Terex Utilities

SERVICE ADVISORY
DATE: 3/31/16
TO: Owners, Users, Dealers, and Installers
Models Affected: All Current Production Models
SUBJECT: Rotation Bearing Deflection Test

SA-626
REVISED:

Issue:
Terex has updated the procedures used to test Rotation Bearing Deflection by providing a specific distance for
the dial indicator and a unit specific maximum bearing deflection measurement. The updated procedures are
available on our public Terex Utilities website. More information on accessing tech-tips can be found on the next
page.
Choose the appropriate product type listed below for each Tech-tip from the dropdown.
• Tech-tip 4 – Rotation Bearing Deflection Test – (Digger Derricks)
• Tech-tip 43 – Rotation Bearing Deflection Test – (Non-OverCenter)
• Tech-tip 44 – Rotation Bearing Deflection – (Overcenter)
• Tech-tip 45 – Rotation Bearing Deflection – (Telescopic)
• Tech-tip 49 – Rotation Bearing Deflection – (Telescopic)

Action:
What the Owner can do:
1. Download the relevant Tech-tips for your fleet and add them as an addendum to the existing manual
2. Distribute Tech-tips to all technicians
If you have any questions you can contact your nearest dealer at this web site;
http://www.terex.com/utilities/en/products/dealer-locator/index.htm.

What Terex will do:
Terex has made available the updated Tech-tips on our public website. Choose your product type and model to
view the relevant Tech-tips for your machine. A copy of each of the Tech-tips is also attached to this Service
Advisory.

Terex South Dakota, Inc.
500 Oakwood Road
Watertown, SD 57201 USA
(605) 882-4000 • Fax (605) 882-1842

Accessing Tech-tips
To access Tech-tips, go to http://www.terex.com/utilities/en/service-support/tech-tips/index.htm
Using the Product Type dropdown box, choose the appropriate product type. To view Tech-tip #4, choose “Digger
Derrick”

Click on Tech-tip #4 – Rotation Bearing Deflection Test to view the tech-tip

To view the tech-tip on TM Bearing Deflection, select Non-Overcenter Aerial Device from the Product Type
dropdown menu.

Click on Tech-tip #43 – Rotation Bearing Deflection Test to view the tech-tip

SN626 page 2

Tech Tips
Service Call:
Rotation Bearing Deflection Test
Tools Required:
(1) Dial Indicator with Magnetic Base
(2) Maintenance Manual for the Unit
Being Tested
(3) Additional outrigger pads as
needed

Model(s):
All: Telelect / Simon-Telelect / Terex
Utilities manufactured Digger Derricks

Tech-Tip 4 Rev B

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 4 Rev B

1

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.

Step 3
Check for obstructions before rotating boom.
Position the boom where it is used most
frequently during operation. This is usually to the
curbside of the truck or 45 degrees forward or
backwards of this position.

Tech-Tip 4 Rev B

1

Released: 3/31/16

Tech Tips
Step 4
Extend the second (or stinger) section of the
boom. If the second doesn’t reach the ground,
then lower the auger and place an outrigger pad
at the position the auger will contact the ground.
If the unit isn’t equipped with an auger, stack an
adequate number of outrigger pads to allow the
sheave head to make contact with the outrigger
pads.
Do not contact the outrigger pads at this point.

Step 5
Check for obstructions. Boom down slowly and
stop just above the outrigger pads.

Tech-Tip 4 Rev B

1

Released: 3/31/16

Tech Tips
Step 6
Attach the dial indicator base to the pedestal,
positioning the tip perpendicular to the edge of
the turntable bottom plate and at the specified
indicator radius. Typically the dial indicator
position is at the edge of the cover for the
rotation gearbox pinion. See drawing below.
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 record the
correct reading.

Step 7
Tech-Tip 4 Rev B

1

Released: 3/31/16

Tech Tips
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 8
Slowly and carefully lower the sheave head or
auger onto the outrigger pad. Referencing the
hydraulic pressure gauge, boom down until the
gauge reads between 1,600 to 1,800 PSI.

Step 9
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
Tech-Tip 4 Rev B

1

Released: 3/31/16

Tech Tips
test is performed to provide consistent
measurements that can be compared over the
life of the machine.
Unit
Model
92
Series
Telecon
C3000
L4000
XL4000
C4000
C5000
C6000

Maintenance Indicator
Max
Manual
Radius Deflection
(inch)
(inch)
463279
16.25
0.185
463277
463277
463277
463277
463277
463277
463277

13.25
16.25
16.25
16.25
16.25
17.25
17.25

0.203
0.185
0.185
0.165
0.165
0.176
0.176

463277

17.75

0.138

463277

21.13

0.164

Before 2004

C6000
2004 to
Present

General

Unit Specific Maximum Allowable Bearing Deflection

Tech-Tip 4 Rev B

1

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):
Non Over-Center Aerial Devices:
TC, TCX, RM, RMX, TM
Bearing Deflection
The following procedure can be used for all of
the models listed above, regardless of the age of
the unit.

Tech-Tip 43 Rev. B

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 43 Rev. B

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, checking
for overhead obstructions. Set the outriggers
and level the machine. There can be no
additional tools or materials in the platform with
the exception of a platform liner.

Tech-Tip 43 Rev. B

3

Released: 3/31/16

Tech Tips
Step 3
TC and TCX:
Check for obstructions before rotating boom.
Rotate boom off rear of vehicle. Place lower
boom at 0 degrees and upper boom at 50
degrees from horizontal. See image below.

Tech-Tip 43 Rev. B

4

Released: 3/31/16

Tech Tips
TM Series:
Check for obstructions before rotating boom off
rear of vehicle. Place lower boom just out of the
lower boom rest and upper at 15 degrees. See
image below

Tech-Tip 43 Rev. B

5

Released: 3/31/16

Tech Tips
RM and RMX:
Check for obstructions before rotating boom.
Rotate boom off rear of vehicle. Place lower
boom at 0 degrees and upper at 50 degrees.
See image below.

Tech-Tip 43 Rev. B

6

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.
TC and TCX

Tech-Tip 43 Rev. B

7

Released: 3/31/16

Tech Tips
RM and RMX:

TM Series:

Tech-Tip 43 Rev. B

8

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
TC and TCX
Position the lower boom as indicated in the
illustration below. Lower boom fully articulated
and upper at horizontal.

Tech-Tip 43 Rev. B

9

Released: 3/31/16

Tech Tips
RM and RMX: Lower boom at 90
degrees and Upper boom horizontal.

Tech-Tip 43 Rev. B

10

Released: 3/31/16

Tech Tips
TM Series: Lower boom fully articulated
and upper at horizontal.

Tech-Tip 43 Rev. B

11

Released: 3/31/16

Tech Tips
Step 6
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

Manual

TC
TCX
RM
RMX
TM85/100
TM105/125

463193
477476
472198
483019
472798
472798

Indicator
Radius
14.00
14.00
15.00
15.00
17.50
20.00

Max
Deflection
0.160
0.160
0.156
0.156
0.135
0.155

Model Specific Maximum Allowable Bearing Deflection
Tech-Tip 43 Rev. B

12

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):
Over-Center Units:
HR37-55, HRX, XML, OM, OMD, XM,
XT and XT PRO

Tech-Tip 44 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