NHTSA ID Number: 10183868
Manufacturer Communication Number: SA626
TSB/Document Date: 2020-12-07
Summary
Rotation Bearing Deflection Test
procedures are performed.
Do Not Perform Maintenance Unless:
• You are trained and qualified to perform maintenance on this
machine.
• You read, understand and obey:
o manufacturer’s instructions and safety rules
o employer’s safety rules and worksite regulations
o applicable governmental regulations
• You have the appropriate tools, lifting equipment and a suitable
workshop.
The information contained in this tech tip is a supplement to the service
manual. Consult the appropriate service manual of your machine for
safety rules and hazards.
Tech-Tip 44 Rev A
2
Released: 3/31/16
Tech Tips
Step 1
Read this entire procedure and the section in the
maintenance manual that applies to this
procedure before starting the work.
Step 2
Position the truck in a suitable location. Check
for overhead obstructions. Set the outriggers.
There can be no additional tools or materials in
the platform with the exception of a platform
liner.
Step 3
Check for obstructions before rotating boom.
Rotate boom 180 degrees off the rear of the
vehicle. Place lower boom at 0 degrees and
unfold the upper boom to 180 degrees. See
image below.
Tech-Tip 44 Rev A
3
Released: 3/31/16
Tech Tips
Step 4
Attach the dial indicator base to the pedestal,
positioning the tip perpendicular to the edge of
the turntable bottom plate at the specified
indicator radius.
Note: Consult the table at the end of this
document for the dial indicator radius for your
specific unit.
Note: Make sure you know which way the dial
indicator rotates when it moves for the correct
reading.
OM/OMD
XM
Tech-Tip 44 Rev A
HR/HRX
XML/XT
XT PRO
4
Released: 3/31/16
Tech Tips
Step 5
Zero out the dial indicator. Verify that you have
at least .25 inches of movement on the dial
indicator in both directions when zeroing.
Step 6
Position the lower boom as indicated in the
illustration below. Lower boom fully articulated
and upper boom horizontal.
Tech-Tip 44 Rev A
5
Released: 3/31/16
Tech Tips
Step 7
Read the number on the dial indicator. This is
your rotation bearing deflection. Record the
reading and check this reading against the
“Maximum Allowable Bearing Deflection” in the
following table.
Note: Measure the deflection at the same boom
location and dial indicator radius every time this
test is performed to provide consistent
measurements that can be compared over the
life of the machine.
Tech-Tip 44 Rev A
6
Released: 3/31/16
Tech Tips
Unit
Model
Maintenance
Manual
HR37-40
HR40 thru
HR46
HR50 thru
HR55
HRX-XML
OM
OMD
SC
XM
XT55
XT60
XT Pro
463199
Indicator
Max
Radius Deflection
(inch)
(inch)
11.50
0.177
463199
14.00
0.175
463199
14.00
0.160
477640
463203
463535
463535
469572
463107
463107
611447
14.00
14.00
15.00
14.00
15.00
14.00
14.00
14.00
0.160
0.160
0.156
0.175
0.156
0.175
0.160
0.160
Unit Specific Maximum Allowable Bearing Deflection
Tech-Tip 44 Rev A
7
Released: 3/31/16
Tech Tips
Service Call:
Rotation Bearing Deflection Test
Tools Required:
• Dial Indicator with Magnetic Base
• Maintenance Manual for the Unit
Being Tested
• Dynamometer
• Digger Derrick
for the negative
deflection test
• Auxiliary Load Line
Model(s):
TPL 29, TPL 33, TE/TS
Tech-Tip 45 Rev A
1
Released: 3/31/16
Tech Tips
Tech Tip Safety Rules
Danger
Failure to obey the instructions and safety rules in the appropriate
Operator's Manual and Service Manual for your machine will result in
death or serious injury. Many of the hazards identified in the operator’s
manual are also safety hazards when maintenance and repair
procedures are performed.
Do Not Perform Maintenance Unless:
• You are trained and qualified to perform maintenance on this
machine.
• You read, understand and obey:
o manufacturer’s instructions and safety rules
o employer’s safety rules and worksite regulations
o applicable governmental regulations
• You have the appropriate tools, lifting equipment and a suitable
workshop.
The information contained in this tech tip is a supplement to the service
manual. Consult the appropriate service manual of your machine for
safety rules and hazards.
Tech-Tip 45 Rev A
2
Released: 3/31/16
Tech Tips
Step 1
Read this entire procedure and the section in the
maintenance manual that applies to this
procedure before starting the work.
Step 2
Position the truck in a suitable location. Check
for overhead obstructions. Set the outriggers.
There can be no additional tools or materials in
the platform with the exception of a platform
liner.
Step 3
Check for obstructions before rotating boom.
Rotate boom 90 degrees off the side or rear of
the vehicle. Place upper boom at 0 degrees with
boom extension fully retracted. See images
below.
Tech-Tip 45 Rev A
3
Released: 3/31/16
Tech Tips
Step 4
Attach a dynamometer between the boom tip
and the auxiliary load line for pulling up the
boom (negative deflection).
Tech-Tip 45 Rev A
4
Released: 3/31/16
Tech Tips
Step 5
Attach the dial indicator base to the pedestal,
positioning the tip perpendicular to the edge of
the turntable bottom plate at the specified
indicator radius.
Note: Consult the table at the end of this
document for the dial indicator radius for your
specific unit.
Note: Make sure you know which way the dial
indicator rotates when it moves to get the correct
reading.
Tech-Tip 45 Rev A
5
Released: 3/31/16
Tech Tips
Step 6
Zero out the dial indicator. Verify that you have
at least .25 inches of movement on the dial
indicator in both directions when zeroing.
Step 7
Pull up on the boom using the Digger Derrick,
dynamometer, and auxiliary load line.
Note: Do not exceed the value specified in the
appropriate manual.
Step 8
Read the number on the dial indicator. This is
your rotation bearing deflection. Record the
reading and check this reading against the
“Maximum Allowable Bearing Deflection” in the
following table.
Step 9
Release the up pressure on the boom.
Tech-Tip 45 Rev A
6
Released: 3/31/16
Tech Tips
Step 10
Attach a dynamometer between the weight and
load line for pulling down the boom (positive
deflection). Do not exert any load on the boom.
Step 11
Zero out the dial indicator.
Step 12
If equipped use the winch and pull up, if not
equipped lift up with the lift cylinder.
Note: Do not exceed the value specified in the
appropriate manual.
Step 13
Read the number on the dial indicator. This is
your rotation bearing deflection. Record this
reading and check this reading against the
“Maximum Allowable Bearing Deflection” in the
following table.
Tech-Tip 45 Rev A
7
Released: 3/31/16
Tech Tips
Note: Measure the deflection at the same boom
location and dial indicator radius every time this
test is performed to provide consistent
measurements that can be compared over the
life of the machine.
Unit
Model
Maintenance
Manual
TPL
TE/TS
463668
463312
Indicator
Radius
(inch)
11.50
12.75
Max
Deflection
(inch)
0.176
0.160
Unit Specific Maximum Allowable Bearing Deflection
Tech-Tip 45 Rev A
8
Released: 3/31/16
Tech Tips
Service Call:
Rotation Bearing Deflection Test
Tools Required:
• Dial Indicator with Magnetic Base
• Maintenance Manual for the Unit
Being Tested
Model(s):
LT, TPL, TLM
Tech-Tip 49 Rev A
1
Released: 3/31/16
Tech Tips
Tech Tip Safety Rules
Danger
Failure to obey the instructions and safety rules in the appropriate
Operator's Manual and Service Manual for your machine will result in
death or serious injury. Many of the hazards identified in the operator’s
manual are also safety hazards when maintenance and repair
procedures are performed.
Do Not Perform Maintenance Unless:
• You are trained and qualified to perform maintenance on this
machine.
• You read, understand and obey:
o manufacturer’s instructions and safety rules
o employer’s safety rules and worksite regulations
o applicable governmental regulations
• You have the appropriate tools, lifting equipment and a suitable
workshop.
The information contained in this tech tip is a supplement to the service
manual. Consult the appropriate service manual of your machine for
safety rules and hazards.
Tech-Tip 49 Rev A
2
Released: 3/31/16
Tech Tips
Step 1
Read this entire procedure and the section in the
maintenance manual that applies to this
procedure before starting the work.
Step 2
Position the truck in a suitable location. Check
for overhead obstructions. Set the outriggers.
There can be no additional tools or materials in
the platform with the exception of a platform
liner.
Step 3
Check for obstructions, then raise upper boom
to the vertical position. Do not rotate the boom.
Tech-Tip 49 Rev A
3
Released: 3/31/16
Tech Tips
Step 4
Attach the dial indicator base to the pedestal,
positioning the tip perpendicular to the edge of
the turntable bottom plate at the specified
indicator radius.
Note: Consult the table at the end of this
document for the dial indicator radius for your
specific unit.
Note: Make sure you know which way the dial
indicator rotates when it moves to get the correct
reading.
Tech-Tip 49 Rev A
4
Released: 3/31/16
Tech Tips
Step 5
Zero out the dial indicator. Verify that you have
at least .25 inches of movement on the dial
indicator in both directions when zeroing.
Step 6
Raise the lower boom to the vertical position
with the upper boom horizontal. Fully extend the
upper boom. Do not rotate the boom.
Tech-Tip 49 Rev A
5
Released: 3/31/16
Tech Tips
Step 7
Read the number on the dial indicator. This is
your rotation bearing deflection. Record the
reading and check this reading against the
“Maximum Allowable Bearing Deflection” in the
following table.
Note: This value is based on a specific
dimension of the reading from the centerline of
rotation. This dimension is given with the
maximum deflection.
Note: Measure the deflection at the same boom
location and dial indicator radius every time this
test is performed to provide consistent
measurements that can be compared over the
life of the machine.
Unit
Model
Maintenance
Manual
LT
TL
TPL
463067
463209
463668
Indicator
Radius
(inch)
11.50
11.50
11.50
Max
Deflection
(inch)
0.176
0.144
0.176
Unit Specific Maximum Allowable Bearing Deflection
Tech-Tip 49 Rev A
6
Released: 3/31/16
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TSB/Document ID: SA626
Replacement Service Bulletin Number:
MFR Communication Date: 2016-03-31
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: WHEELS
MFR Component System:
MFR Component Subsystem:
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