Knight Smart Cart User manual

Smart Cart
Operation Manual
THIS MANUAL CONTAINS IMPORTANT INFORMATION REGARDING INSTALLATION, SAFETY, MAINTENANCE,
AND OPERATION OF THE KNIGHT GLOBAL SERVO CART AND SHOULD BE AVAILABLE TO ALL PERSONNEL.
RESPONSIBLE FOR USING THE CART.
REV: 020-202201

KNIGHT SMART CART LIFT ASSIST OPERATION MANUAL
This manual provides important information for all personnel involved in the installation, operation
and maintenance of the Knight Global Smart Cart. All personnel must read this document before
operating the equipment.
Every effort has been made to provide complete and accurate product information in this manual.
However, due to product improvements and changes, discrepancies and omissions may be
present. Visit our website at www.knight-ind.com for the updated information on all our products.
It is the responsibility of the end user to exercise common sense and judgment when performing
the tasks described in this manual. If any procedure seems inaccurate, incomplete or unsafe
please put the equipment in a safe condition and contact Knight Global service department for
assistance. Knight service department’s phone number is: [phone].
Throughout this manual there are steps and procedures that if not performed correctly can result
in personal injury or equipment damage. The following signal words are used to identify the level
of potential hazard.
WARNING
Indicates a hazard which will cause severe injury, death or substantial
equipment damage.
CAUTION
Indicates a hazard which can or will cause injury or equipment damage.
NOTE
Notifies personnel of installation, operation or maintenance information
which is important but not hazard related.

KNIGHT SMART CART OPERATION MANUAL
i
TABLE OF CONTENTS
1. SAFETY........................................................................................................................................................1
A. General Safety Precautions ...................................................................................................................2
Basic Safety Procedures.....................................................................................................................2
Lithium-Ion Battery and Charging Safety Precautions:.......................................................................2
B. Safety Devices .......................................................................................................................................3
Motor Holding Brake ...........................................................................................................................3
Overload Capacity Protection .............................................................................................................3
Safety Drop Stop (SDS) Chain ...........................................................................................................3
2. INSTALLATION ...........................................................................................................................................5
A. Introduction.............................................................................................................................................6
B. General Operation..................................................................................................................................7
Step 1: Control Handle Set-up...........................................................................................................8
Step 1a) Analog Lever Handle Setup: .......................................................................................8
Step 1b) Discrete Up / Down Handle setup:..............................................................................8
Step 2: Test Cart Movement..............................................................................................................9
Step 3: Sequence of Operation..........................................................................................................9
3. OPERATION...............................................................................................................................................10
A. Principle of Operation...........................................................................................................................10
Smart Cart Control Configurations....................................................................................................10
B. Smart Cart Functionality Modes...........................................................................................................11
Shut Down.........................................................................................................................................11
Start Up.............................................................................................................................................11
Work Mode........................................................................................................................................11
Travel Limits......................................................................................................................................11
Fault Mode........................................................................................................................................11
4. MAINTENANCE .........................................................................................................................................12
A. CHAIN INSPECTION...........................................................................................................................12
4.1 Inspection Overview....................................................................................................................12
4.2 Use of LIFT Safely in Any Application ........................................................................................13
4.3 Determining the Frequency of Chain Inspections.......................................................................14
4.3.1 Service Rating Load Criteria............................................................................................14
4.3.2 Service Class (Duty Cycle)..............................................................................................14
4.4 Type of Inspections.....................................................................................................................15
4.4.1 Frequent Inspection (Visual)............................................................................................15
4.4.1.1 What to Look for During a Frequent Inspection...............................................15
4.4.2 Periodic Inspection (Documented)...................................................................................16
4.4.2.1 Recommendations for Periodic Inspections ....................................................16
4.4.2.2 Recommended Record Keeping for Periodic Inspections...............................20
4.4.3 Chain Lubrication:............................................................................................................21
4.4.4 Load Chain Replacement: ...............................................................................................21
B. PREVENTATIVE MAINTENANCE FOR KNIGHT SMART CART.......................................................22
4.5 Smart Carts Inspections..............................................................................................................22
4.5.1 Recommendations for Frequent Inspections for Smart Carts (Visual)............................22
4.5.2 Periodic Inspection (Documented)...................................................................................23
4.6 Load and Safety Drop Stop Chain Replacement (Normal Maintenance)...................................26
4.7 Broken Chain Replacement........................................................................................................30
5. ELECTRICAL INFORMATION...................................................................................................................34
A. CHARGING THE BATTERY:...............................................................................................................34
B. LITHIUM-ION BATTERY:.....................................................................................................................35
C. DC-MOTOR CONTROLLER INFORMATION .....................................................................................36
6. TROUBLESHOOTING CHART..................................................................................................................38
7. SPARE PARTS LIST .................................................................................................................................40
8. DECOMMISSIONING OF A SMART CART ..............................................................................................40

KNIGHT SMART CART OPERATION MANUAL
ii
TABLE OF CONTENTS
9. KNIGHT’S PERFORMANCE WARRANTY...............................................................................................41
10. APPENDIX A: USB LOCATION IN SMART CART MANUAL.................................................................42
11. APPENDIX B: EMENTOOL LITE V1.0: PROGRAMMING SOFTWARE ...............................................43
12. APPENDIX C: EM-243C-JS1 DC-MOTOR CONTROLLER.....................................................................45

KNIGHT SMART CART OPERATION MANUAL
SECTION 1
SAFETY
1
1. SAFETY
Knight Global cannot be aware of or provide for all the procedures by which the Smart Cart operations or
repairs may be conducted and the hazards which may result from each method. If operation or maintenance
not specifically recommended by Knight Global is conducted, it must be ensured that product or personnel
safety is not endangered by these actions. If not sure of an operation or maintenance procedure or step,
personnel should place the Smart Cart in a safe condition and contact a supervisor and/or Knight Global’s
service department for technical support. Modifications to upgrade, re-rate or otherwise alter this equipment
shall be authorized only by the original equipment manufacturer.
If a below-the-hook lifting device or sling is used with the Smart Cart, refer to ANSI/ASME B30.9 “Safety
Standard for Slings”, or ANSI/ASME B30.20 “Safety Standard for Below-the-Hook Lifting Devices”.
Electrical equipment described in this manual are designed and built-in compliance with ANSI/NFPA 70,
“National Electrical Code”. It is the responsibility of the system designer, system manufacturer, crane or rail
manufacturer, installer, and user to ensure that the installation and associated wiring of the Smart Cart and
components are in compliance with ANSI/NFPA 70, and all applicable Federal, State and Local Codes.
Hazardous voltages are present in the Smart Cart and components. Only properly trained and competent
personnel should perform inspections or repairs on the Smart Cart or accessories. Prior to performing any
maintenance (mechanical or electrical) on the Smart Cart, de-energize (disconnect) the main switch supplying
power to the Smart Cart. Lock out the power supply following standard plant procedures.
Ensure that the installation, inspection, testing, maintenance and operation are in compliance with
ANSI/ASME B30.16 “Safety Standard for Overhead Carts”, OSHA Regulations, ANSI/NFPA 70, National
Electric Code, and applicable ANSI/ASME standards.This is the responsibility of the owner/operator.
All personnel that will install, operate, inspect, test or maintain the cart should read this manual and be
familiar with all applicable portions of the referenced standards.
If clarification of any information in this manual or additional information is required, contact Knight Global.
Do not install, operate, inspect, test or maintain the cart unless all information is understood.

KNIGHT SMART CART OPERATION MANUAL
SECTION 1
SAFETY
2
A. General Safety Precautions
NOTE
Read all technical manuals/directions provided with the product before
attempting to operate or perform service/maintenance on any part of
the system.
Although the procedures covered in this manual have proven to be safe in use, Knight Global assumes no
responsibility for personal injury or damage to the equipment resulting from their application.
WARNING
It is not possible to cover all safety conditions in this manual. Therefore,
always be alert and work safely.
Basic Safety Procedures
Although the procedures covered in this manual have proven to be safe in use, Knight Global assumes no
responsibility for personal injury or damage to the equipment resulting from their application. It is not possible
to cover all safety conditions in this manual. Therefore, always be alert and work safely.
!Follow all applicable Federal, State, Local or Company policies or regulations
!Do not overload the Smart Cart, this could damage the cart.
!Do not let loads significantly over hang the sides of the platform; this could cause the Smart Cart
to tip over.
!Lock the wheels when leaving the cart unattended.
!Do not move the Smart Cart with the load in the uppermost position.
!Do not use the Smart Cart if any damage is evident.
Lithium-Ion Battery and Charging Safety Precautions:
!Do not short circuit the battery.
!Do not drop, throw or crush the battery.
!Keep battery away from heat sources, high voltage, and other high-temperature sources.
!Never smoke or allow an open flame in the vicinity of the battery.
!Do not leave the battery exposed to sunlight for extended periods of time.
!Do not attempt to dissemble the battery.
!Do not connect to the battery in reverse polarity.
!Do not use charger with a two bladed adapter plug or extension cord. Doing so can result in serious
personal injury.

KNIGHT SMART CART OPERATION MANUAL
SECTION 1
SAFETY
3
B. Safety Devices
Motor Holding Brake
A motor holding braking system engages and holds the vertical axis in place when power is removed from the
cart or in the event of a power outage.The motor holding break is also engaged when there the chain is not
moving.
Overload Capacity Protection
Protects the equipment and prevents the operator from lifting or moving more weight than the system is rated
for. If the load weight causes the cart to draw more amps then the programmed current limit, the cart will not
lift any further until the excess load is removed. Downward motion is permitted when overloaded to allow the
user to safely set the weight back down on a stable surface.
Safety Drop Stop (SDS) Chain
All Standard units have a Safety Drop Stop (SDS) chain included. The SDS Chain moves up and down the
vertical axis with the load chain. It provides load stabilization in the event of a catastrophic load chain failure.
This unique feature has a US Patent NO. 10,099,904 awarded as of 2018.

KNIGHT SMART CART OPERATION MANUAL
SECTION 1
SAFETY
4

KNIGHT SMART CART OPERATION MANUAL
SECTION 2
INSTALLATION
5
2. INSTALLATION
Prior to installation, visually inspect the Smart Cart for signs of damage or missing parts.
CAUTION
Knight Global recommends the use of Demag Chain Grease.
The part number of the Demag Chain grease tube is 665 009 44.
If Demag Chain Grease is not available, SAE 50 to 90 EP oil or equivalent
may be used.
Follow the procedure detailed in section 4.4.3 “Chain Lubrication”
of this manual.
CAUTION
Prior to placing this unit into service, the owners and user are advised
to examine specific local and/or other regulations, including ANSI and
OSHA regulations that may apply to the use of this product.
WARNING
A falling load can cause injury or death. Before installing this cart read
the “Safety” section of this manual.
Follow all procedures in this section for installation and set-up of the Smart Cart.
Retain all product information supplied with the Smart Cart for future reference.
When installation is complete and prior to placing the Smart Cart into operation, inspect the Smart Cart
following the instructions in section 4.4.2.1 “Recommendations for Periodic Inspections” of the “Maintenance”
portion of this manual.

KNIGHT SMART CART OPERATION MANUAL
SECTION 2
INSTALLATION
6
A. Introduction
Prior to installing and operating the Knight Smart Cart, all operators using this device should be familiar with
the main components of the lifting system. (Refer to Figure 2-1)
Smart Cart: The Smart Cart assembly is a powered lifting device. The upper drive assembly contains the
servo motor with holding brake, gearbox and chain bucket. The lower controls box contains the 24 VDC
power supply and AC Plug and charger.
Control Handle: The main interface between the operator and the lifting device.
Foot Brake: Prevents the cart from moving unintentionally.
Figure 2-1
•This ergonomic lift cart is designed to assist the operator when lifting heavy loads up to 400 lbs.
•The lift assist system consists of a stabilizing cart and a fixture attached to a vertical mast.
•The fixture travels along the rail on the cart’s load trolley, enabling the system to move vertically.
•The optional custom fixture holds the part or tool while it is being manipulated.
•Control handles are used to guide the load vertically and move the cart within your facility.
System functionality are activated through the control handles.
Motor, Gear box
and Chain bucket
Vertical
Mast
Foot
Brake
Controls
Enclosure
Control
Handle

KNIGHT SMART CART OPERATION MANUAL
SECTION 2
INSTALLATION
7
B. General Operation
Figure 2-2
Power UP/DOWN
Power is controlled by the ON/OFF toggle switch. Move the toggle switch to the ON position to
power up the Smart Cart. Move the toggle switch to the OFF position to power down the Smart
Cart. (Refer to Figure 2-2)
Foot Brake
A brake is located in the center of the frame or on each castor depending on the design.
Press down on the lever to set the brake.
Control Handle
The control handle can be adjusted to a comfortable working height by loosening the two (2)
adjustment collars, moving the handle to the proper location and then retightening the
adjustment collars.
Lift Control
The position of the platform or end effector is controlled with either a Right/Left analog lever or
a digital Up/Down pushbutton located on the control handle.
Breaker
The breaker acts as overload/over travel protection.
The breaker will trip if the Smart Cart is used to lift a load that is beyond its capacity.
The breaker will trip if the upper or lower limit switch is bypassed, the lift is in the fully up or
down position and the UP or DOWN button is held in the ON position.
Lastly, the breaker will trip if the speed control senses the motor draws more than 40Amps.
Linked or
Roller
Chain
Front
Support
Legs
Fixture
Trolley
Upper
Limit
Switch
Lower
Limit
Switch
Control
Handle
Power
Switch
Foot Brake
Location

KNIGHT SMART CART OPERATION MANUAL
SECTION 2
INSTALLATION
8
Step 1: Control Handle Set-up
There are (2) two control handle configurations. This section discusses the correct setup of each of these.
1a) Analog Lever Handle setup
1b) Discrete Up / Down Handle setup
Step 1a) Analog Lever Handle Setup:
1) The Analog Lever Handle comes standard with the system. (Refer to Figure 2-3)
2) If a new Analog Lever Handle has to be calibrated for the system, please follow these steps:
i. Attached the 8-pin cable to the new handle and mount it to the cart’s handle post.
ii. Remove the Control Box’s cover.
iii. Press the Blue button located on the left-hand side of the battery. It will light up.
iv. Press the Analog Lever fully to the Right.
v. Press the Analog Lever fully to the Left.
vi. Allow the Analog Lever to “rest” in its natural home position without moving it.
vii. The Blue light will flash indicating that the new Analog Lever Handle has been
calibrated.
Figure 2-3
Step 1b) Discrete Up / Down Handle setup:
1) This handle is not standard with a new system. If one is required, please contact Knight personnel
for instructions on how to calibrate the digital Up / Down handle.
8-pin Cable
Analog
Thumb
Lever

KNIGHT SMART CART OPERATION MANUAL
SECTION 2
INSTALLATION
9
Step 2: Test Cart Movement
Test the Smart Cart movement by moving the analog thumb lever on the control handle to the right and left.
The fixture should move upward and downward freely. The speed of the movement will be directly
proportional to the amount the thumb lever is moved past its center or rest position.
Step 3: Sequence of Operation
NOTE
As required, engage/disengage the caster brakes to prevent the cart from
movement.
1. Position cart until the fixture is at a proper height to engage the part by use of the UP/DOWN
control pendant. If necessary, engage the foot brake to prevent the cart from moving.
2. Ensure that cart has engaged part properly and transfer part to drop-off position.
Note: If the foot brake was engaged in step 1, release the brake before moving the cart.
3. Use the thumb lever to position part at a proper height for the drop-off location.
4. Unload the part from cart. If necessary, engage the foot brake to prevent the cart from moving.
5. Remove fixture from drop-off location and return to starting location.
Note: If the foot brake was engaged in step 4, release the brake before moving the cart.
6. Repeat operation.

KNIGHT SMART CART OPERATION MANUAL
SECTION 3
OPERATION
10
3. OPERATION
A. Principle of Operation
The Smart Cart system receives a command to move up or down along the “Z” axis by pressing the analog
thumb lever right and left. (Refer to Figure 3-1)
Smart Cart Control Configurations
Figure 3- 1
NUMBER
DESCRIPTION
1
Motor, Gear Box and Chain Bucket: Standard with all Smart Carts.
2
Analog Control Handle.
3 8-pin cable: Standard length, pre-wired.
4 Contorls Enclosure: Stadard with all Smart Carts.
5 On / Off Power Switch for Smart Cart.
6 Charge Meter.
7
AC Charger Cord.
8
Optional: Digital Control Handle.
1
4
3
6
2
5
7
8

KNIGHT SMART CART OPERATION MANUAL
SECTION 3
OPERATION
11
B. Smart Cart Functionality Modes
Shut Down
Step 1. Turn off the power switch located on the controls box.
Step 2. Plug in the unit to 120VAC power to charge the battery.
Start Up
Step 1. Unplug the unit, if it is charging.
Step 2. Turn on the power switch located on the controls box.
Work Mode
Turn the power switch to the ON position and it will turn GREEN.
•The GREEN indicator will illuminate.
Systems with Analog Lever Style Lift Controls:
Step 1. Press the analog thumb rocker switch to the left or right to move the cart upwards or
downwards.
Systems with Discrete Up / Down Style Lift Controls:
Step 1. Press the left lever to move the cart in the downward direction and right lever to move the
cart in the upward direction.
Travel Limits
NOTE
During operation the cart will ramp down in speed as the travel limits are
triggered.
NOTE
The absolute upper and lower travel limits are factory set to the physical
limits of the Smart Cart.
Fault Mode
The speed controller board is located under the cover. It has a fault LED that designates if a
system fault occurs.This table shows the LED Flashing frequency depending on the current fault.
Fault
Number
Fault / Signal from
Controller
LED Flashing Frequency
1
Power On
One blink.
2
Current Limit Fault
Led is lit solid.
3
Current Trip Fault
Blinks fast with no pauses.
4
Zero-Current Trip Fault
Long blink and a short pause.
5
Overvoltage Fault
Blinks fast (4) four times and a long pause.
6
Overheat Fault
Short blink and a long pause.
7
Timeout Fault
Blinks fast (3) three times and then a long blink.
8
Input Fault
Blinks fast (2) two times and then a long blink.

KNIGHT SMART CART OPERATION MANUAL
SECTION 4
MAINTENANCE
12
4. MAINTENANCE
A. CHAIN INSPECTION
4.1 Inspection Overview
The inspection procedures and recommendations in this manual are based on
ANSI/ASME B30.16 “Overhead Underhung and Stationary Carts” and
ISO7592-1983 “Calibrated Round Steel Link Lifting Chains -- Guidelines to proper use and
maintenance.” The following definitions and recommendations are from both specifications and
pertain to the recommended inspection procedures in this manual.
Qualified Person:A person who, by possession of a recognized degree in an applicable field, or
certificate of professional standing, or who by extensive knowledge, training and experience, has
successfully demonstrated the ability to solve or resolve problems relating to the subject matter at
work.
Designated Person:A person selected or assigned by the employer or the employer’s
representative as being competent to perform specific duties.
Abnormal Operating Conditions:Environmental conditions that are unfavorable, harmful, or
detrimental to the operation of a cart, such as excessively high or low ambient temperatures,
exposure to weather, corrosive fumes, dust laden or moisture laden atmospheres, and hazardous
locations.

KNIGHT SMART CART OPERATION MANUAL
SECTION 4
MAINTENANCE
13
4.2 Use of LIFT Safely in Any Application
Don’t stack multiple objects on the Smart Cart. These are designed to lift
one object at a time.
Do not pull the Smart Cart long distances. The cart is designed to be
pushed over level ground.
Do not lift a heavy load onto the Smart Cart.

KNIGHT SMART CART OPERATION MANUAL
SECTION 4
MAINTENANCE
14
4.3 Determining the Frequency of Chain Inspections
Knight recommends utilizing load criteria and duty cycle data when determining the frequency of
inspections. Inspection frequency should be identified by a qualified person and is based on factors
such as the severity of the environment the cart is being used in, percentage of capacity lifts, cycle
time and shock loading. Each Smart Cart should be rated individually and inspections performed in
accordance with that rating.
Proper maintenance depends on an evaluation of the severity of usage to which the cart and the
chains are subjected to in the specific application.
The overall determination of how often the cart and chains should be inspected is a combination of its
Service Rating Load Criteria (4.3.1) and its Service Class or Duty Cycle (4.3.2).
4.3.1 Service Rating Load Criteria
Light Service: Cart and chains normally subjected to light loads and very rarely to maximum
loads.
Moderate Service: Cart and chains normally subjected to moderate loads but fairly frequently to
maximum loads.
Heavy Service: Cart and chains normally subjected to loads of heavy magnitude and frequently
to maximum loads.
Very Heavy Service: Cart and chains regularly subjected to maximum loads.
4.3.2 Service Class (Duty Cycle)
Service Class is determined by the total number of cycles the system has performed. (Table 4-1)
•Service Class 0: 0 to 20,000 loaded cycles.
•Service Class 1: 20,001 to 100,000 loaded cycles.
•Service Class 2: 100,001 to 500,000 loaded cycles.
•Service Class 3: 500,001 to 2,000,000 loaded cycles.
•Service Class 4: over 2,000,000 loaded cycles.
Cycles Per Day
Desired Life (Years)
1
5
10
20
30
5
0
0
0
1
1
10
0
0
1
1
2
25
0
1
1
2
2
50
0
1
2
2
3
100
1
2
2
3
3
200
1
2
3
3
4
300
2
3
3
4
4
750
2
3
4
4
4
1,000
2
3
4
4
4
Table 4-1: Service Class
Example: If the system is performing 100 cycles per day, it will progress though Service Classes
during its use: 1 year 26,000 cycles Service Class 1
5 years 130,000 cycles Service Class 2
10 years 260,000 cycles Service Class 2
20 years 520,000 cycles Service Class 3
30 years 780,000 cycles Service Class 3

KNIGHT SMART CART OPERATION MANUAL
SECTION 4
MAINTENANCE
15
4.4 Type of Inspections
The inspection procedure is divided into two general classifications based upon the intervals at which the
inspections should be performed for the cart and chains during regular use. The general classifications are
herein designated as "frequent" and "periodic" with respective intervals between inspections as defined
below.
In addition, visual observations shall be conducted during regular service for any damage or evidence of
malfunction which might occur between regular inspections.
4.4.1 Frequent Inspection (Visual)
This is a visual examination of the cart and its chains by the operator or other designated
personnel, without requiring records to be made. This inspection should be carried out at the
following intervals:
A. Light Service or Service Class 0 / 1 – Every Month
B. Moderate Service or Service Class 2 – Every Two Weeks
C. Heavy Service or Service Class 3 – Every Week
D. Very Heavy Service or Service Class 4 – Every Day
Additionally, the operator should check the system continually during operation to ensure that no
malfunctions are occurring (such as abnormal noises or binding of the chain).
4.4.1.1 What to Look for During a Frequent Inspection
Operator should examine the chain throughout its working length to detect any evidence
of wear, distortion or external damage. Equipment should be operated under a load as
near as possible to the usual operating load, in both directions and observe the
functioning of the chain. The chain should feed smoothly into and out of the tower unit.
Additionally, the operator should check the system continually during operation to ensure
that no malfunctions are occurring.
•Check for visual signs or abnormal noises (grinding etc.) which would indicate a
potential problem.
•Ensure controls function properly and return to neutral when released.
•Ensure the load chain feeds through the tower unit correctly.
•Ensure that the chain doesn’t bind, is excessively noisy or “clicks” as it leaves the
bottom of the tower unit.
If any of these abnormal conditions are evident, the Smart Cart should be taken out of
service and a detailed inspection and corrective actions should be taken by qualified
maintenance personnel.

KNIGHT SMART CART OPERATION MANUAL
SECTION 4
MAINTENANCE
16
4.4.2 Periodic Inspection (Documented)
This is a thorough examination of the cart and its chains conducted by a qualified person, making
records of external conditions to provide a basis for the cart’s continuing evaluation. This
Inspection should be carried out at the following intervals:
A. Light Service or Service Class 0/1 – Yearly
(equipment remains in place).
B. Moderate Service or Service Class 2 – Every Six Months
(equipment remains in place unless external conditions indicate that disassembly
should be done to permit detailed inspection).
C. Heavy Service or Service Class 3 – Every Three Months
(equipment remains in place unless external conditions indicate the disassembly
should be done to permit detailed inspection).
D. Very Heavy Service or Service Class 4 – Every Six Weeks
(equipment remains in place unless external conditions indicate that disassembly
should be done to permit detailed inspection).
4.4.2.1 Recommendations for Periodic Inspections
Perform the inspection detailed under section 4.4.1.1 “What to Look for During a
Frequent Inspection” of this manual.
Next, the chains should be cleaned for inspection, using any cleaning method that will not
cause damage. Adequate lighting should be provided for the person inspecting the
chain. The chain should be examined link by link for cracks, gouges, nicks, distortion,
corrosion, deposits of foreign material, and for interlink wear. To inspect for wear at the
interlink contact points, slacken the chain and rotate adjacent links to expose the inner
surface of the link. If wear is observed or if elongation is suspected, measure the chain
using a chain gauge for the Smart Cart.
A. Chain Link Thickness
If chain is worn to less than the minimum allowable thickness (T), remove the
chain from service. (Refer to Figure 4-1)
Minimum Allowable Chain Link Thickness at Any Point
Nominal Chain Size
Minimum Thickness “T”
Inches
mm
Inches
mm
.157
4.0
.137
3.48
.196
5.0
.171
4.35
Figure 4-1
T