

control cover (2) from control panel (3).

EQUIPMENT ALERT

The cylinder rod (B) must be partially ex-

tended before performing step 19. If the cylinder rod is fully extended or retracted when step 19 is being performed, damage to seals will occur.

(18) Raise BACK UP function up until cylinder rod is

extended halfway.

(19) Place a wrench on adjusting seats (C) of

cylinder rod and use it to rotate cylinder rod to adjust clevis (D) up or down as necessary. See Figure 4-16.

(20) Repeat steps 16 thru 19 until back section is

level when BACK DOWN function is completely lowered.

(21) Install back cover (4, Figure 4-13) on back

weldment (2) and secure with four screws (3). (22) Install locking knob (1) on back weldment (2). (23) If necessary, add oil to motor pump (Refer to

para 4.3). (24) Install motor cover assembly (Refer to

para 4.2).

MA292000

Figure 4-14. Tilt Cylinder Wire

Disconnection / Connection

(5) Loosen two terminal screws (A) ; then tag and

disconnect two tilt cylinder wires (4) from

terminal block (5). (6) Pull tilt cylinder wires (4) out thru wire hole (B). (7) Remove four screws (1, Figure 4-15) and front

outer shroud (2) from left and right hand outer

shrouds (3).

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MAINTENANCE / SERVICE

(11) Cut cable ties (A)which secure hose assem-

blies and wire harnesses to tilt cylinder (8).

WARNING

The foot end of table top must be

supported while removing tilt cylinder. Failure to do will allow table top to fall which could result in serious personal injury.

NOTE

Cut cable ties (A) as required to remove tilt cylinder.

(12) While supporting foot end of table top, remove

four E-rings (10), two clevis pins (11), and tilt cylinder (8) from brackets (12).

B. Installation

(1) Install tilt cylinder (8, Figure 4-15) on brackets

(12) and secure with two clevis pins (11) and four E-rings (10).

power manifolds. Failure to do so could result in serious personal injury to patient or operator.

(2) Connect power manifold (9) to base of tilt

(3) Connect return manifold (7) to rod end of tilt

WARNING

Make sure the safety cable (B) is

properly installed on the return and

cylinder (8).

Figure 4-15. Tilt Cylinder Removal / Installation

(8) Remove eight screws (4) and front inner shroud

(5) from left and right hand inner shrouds (6).

(9) Disconnect return manifold (7) from rod end of

tilt cylinder (8).

(10) Disconnect power manifold (9) from base of tilt

cylinder (8).

MA421700

(4) Secure wire harnesses and hose assemblies to

tilt cylinder (8) with cable ties (A).

(5) Route tilt cylinder wires (4, Figure 4-14) thru

table.

(6) Feed tilt cylinder wires (4) thru wire hole (B) in

control panel (3).

(7) Connect two tilt cylinder wires (4) to terminal

block (5) and secure by tightening two terminal screws (A).

(8) Install control cover (2) on control panel (3) and

secure with two or six screws (1).

Page 39

SECTION IV

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MAINTENANCE / SERVICE

(9) Install any cable ties (A) which were removed. (10) Plug power cord into wall outlet. (11) Lower TILT DOWN function all the way down. (12) If seat section

TILT DOWN function is completely lowered, perform steps 13 thru 15. If seat section is level when the TILT DOWN function is completely lowered, go to step 16.

is not

level with floor when the

EQUIPMENT ALERT

The cylinder rod (C) must be partially ex-

tended before performing step 14. If the cylinder rod is fully extended or retracted when step 14 is being performed, damage to seals will occur.

(13) Raise TILT UP function up until cylinder rod (C)

is extended halfway.

(14) Place a wrench on adjusting seats (D) of

cylinder rod and use it to rotate cylinder rod to adjust clevis (E) up or down as necessary. See Figure 4-19.

4.14 Base Cylinder Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove motor cover assembly (Refer to

para 4.2).

(3) Remove four screws (1, Figure 4-16) and back

outer shroud (2) from left and right hand outer shrouds (3).

(4) Remove eight screws (4) and back inner

shroud (5) from left and right hand inner shrouds (6).

(5) Remove four screws (7) and brace (8) from

base slide assembly (9).

(6) Plug power cord into wall outlet.

(15) Repeat steps 11 thru 14 until seat section is

level when TILT DOWN function is completely lowered.

(16) Install front inner shroud (5, Figure 4-19) on left

and right hand inner shrouds (6) and secure with eight screws (4).

(17) Install front outer shroud (2) on left and right

hand outer shrouds (3) and secure with four screws (1).

(18) Make sure strain relief bushing (13) is installed

on front outer shroud (2).

(19) If necessary, add oil to motor pump (Refer to

para 4.3).

(20) Install motor cover assembly (Refer to

para 4.2).

Figure 4-16. Base Cylinder Access

MA421800

Page 40

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MAINTENANCE / SERVICE

(7) If TABLE DOWN function is operable, place a

block under middle slide of base slide assembly (9). Then lower the TABLE DOWN function until the middle slide of the base slide assembly is resting on block (A) and pressure is off clevis pin (10). If TABLE DOWN function is not operable, move table top to a horizontal position and place supports under each end of table.

(8) Remove two screws (1, Figure 4-17) and

control cover (2) from control panel (3).

MA292300

Figure 4-17. Base Cylinder Wires

Disconnection / Connection

(9) Loosen two terminal screws(A); then tag and

disconnect base cylinder wires (4) from terminal block (5).

(10) Pull base cylinder wires (4) out wire hole (B).

Figure 4-18. Base Cylinder Removal / Installation

(11) Remove hitch pin clip (1, Figure 4-18) and

clevis pin (2) from rod end of base cylinder (3).

(12) Remove hitch pin clip (4), clevis pin (5), and

partially separate base cylinder (3) from brackets (6).

(13) Cut two cable ties (A) securing hose assembly

(7) to base cylinder (3).

(14) Disconnect hose assembly (7) from base

cylinder (3).

MA421900

WARNING

Make sure table top is properly

secured from lowering or tipping over when base cylinder is disconnected from table top. Clevis pin (2, Figure 4-18) should not have any weight on it if table top is supported properly. Failure to have table top properly secured could result in serious personal injury or death.

(15) Place rags under base tee (8).

NOTE

When base tee is disconnected from base cylinder, oil will be free to flow out of the motor pump thru the base tee. Either be ready to install the new base cylinder or have drain pan and rags ready to catch the oil.

Page 41

(16) Disconnect base tee (8) from base cylinder (3).

Return To Table Of Contents

Remove base cylinder from table.

B. Installation

SECTION IV

MAINTENANCE / SERVICE

(1) Position base cylinder (3, Figure 4-18) on table. (2) Connect base tee (8) to base cylinder (3). (3) Connect hose assembly (7) to base cylin-

der (3).

(4) Secure hose assembly (7) to base cylinder (3)

with two cable ties (A).

(5) Install base cylinder (3) on brackets (6) and

secure with clevis pins (2 and 5) and hitch pin clips (1 and 4).

(6) Feed base cylinder wires (4, Figure 4-17) thru

wire hole (B).

(7) Connect two base cylinder wires (4) to terminal

block (5) and secure by tightening two terminal screws (A).

(8) Install control cover (2) on control panel (3) and

secure with two or six screws (1).

(9) Plug power cord into wall outlet.

(10) See Figure 4-16. Raise TABLE UP function

slightly and remove block (A) from under middle slide of base slide assembly (9) or remove supports from under table top.

(11) Lower TABLE DOWN function all the way

down.

(12) See Figure 4-19. If there

inch (1.6 to 3.2 mm) gap (A) between inner member weldment (B) and top of middle slide (C) when the TABLE DOWN function is completely lowered (it is especially important that the inner member weldment does not come into contact with the top of the middle slide), perform steps 13 thru 15. If gap is correct when the TABLE DOWN function is completely lowered, go to step 16.

is not

a 1/16 to 1/8

MA292501

Figure 4-19. Base Cylinder Clevis Adjustment

EQUIPMENT ALERT

The cylinder rod (D) must be partially ex-

tended before performing step 14. If the cylinder rod is fully extended or retracted when step 14 is being performed, damage to seals will occur.

(13) Raise TABLE UP function up until cylinder rod

(D) is extended halfway.

(14) Place a wrench on adjusting seats (E) of

cylinder rod and use it to rotate cylinder rod to adjust clevis (F) up or down as necessary.

Page 42

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MAINTENANCE / SERVICE

(15) Repeat steps 11 thru 14 until there is a 1/16 to

1/8 inch (1.6 to 3.2 mm) gap (A) between inner member weldment (B) and middle slide (C) of base slide assembly when the TABLE DOWN function is completely lowered.

(16) Install brace (8, Figure 4-16) on base slide

assembly (9) and secure with four screws (7).

(17) Install any cable ties removed during removal.

(18) Install back inner shroud (5) on left and right

hand inner shrouds (6) and secure with eight screws (4).

(19) Install back outer shroud (2) on left and right

hand outer shrouds (3) and secure with four screws (1).

(20) If necessary, add oil to motor pump (Refer to

para 4.3).

(21) Install motor cover assembly (Refer to

para 4.2).

4.15 AUTO RETURN "RETURN" or "STOP" Switch Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove six screws (1, Figure 4-20) and

separate switch plate (2) from seat weldment (3).

MA292601

Figure 4-20. AUTO RETURN "RETURN" or "STOP"

Switch Removal / Installation

(2) Connect two wires (4) to terminals of "RE-

TURN" (A) or "STOP" (B) switch (5).

(3) Install switch plate (2) on seat weldment (3)

and secure with six screws (1).

(4) Plug power cord into wall outlet.

(3) Disconnect two wires (4) from "RETURN" (A)

or "STOP" (B) switch (5).

(4) Depress four tabs (C) of "RETURN" or "STOP"

switch (5), while simultaneously pulling the switch out of switch plate (2).

B. Installation

(1) Push "RETURN" (A) or "STOP" (B) switch (5)

into switch plate (2) until it "pops" into place.

4.16 BACK UP / DOWN or TILT UP / DOWN Switch Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove six screws (1, Figure 4-21) and

separate switch plate (2) from seat weldment (3).

(3) Disconnect six wires (4) from switch (5).

Page 43

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TABLE

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SECTION IV

MAINTENANCE / SERVICE

4.17 TABLE UP or TABLE DOWN Switches Removal / Installation / Adjustment

A. Removal

MA292701

Figure 4-21. BACK UP / DOWN (A) or TILT UP /

DOWN (B) Switch Removal / Installation

(4) Depress four tabs (C) of switch (5), while

simultaneously pulling the switch out of switch plate (2).

(1) Unplug power cord from wall outlet.

NOTE

The procedure & illustration describes the removal / installation of the TABLE UP switches (A). Removal of the TABLE DOWN switches (B) is the same.

(2) Remove screw (1, Figure 4-22), lockwasher

(2), and foot pedal (3) from foot control housing (4).

B. Installation

(1) Push switch (5) into switch plate (2) until it

"pops" into place. (2) Connect six wires (4) to terminals of switch (5). (3) Install switch plate (2) on seat weldment (3)

and secure with six screws (1). (4) Plug power cord into wall outlet.

Figure 4-22. TABLE UP or TABLE DOWN Switches

Removal / Installation / Adjustment

MA292801

Page 44

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MAINTENANCE / SERVICE

NOTE

The inside switch is the switch that activates the base cylinder solenoid valve while the outside switch is the switch which activates the motor pump. This is true for both the TABLE UP (A) and the TABLE DOWN (B) sets of switches.

(3 ) Remove locknut (5), screw (6), three insulators

(7), and two switches (8) from mounting

plate (9).

(4 ) Disconnect two wires (10) from switch (8) being

removed.

B. Installation / Adjustment

NOTE

If adjusting switches only, perform steps 1 and 2 of removal and then steps 2 thru 11 of installation / adjustment

(1) Connect two wires (10) to terminals of switch

(8).

(2 ) Unscrew setscrew (11) as far as it will go

without removing it.

(9 ) Observe. A light touch should cause the motor

pump to activate followed closely by the base cylinder solenoid valve. If adjustment is necessary, go to step 10.

NOTE

Tightening setscrew will cause the base cylinder solenoid valve to activate sooner.

(1 0) Tighten setscrew (11) approximately 1/4 turn at

a time.

(1 1 ) Repeat steps 8 thru 10 until inner switch is

adjusted properly.

4.18 Time Delay Relay Removal / Installation

EQUIPMENT ALERT

Put a multimeter in line w/time delay relay

and run each cylinder one at a time. A reading >1.2 amps indicates a malfunctioning cylinder. Replace the cylinder before replacing the relay. Failure to do so will result in damage to new relay.

A. Removal

NOTE

Make sure the inside switch is pushed down as far as it will go before tightening locknut (5). This is necessary because the inside switch must be down all the way so it can be adjusted properly.

(3 ) Install switches (8) on mounting plate (9) and

secure with three insulators (7), screw (6), and locknut (5), making sure outside switch is secured by tab of mounting plate.

(4 ) Ensure springs (12) are in position and have not

fallen off.

(5 ) Install foot pedal (3) on foot control housing (4)

and secure with lockwasher (2) and screw (1), making sure pivot tab (C) of foot pedal is inserted in pivot socket (D) of foot control housing.

(6) Tighten setscrew (11) just until it comes into

contact with inside switch (8). (7 ) Plug power cord into wall outlet. (8 ) Slowly depress foot pedal to activate function

which needs adjustment and observe.

(1 ) Unplug power cord from wall outlet. (2 ) Remove motor cover assembly (Refer to para

4.2).

(3 ) Remove two screws (1, Figure 4-23) and control

cover (2) from control panel (3).

(4 ) Tag and disconnect two wires (4) from terminals

of time delay relay (5).

(5 ) Remove nut (6), screw (7), washer (8), and time

delay relay (5) from control panel (3).

B. Installation

(1 ) Install time delay relay (5) on control panel (3)

and secure with washer (8), screw (7), and nut (6).

(2 ) Connect two wires (4) to terminals of time delay

relay (5).

(3 ) Install control cover (2) on control panel (3) and

secure with two screws (1).

Page 45

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MAINTENANCE / SERVICE

MA292900

Figure 4-23. Time Delay Relay

Removal / Installation

(4 ) Install motor cover assembly (Refer to

para 4.2).

(5 ) Plug power cord into wall outlet.

4.19 Capacitors Removal / Installation

A. Removal

(1 ) Unplug power cord from wall outlet. (2 ) Remove four screws (1, Figure 4-24) and front

outer shroud (2) from left and right hand outer shrouds (3).

(3) If necessary to gain access to capacitors,

remove eight screws (4) and front inner shroud

(5) from left and right hand inner shrouds (6). (4 ) Cut cable tie (A) securing wires to capacitor (7). (5 ) Using a screwdriver, pry tab (B) of capacitor

mounting bracket (8) upward and remove

capacitor (7) from capacitor mounting bracket. (6 ) Remove capacitor cap (9) from capacitor (7).

MA422000

Figure 4-24. Capacitors Removal / Installation

WARNING

A capacitor contains stored electricity.

Never touch terminals of a capacitor, even if power has been shut off or disconnected. Always discharge capacitor before touching capacitor terminals or wires. Failure to comply with these instruction could result in serious personal injury or death.

Page 46

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MAINTENANCE / SERVICE

(7) Discharge capacitor (7). (8) Disconnect wires (10 and 11) from terminals of

capacitor (7).

(9) Using a screwdriver, pry tab (B) of capacitor

mounting bracket (12) upward and remove capacitor (13) from capacitor mounting bracket.

(10) Remove capacitor cap (14) from capaci-

tor (13).

WARNING

A capacitor contains stored electricity.

(11) Discharge capacitor (13). (12) Disconnect wires (11 and 15) from terminals of

capacitor (13).

B. Installation

(8) If removed, install front inner shroud (5) on left

and right hand inner shrouds (6) and secure with eight screws (4).

(9) Install front outer shroud (2) on left and right

hand outer shrouds (3) and secure with four screws (1).

(10) Make sure strain relief bushing (16) is installed

in front outer shroud (2).

(11) Plug power cord into wall outlet.

4.20 Auto Return Relay [CR2] or Manual Functions Relay [CR1] Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove motor cover assembly (Refer to

para 4.2).

(3) Remove two screws (1, Figure 4-25) and

control cover (2) from control panel (3).

(1) Connect capacitor wires (11 and 15) to termi-

nals of capacitor (13). (2) Install capacitor cap (14) on capacitor (13). (3) Position bottom of capacitor (13) on capacitor

mounting bracket (12) and then push the top of

the capacitor in. Using a screwdriver, force tab

(B) of capacitor mounting bracket (12) down

over catch (C). (4) Connect capacitor wires (10 and 11) to termi-

nals of capacitor (7). (5) Install capacitor cap (9) on capacitor (7). (6) Position bottom of capacitor (7) on capacitor

mounting bracket (8) and then push the top of

the capacitor in. Using a screwdriver, force tab

(B) of capacitor mounting bracket (8) down over

catch (C). (7) Install cable tie to secure wire to capacitor (7).

MA293101

Figure 4-25. Auto Return Relay [CR2] or Manual

Functions Relay [CR1] Removal / Installation

Page 47

(4) Tag and disconnect eight wires (4) from relay

Return To Table Of Contents

[CR1] (A) or [CR2] (B/5). (5) Remove two nuts (6), screws (7), and relay

[CR1] (A) or [CR2] (B/5) from control panel (3).

SECTION IV

MAINTENANCE / SERVICE

B. Installation

(1) Install relay [CR1] (A) or [CR2] (B/5) on control

panel (3) and secure with two screws (7) and

nuts (6). (2) Connect eight wires (4) to relay [CR1] (A) or

[CR2] (B/5). (3) Install control cover (2) on control panel (3) and

secure with two screws (1). (4) Install motor cover assembly (Refer to

para 4.2). (5) Plug power cord into wall outlet.

4.21 Tilt Down Limit Switch Removal / Installation

A. Removal

(1) Unplug power cord from wall outlet.

(2) Remove four screws (1, Figure 4-26) and front

outer shroud (2) from left and right hand outer shrouds (3)

(3) Remove eight screws (4) and front inner shroud

(5) from left and right hand inner shrouds (6).

(4) Remove nut (7), lockwasher (8), and tilt down

limit switch (9) from inner member (10).

(5) Tag and disconnect five wires (11) from termi-

nals of tilt down limit switch (9).

B. Installation / Adjustment

NOTE

If performing adjustment only, perform steps 1 thru 3 of removal and then perform steps 4 thru 12 of installation / adjustment.

MA422100

Figure 4-26. Tilt Down Limit Switch

Removal / Installation

(1) Connect five wires (11) to terminals of tilt down

limit switch (9).

(2) Screw nut (12) all the way on tilt down limit

switch (9).

(3) Install tilt down limit switch (9) on inner member

(10) and secure with lockwasher (8) and nut (7).

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MAINTENANCE / SERVICE

(4) Plug power cord into wall outlet. (5) Run TILT DOWN function all the way down. (6) If seat weldment is level with top of inner

member, no adjustment is necessary. Go to step 10. If seat weldment is not level with top of inner member, adjustment is necessary. Go to step 7.

(7) Raise TILT UP function all the way up. (8) Loosen nut (7). Then adjust nut (12) as

deemed necessary. Then tighten nut (7).

(9) Repeat steps 5 thru 8 until seat weldment is

level with top of inner member when TILT DOWN function is all the way down.

(10) Install front inner shroud (5) on left and right

hand inner shrouds (6) and secure with eight screws (4).

(11) Install front outer shroud (2) on left and right

hand outer shrouds (3) and secure with four screws (1).

(12) Make sure strain relief bushing (13) is installed

on front outer shroud (2).

4.22 Base Down Limit Switch Removal / Installation / Adjustment

A. Removal

(1) Unplug power cord from wall outlet. (2) Remove four screws (1, Figure 4-27) and front

outer shroud (2) from left and right hand outer shrouds (3).

(3) Remove eight screws (4) and front inner shroud

(5) from left and right hand inner shrouds (6).

(4) Tag and disconnect four wires (7) from termi-

nals of base down limit switch (8).

Figure 4-27. Base Down Limit Switch

Removal / Installation / Adjustment

B. Installation

(1) Install base down limit switch (8) on auto return

bracket (12) and secure with two screws (11), lockwashers (10), and two nuts (9).

MA422200

(5) Remove two nuts (9), lockwashers (10), screws

(11), and base down limit switch (8) from auto return bracket (12).

(2) Connect four wires (7) to terminals of base

down limit switch (8).

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C. Adjustment

(1) If base down limit switch was not replaced and

is only being adjusted, perform steps 1 thru 3 of removal to gain access to base down limit switch.

NOTE

If the motor pump continues to run after the AUTO RETURN function has lowered the table top all the way down, the base down limit switch must be adjusted so its trip arm (A) contacts the trip plate before the table top is completely lowered.

(2) Loosen two nuts (9) and adjust base down limit

switch (8) as necessary so trip arm (A) of base down limit switch is getting tripped by trip plate just before the AUTO RETURN function lowers the table top all the way down.

WARNING

Do not touch any bare wires or electri-

cal shock could occur. Do not place hands or head inside base area of table while it is being lowered. Failure to follow these safety precautions could result in serious personal injury or death.

4.23 Chain Assembly Adjustment

A. Adjustment

(1) Raise TABLE UP function all the way up. (2) Unplug power cord from wall outlet. (3) Remove four screws (1, Figure 4-28) and front

outer shroud (2) from left and right hand outer shrouds (3).

(3) Plug power cord into wall outlet. (4) Raise TABLE UP function all the way up. (5) Press AUTO RETURN "RETURN" button. (6) If the motor pump automatically shuts off when

AUTO RETURN function stops, base down limit switch is adjusted properly. If the motor pump continues to run after table top is completely lowered, repeat steps 2 thru 6 again.

(7) Install front inner shroud (5) on left and right

hand inner shrouds (6) and secure with eight screws (4).

(8) Install front outer shroud (2) on left and right

hand outer shrouds (3) and secure with four screws (1).

(9) Make sure strain relief bushing (13) is installed

on front outer shroud (2).

MA422300

Figure 4-28. Chain Assembly Adjustment

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MAINTENANCE / SERVICE

(4) Remove eight screws (4) and front inner shroud

(5) from left and right hand inner shrouds (6).

(5) Loosen four screws (7).

EQUIPMENT ALERT

Adjust chains so they are tight, yet

have a slight spring back. Also, adjust chains so there is an equal amount of tension on each chain. Failure to do so will result in chains loosening earlier and uneven wear.

(6) Insert a pry bar or large screwdriver into

adjustment gap (A) and pry downward on idler adjustment weldment (8) until chains (9) are tight, but not drum tight. Tighten four screws (7).

(7) Install front inner shroud (5) on left and right

hand inner shrouds (6) and secure with eight screws (4).

(8) Install front outer shroud (2) on left and right

hand outer shrouds (3) and secure with four screws (1).

MA422400

Figure 4-29. Shrouds Removal / Installation

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MAINTENANCE / SERVICE

(9) Plug power cord into wall outlet.

(10) Make sure strain relief bushing (10) is installed

on front outer shroud (2).

4.24 Base Slide Assembly Removal / Installation

A. Removal

(1) If possible, raise TABLE UP function all the

way up.

(2) Move the back and seat sections of the table

top to a horizontal position.

(3) Unplug power cord from wall outlet. (4) Remove motor cover assembly (Refer to

para 4.2).

(5) Remove four screws (1, Figure 4-29) and back

outer shroud (2) from left and right hand outer shrouds (3).

(6) Remove eight screws (4) and back inner

shroud (5) from left and right hand inner shrouds (6).

(7) Remove four screws (7) and front outer shroud

(8) from left and right hand outer shrouds (3).

(8) Remove eight screws (9) and front inner shroud

(10) from left and right hand inner shrouds (6).

(9) Remove six screws (11), washers (12), and left

and right hand inner shrouds (6) from base slide assembly (13).

(10) Remove six screws (14) and partially separate

left and right hand outer shrouds (3) from base weldment (15).

WARNING

The supports must be capable of

holding up table top after table top is disconnected from base slide assembly and the base slide assembly is removed. Failure to support table top properly could result in table top falling out-of-control which could result in serious personal injury or death.

(11) Place supports (A, Figure 4-30) under seat

section (B) and back section (C) of table top, making sure weight of table top is being supported by supports. If necessary, plug power cord into outlet and lower table top onto supports. Unplug power cord from outlet.

(12) Remove two E-rings (1, Figure 4-30), clevis pin

(2), and separate tilt cylinder (3) from bracket (4).

(13) Loosen four setscrews (5). Remove two tilt

pivot pins (6) from base slide assembly (7).

WARNING

Make sure table top is properly sup-

ported for the following step. Table top will rest only on supports after this step. Also do not touch any wires inside of table when power cord is plugged in. This could result in electrical shock. Failure to comply with this warning could result in serious personal injury or death.

(14) Plug power cord into wall outlet. Lower TABLE

DOWN function all the way down. Unplug power cord from wall outlet.

WARNING

Make sure base slide assembly is fully

retracted (collapsed) before disconnecting base cylinder. Failure to do so will result in base slide assembly collapsing after base cylinder is disconnected which could result in serious personal injury.

(15) Remove hitch pin clip (8), clevis pin (9), and

separate rod of base cylinder (10) from

bracket (11). (16) Remove capacitors (D) Refer to para 4.19). (17) Remove five nuts (12), four screws (13), one

screw (14), two capacitor mounting brackets

(15), and partially separate auto return bracket

assembly (16) from base slide assembly (7).

Lay auto return bracket assembly out of the

way on base weldment (17). (18) Disconnect spring (18) from base slide assem-

bly (7).

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Figure 4-30. Base Slide Assembly Removal / Installation

MA293601

Page 53

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MAINTENANCE / SERVICE

(19) Remove eight screws (19) from base slide

assembly (7).

NOTE

If necessary, remove four screws and brace (E) to allow base slide assembly to be pulled over base cylinder.

(20) With the help of an assistant, remove base

slide assembly (7) from base weldment (17).

B. Installation

(1) With the help of an assistant, install base slide

assembly (7, Figure 4-30) on base weldment (17), making sure base cylinder (10) gets inserted between brace (E) and base slide assembly.

(2) Secure base slide assembly (7) on base

weldment (17) with eight screws (19). (3) Connect spring (18) to base slide assembly (7). (4) Install auto return bracket assembly (16) and

two capacitor mounting brackets (15) on base

slide assembly (7) and secure with one screw

(14), four screws (13), and five nuts (12). (5) Install capacitors (Refer to para 4.19). (6) Install rod (F) end of base cylinder (10) on

bracket (11) and secure with clevis pin (9) and

hitch pin clip (8).

NOTE

Install beveled edge of tilt pivot pins first. The beveled edge allows the tilt pivot pins to be started more easily.

(7) Raise TABLE UP function until base slide

assembly (7) is aligned with seat weldment

(20). Secure base slide assembly to seat

weldment with two tilt pivot pins (6).

(8) Secure tilt pivot pins (6) in place by tightening

four setscrews (5).

(9) Install base of tilt cylinder (3) on bracket (4) and

secure with clevis pin (2) and two E-rings (1).

(10) Remove supports (A) from under head section

(11) If necessary, adjust base down limit switch

(Refer to para 4.22).

(12) Install left and right hand outer shrouds (3,

Figure 4-29) on base weldment (15) and secure with six screws (14).

(13) Install left and right hand inner shrouds (6) on

base slide assembly (13) and secure with six washers (12) and screws (11).

(14) Install front inner shroud (10) on left and right

hand inner shrouds (6) and secure with eight screws (9).

(15) Install front outer shroud (8) on left and right

hand outer shrouds (3) and secure with four screws (7).

(16) Install back inner shroud (5) on left and right

hand inner shrouds (6) and secure with eight screws (4).

(17) Install back outer shroud (2) on left and right

hand outer shrouds (3) and secure with four screws (1).

(18) Make sure strain relief bushing (16) is installed

on front outer shroud (8).

(19) Install motor cover assembly (Refer to

para 4.2).

(20) Plug power cord into wall outlet.

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4.25 Reclining Arm Adjustment

A. Adjustment

(1) Raise BACK UP function all the way up.

NOTE

When correctly adjusted, the left and right reclining arms (1) will be level (A) with the seat section and the reclining arms will also be even with each other.

(6) Repeat steps (3) thru (5) for other reclining arm

(2), except, adjust this reclining arm so it is even with first reclining arm adjusted.

4.26 Hydraulic System Flushing Procedure

NOTE

The following procedure is recommended when:

(3) Loosen jam nut (1, Figure 4-31) on reclining

arm (2).

• The hydraulic system is excessively contaminated with dirt particles or water, causing repeated malfunctions of hydraulic components.

• An oil other than light weight mineral oil has been added to the hydraulic system, causing the table to malfunction or perform erratically.

A. Flushing Procedure

(1) Lower TABLE DOWN

DOWN functions all the way down.

(2) Remove motor cover assembly (Refer to

para 4.2).

(3) Remove filler cap (1, Figure 4-32) from reser-

voir (2).

(4) Get a suitable drain pan (C) with a capacity of

approximately 2 quarts (1.9 liters).

(5) Using a syringe or suction device, remove all oil

from the reservoir (2).

, ,

, BACK DOWN

, ,

, and TILT

, ,

Figure 4-31. Reclining Arm Adjustment

(4) Using wrench on adjusting seat (B), adjust

inner rod (3) up or down until reclining arm (2) is level with seat section.

(5) Tighten jam nut (1).

MA422500

(6) Refill reservoir (2) with light grade mineral oil. (7) Disconnect hose (A) from down functions

shuttle valve (3) and place end of hose in drain pan.

(8) Raise TABLE UP

functions all the way up, while making sure to keep refilling reservoir (2) with light grade mineral oil as necessary.

(9) Connect hose (A) to down functions shuttle

valve (3).

, ,

, BACK UP

, ,

, and TILT UP

, ,

Page 55

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MAINTENANCE / SERVICE

Figure 4-32. Hydraulic System Flushing Procedure

(10) Disconnect hose (B) from up functions shuttle

valve (4) and place end of hose in drain pan.

(11) Lower TABLE DOWN

DOWN functions all the way down, while making sure to keep refilling reservoir (2) with light grade mineral oil as necessary.

, ,

, BACK DOWN, and TILT

, ,

is clear and contains no dirt particles.

(14) Run all the functions up and down until all air is

purged from the hydraulic system.

(15) Lower all functions; then check oil level and add

or remove oil as necessary (Refer to para 4.3).

MA422600

(12) Connect hose (B) to up functions shuttle

valve (4).

(13) Repeat steps 7 thru 12 until oil being removed

(16) Install motor cover assembly (Refer to

para 4.2).

(17) Dispose of used oil in accordance with local

regulations.

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MAINTENANCE / SERVICE

Page 57

SCHEMATICS AND DIAGRAMS

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SECTION V

SCHEMATICS AND DIAGRAMS

SECTION V

5.1 Electrical Schematics / Wiring Diagrams

Figures 5-1 and 5-2 illustrate the logic/current flow and

ORANGE

(NC)

BASE DOWN

LIMIT SWITCH

BLACK

(NO)

(NC)

(NO)

(NC)

TILT DOWN

LIMIT SWITCH

BLACK / WHITE

CR1

6 3

WHITE

A 7 4 1

(COM)

WHT/ORG

(COM)

BLACK

(COM)

WHT/ORG

(COM)

BLACK

CR2

4 1

WHITE

WHITE WHITE WHITE WHITE

BACK

SWITCH

DOWN

BACK

SWITCH

RED / BLACK

WHITE

wiring connections between the electrical components in the table.

BLACK

UP UPDOWN

BLACK

TIME DELAY

RELAY

WHITE / BLACK

TERMINAL

BOARD

TILT

SWITCH

UPDOWN UPDOWN

BLUE

TILT

SWITCH

BLUE

WHT/ORG

RED / BLACK

R.H.

STOP

L.H.

STOP

RED

RED / BLACK

AUTO RETURN

SWITCHES

(NC)

RETURN

(NC)

RETURN

(NO)

R.H.

(NO)

L.H.

CAPACITORS

(124 - 149 MFD 330 VAC)

120 V.A.C.

60 HZ. SUPPLY

ANTI-

CAVITATION

SOLENOID

BLACK

WHITE

MOTOR

(T1) YELLOW

(T2) BLUE

(T3) RED

TERMINAL

BOARD

WHITE / BLACK

GREEN

BLACK

5678

10 11

BLACK

RED

ORANGE

GREEN or BLUE

WHITE

Figure 5-1. Wiring Diagram

BLACK

BLUE

BLACK

RED

TILT CYLINDER

BASE CYLINDER

BACK CYLINDER

TABLE DOWN

WHITE

(NO) (NO)

TABLE

FOOTSWITCH

MA288402

WHITE

Page 58

SECTION V

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SCHEMATICS AND DIAGRAMS

120 V.A.C.

12 AMPS 60 HZ.

ANTI-CAVITATION

SOLENIOD VALVE

CR1-A

CR2-C

BACK (R.H.)

BACK (L.H.)

BLACK

CONTROL PANEL SWITCHESFOOT CONTROL FOOT SWITCHES

TILT (R.H.)

(N.0.)

DOWN

CR1-B

(N.C.)

RED / BLACK

WHITE / BLACK

DOWN

GREEN / YELLOW

CAPACITOR(S)

{QUANTITY MAY VARY}

MANUAL FUNCTIONS RELAY

CR1

BACK

CYLINDER

SOLENOID

VALVE

MOTOR

PUMP

TIME DELAY RELAY

WHITE

TABLE DOWN

CR1-C

DOWN

TILT (L.H.)

TABLE UP

(N.C.)

BLUE

BLACK

RED

BLACK

R.H. STOP

R.H. RETURN

(N.O.)

L.H. RETURN

(N.O.)

L.H. STOP

(N.C.)

AUTO RETURN

Figure 5-2. Electrical Schematic

WHT/ORG

(N.O.)

CR2-A

TILT CYLINDER SOLENOID

VALVE

BASE

CYLINDER

(N.O.)

CR2-B

(N.C.)

(N.O.)

(N.C.) (N.C.)

TILT DOWN

LIMIT SWITCH

8787

SOLENOID

VALVE

(N.C.)

BASE DOWN

LIMIT SWITCH

BLK/WHT

CR2

AUTO RETURN

RELAY

MA288500

Page 59

SECTION V

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SCHEMATICS AND DIAGRAMS

5.2 Hydraulic Flow Diagrams

Figure 5-3 illustrates the hydraulic oil flow through the

UP FUNCTIONS HYDRAULIC OIL FLOW

CYLINDER

ROD

BASE

CYLINDER

SOLENOID

VALVE

(OPEN)

CYLINDER

ROD

TILT

CYLINDER

SOLENOID

VALVE

(CLOSED)

chair when an up function is selected. Figure 5-4 illustrates the hydraulic oil flow through the chair when a down function is selected.

CYLINDER

ROD

BACK

CYLINDER

SOLENOID

VALVE

(CLOSED)

ANTI-CAVITATION SOLENOID VALVE

(OPEN)

CHECK VALVE

SUCTION PRESSURE RETURN

RESERVOIR

PORT

(OPEN)

RESERVOIR

(OPEN)

DOWN FUNCTIONS

SHUTTLE VALVE

(CLOSED)

DOWN FUNCTIONS

RELIEF VALVE

(CLOSED)

CHECK

BALL

SHUTTLE

PUMP

GEARS

FILTER

UP FUNCTIONS

SHUTTLE VALVE

(OPEN)

UP FUNCTIONS

RELIEF VALVE

(CLOSED)

RESERVOIR

PORT

(CLOSED)

CHECK

BALL

RESERVOIR

CHECK VALVE

(CLOSED)

RESERVOIR

MA293800

Figure 5-3. Up Functions Hydraulic Flow Diagram

Page 60

SECTION V

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SCHEMATICS AND DIAGRAMS

DOWN FUNCTIONS HYDRAULIC OIL FLOW

ANTI-CAVITATION SOLENOID VALVE

(OPEN)

CYLINDER

ROD

BASE

CYLINDER

SOLENOID

VALVE

(OPEN)

CYLINDER

ROD

TILT

CYLINDER

SOLENOID

VALVE

(CLOSED)

DOWN FUNCTIONS

SHUTTLE VALVE

(OPEN)

CHECK

BALL

SHUTTLE

CYLINDER

ROD

BACK CYLINDER SOLENOID

VALVE

(CLOSED)

UP FUNCTIONS

SHUTTLE VALVE

(CLOSED)

RESERVOIR

PORT

(OPEN)

PUMP

GEARS

CHECK

BALL

RESERVOIR

PORT

(CLOSED)

RESERVOIR

CHECK VALVE

(OPEN)

RESERVOIR

MA293700

SUCTION PRESSURE RETURN

RESERVOIR

CHECK VALVE

(CLOSED)

DOWN FUNCTIONS

RELIEF VALVE

(CLOSED)

FILTER

UP FUNCTIONS

RELIEF VALVE

(CLOSED)

Figure 5-4. Down Functions Hydraulic Flow Diagram

Page 61

SECTION VI

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PAR TS LIST

6.1 Introduction

The illustrated parts list provides information for identifying and ordering the parts necessary to maintain the unit in peak operating condition. Refer to paragraph 1.5 for parts ordering information.

The parts list also illustrates disassembly and assembly relationships of parts.

6.2 Description of Columns

The

Item

column of the parts list gives a component its own unique number. The same number is given to the component in the parts illustration. This allows a part number of a component to be found if the technician can visually spot the part on the illustration. The technician simply finds the component in question on the illustration and notes the item number of that component. Then, he finds that item number in the parts list. The row corresponding to the item number gives the technician the part number, a description of the component, and quantity of parts per subassembly. Also, if a part number is known, the location of that component can be determined by looking for the item number of the component on the illustration.

The

Part No.

for that component.

column lists the MIDMARK part number

SECTION VI

PARTS LIST

The

Description

of the component. The

Qty.

component that is required for the subassembly. The letters “AR” denote “as required” when quantities of a particular component cannot be determined, such as: adhesive.

Bullets [ • ] in the column show the indenture level of a component. If a component does not have a bullet, it is a main component of that illustration. If a component has a bullet, it is a subcomponent of the next component listed higher in the parts list than itself that does not have a bullet. Likewise, if a component has two bullets, it is a subcomponent of the next component listed higher in the parts list than itself that has only one bullet.

column provides a physical description

column lists the number of units of a particular

Part No.

column and the

Description

6.3 Torque Specifications and Important Assembly Notes

When specific assembly torque specifications, measurements, or procedures have been identified, by our engineering department, as required to assure proper function of the unit, those torque specifications measurements, and procedures will be noted on the parts illustrations. Adherence to these requirements is essential.

Page 62

Pictorial Index

Return To Table Of Contents

SECTION VI

PARTS LIST

Used on units with Serial Numbers KM-1000 thru Present

Item Part No. Description Page

1 • • Back and Seat Components ............. 6-3

2 • • Leg Components .............................. 6-4

3 • • Upholstery Set ................................. 6-5

4 • • Base Cover and Enclosures............. 6-6

5 • • Base Mechanical Components ......... 6-7

6 • • Hydraulic System ............................. 6-8

7 • • Base Slide Assembly........................ 6-9

8 • • Base Electrical Comp.-Domestic .... 6-10

9 • • Motor / Pump Components ............. 6-11

10 • • Control Panel Assembly ................. 6-12

317 Power Podiatry Table

Always Specify Model & Serial Number

MA288200

Item Part No. Description Page

OPTIONAL ACCESSORIES

Refer to MEDICAL ACCESSORY BOOK {004-0096-00}

11 • 9A6400X • Vision Block Screen ...................... 9A64

12 • 9A75001 • Caster Base Assembly ................. 9A75

13 • 9A83001 • Instrument Tray ............................ 9A83

14 • 9A18400X • Base Rail Kit ................................ 9A184

15 • 9A197001 • Swivel Wheel Caster Accessory . 9A197 16 • 003-0906-00 • Installation & Operation Manual

(Not Shown).................................... N/S

Page 63

Back and Seat Components

Return To Table Of Contents

SECTION VI

PARTS LIST

Used on units with Serial Numbers KM-1000 thru KM-1571

1 030-0300-00 Reclining Arm - R.H. (Shown)................ 1

2 030-0300-02 Reclining Arm - L.H. (Opposite) ............. 1

3 041-0375-02 Jam Nut ................................................ 2

4 057-0120-00 Inner Rod .............................................. 2

5 042-0014-03 Shoulder Screw..................................... 2

6 016-0335-00 Spring Plunger....................................... 2

7 030-0322-00 Outer Arm Weldment - R.H. (Shown)..... 1

030-0322-02 Outer Arm Weldment - L.H. (Opposite).. 1

8 053-0115-01 Rectangular Plug................................... 4

9 016-0131-02 Bushing ................................................. 4

10 040-0250-05 Set Screw ............................................. 4

11 051-0271-00 Arm Stop ............................................... 2

12 030-0297-40 Back Weldment ..................................... 1

13 050-0907-00 Spacer .................................................. 1

14 042-0045-01 Nutsert.................................................. 4

15 051-0264-00 Guide Bar.............................................. 2

16 045-0001-13 Spring Washer ...................................... 4

17 051-0808-00 Headrest Bar.......................................... 1

18 050-0908-00 Lock Plate ............................................. 1

19 040-0250-33 Screw ................................................... 4

20 016-0175-00 Knob ..................................................... 1

21 040-0010-28 Screw ................................................... 4

22 053-0147-02 Back Cover........................................... 1

23 042-0007-00 E-Ring................................................... 4

Always Specify Model & Serial Number

MA287800

Item Part No. Description Qty.Item Part No. Description Qty.

24 042-0006-00 Clevis Pin .............................................. 1

25 Back Cylinder (Refer to "Hydraulic

System" Elsewhere) .............................. 1

26 042-0006-01 Clevis Pin .............................................. 1

27 015-0082-02 Grounding Braid .................................... 1

28 040-0250-88 Screw ................................................... 6

29 040-0010-04 Screw ................................................... 1

30 045-0001-05 Lockwasher .......................................... 1

31 045-0001-31 Lockwasher .......................................... 1

32 050-3504-40 Seat Cover............................................ 1

33 040-0010-47 Screw ................................................... 5

34 050-3596-30 Switchplate............................................ 1

061-0613-01 Switch Label - L.H. (Not Shown)............ 1

35 040-0008-28 Screw ................................................. 12

36 042-0045-02 Nutsert ................................................ 12

37 015-0001-02 Wire Clip................................................ 1

38 030-0999-40 Seat Weldment ...................................... 1

39 015-0408-00 Rocker Switch........................................ 4

40 015-0376-00 Stop Switch ............................................ 2

41 015-0424-00 Auto Return Switch................................. 2

42 050-3596-30 Switchplate............................................ 1

061-0613-00 Switch Label - R.H. (Not Shown) ........... 1

43 053-0068-06 Snap Bushing ........................................ 4

44 053-0068-08 Snap Bushing ........................................ 2

Page 64

Back and Seat Components

Return To Table Of Contents

SECTION VI

PARTS LIST

Used on units with Serial Numbers KM-1572 thru Present

1 030-0300-00 Reclining Arm - R.H. (Shown)................ 1

2 030-0300-02 Reclining Arm - L.H. (Opposite) ............. 1

3 041-0375-02 Jam Nut ................................................ 2

4 057-0120-00 Inner Rod .............................................. 2

5 042-0014-03 Shoulder Screw..................................... 2

6 016-0335-00 Spring Plunger....................................... 2

7 030-0322-00 Outer Arm Weldment - R.H. (Shown)..... 1

030-0322-02 Outer Arm Weldment - L.H. (Opposite).. 1

8 053-0115-01 Rectangular Plug................................... 4

9 016-0131-02 Bushing ................................................. 4

10 040-0250-05 Set Screw ............................................. 4

11 051-0271-00 Arm Stop ............................................... 2

12 030-1390-40 Back Weldment ..................................... 1