210 Inverness Center Parkway
Birmingham, AL 35242

Telephone: 205-991-7733
Facsimile: 205-991-9993
www.altec.com

This notice applies to your vehicle. See attached serial number list.
Dear Altec Owner,
Altec Industries, Inc. has developed a product improvement as described in the included Service Information
Letter (SIL). According to our records, you own one or more units this applies to.
Refer to the included SIL for the items covered under the Altec warranty policy.
Compare the serial number of your unit to the included list of affected units to verify that your unit is affected.
You may also contact Altec at 1-877-GO ALTEC (1-877-462-5832) with your unit’s serial number to determine
if there are any other outstanding notices.
If you have sold or retired the unit, please call Altec at 1-877-GO ALTEC (1-877-462-5832) to update the records.
We regret this inconvenience; however, we are taking this action in the interest of your safety and continued
satisfaction with Altec products.
Thank you for your immediate attention on this important matter.

Altec Industries, Inc.
Elizabethtown Operations
Elizabethtown, KY

SIL 819

Service Information Letter
August 13, 2021
Units Affected: 2017-2020 Ford F350/F450/F550 chassis with Timbren springs installed (Verify that your
unit serial number is affected by reviewing the attached list in this SIL or by accessing your fleet on
connect.altec.com/login)

Timbren Springs Inspection
Altec is committed to providing our customers with safe and reliable products from initial delivery
throughout the useful life of the unit.
The affected units were manufactured with Timbren Springs installed near the chassis front coil springs. Altec has discovered that the Timbren springs can loosen over time and may eventually become disconnected.
Altec requires the Timbren springs to be inspected no later than the next preventive maintenance interval
or 90 days from the receipt of this SIL, whichever comes first. The Inspection Procedure begins on page 2.
Missing Timbren spring(s) must be replaced. Order the replacement part(s) as described in the Inspection
Procedure. Loose Timbren springs must be secured using the Repair Procedure for Loose Timbren Springs
beginning on page 3.
This inspection and repair are covered under the Altec Warranty Policy and can be performed by Altec,
the customer, or the customer’s warranty provider. Altec will perform the work for free at an Altec facility.
If the customer or the customer’s warranty provider performs the work, a warranty claim must be submitted to be reimbursed for the cost of the parts and/or labor. Altec will allow up to $22.50 for the labor to
perform the inspection, up to $45 for the labor to perform the repair on one side, and up to $67.50 for the
labor to perform the repair on both sides.
Call 1-877-GO ALTEC (1-877-462-5832) option 3 to schedule the work to be done by an Altec Mobile
Service technician or option 2 to schedule the work to be done at an Altec facility. Customers are responsible for the travel costs of an Altec Mobile Service technician if the technician performs the inspection
and/or repair at the owner’s location.

Inspection labor
Repair labor
Account #
Travel
NHTSA code
Prime fail P/N
Doc ref

Altec Use Only
0.25 hr
0.5 hr for 1 spring, 0.75 hr for both springs
010.0557.43151.634.0000.000
Not included
02
N/A
074900772

Altec Use Only
Parts Kit
Part No.
Qty Warranty
Timbren spring replacement kit
991340249 1 or 2
Yes

Page 1 of 5

SIL 819

Inspection Procedure
The purpose of this inspection is to ensure that two front rubber springs are in place and secured tightly
on the chassis. No tools are required for this procedure. Read and understand all steps of the instructions
before beginning the procedure.
1. Position the unit on a level surface. Apply the parking brake and turn off the engine. Remove the key
from the ignition and secure it. Chock the rear wheels. Follow your employer’s vehicle lockout/tagout
procedure.
Part A – Inspect for Missing Timbren Springs
2. Look for a rubber spring located between the chassis frame rail and the axle near the front coil spring
at both the street side and the curb side of the chassis (refer to Figure 1). If a yellow cone-shaped rubber spring is present on both sides (refer to Figure 2), no further inspection is needed. Proceed to the
Completion Procedure with Two Rubber Springs.

Rubber
Spring
Location

Figure 1 – Under Chassis View
Spacer
Plate
Yellow Cone
Spring

Steel
Spacer*
Rubber
Spacer
(Only on
Some
Units)
Timbren
Spring*

Figure 2 – Yellow Cone Spring Installation

*=Included
in Kit
Figure 3 – Black Timbren Spring Installation

3. If both black Timbren springs are missing (refer to Figure 3), call 1-877-GO ALTEC (1-877462-5832) option 1 and order two Timbren Spring Replacement Kits, part number 991340249. Proceed to the Completion Procedure with Missing Timbren Spring(s)

Page 2 of 5

SIL 819

4. If one black Timbren spring is missing, call 1-877-GO ALTEC (1-877-462-5832) option 1 and
order one Timbren Spring Replacement Kit, part number 991340249.
Part B – Inspect for Timbren Spring Tightness
5. Check each Timbren spring for tightness (no movement) by attempting to rotate it by hand in the
clockwise direction as viewed from below.
• If spring movement is detected, proceed to the Repair Procedure for Loose Timbren Springs.
• If both springs are tight, proceed to the Completion Procedure with Two Rubber Springs.
Repair Procedure for Loose Timbren Springs
Loctite 262 threadlocker, a hydraulic jack with a 6-ton minimum lifting capacity, and jack stand with a
6-ton minimum load rating are required for this procedure. No other tools are needed. Read and understand all steps of the instructions before beginning the procedure.
1. Position the unit on a level surface. Apply the parking brake and turn off the engine. Remove the key
from the ignition and secure it. Chock the wheels. Follow your employer’s vehicle lockout/tagout
procedure.
2. Place the jack under the chassis frame on the side with a loose Timbren spring. If both Timbren springs
are loose, start on either side.
3. Raise the vehicle with the jack until the axle hangs freely on that side. Properly support the vehicle
with the jack stand.
4. Remove the loose Timbren spring from the threaded fastener by turning it counterclockwise as viewed
from below. Remove the spacer(s) from the threaded fastener and place it (them) on the ground in the
same orientation as removed.
5. Check if the spacer plate is tight against the chassis frame by trying to rotate it by hand. If it moves,
tighten the spacer plate mounting cap screw to secure the plate firmly to the chassis frame.
6 Apply Loctite 262 threadlocker
in a continuous strip from top
to bottom on the threads of the
Timbren spring mounting fastener below the spacer plate (refer to Figure 5).
7. Install the spacer(s) and Timbren spring on the mounting fastener in the original orientation,
(refer to Figure 6). Tighten it by
hand by turning it clockwise as
viewed from below until it bottoms out against the spacer and
cannot be rotated any farther. No
tools are required.

Spacer Plate
Timbren Spring

Apply Thread Locking
Adhesive to Full
Length of Threads
Figure 5 – Preparing Timbren
Spring Mounting Fastener

Page 3 of 5

Figure 6 – Installing
Timbren Spring

SIL 819

8. Use the jack to raise the vehicle off the jack stand, remove the jack stand, and lower the vehicle back
to the ground.
9. Repeat steps 2 through 8 if the Timbren spring on the other side is loose.
10. If both Timbren springs are present, proceed to the Completion Procedure with Two Rubber Springs.
11. If one Timbren spring is missing, proceed to the Completion Procedure with Missing Timbren
Spring(s).
Completion Procedure with Two Rubber Springs
1. Put the unit back into service.
2. Complete the Inspection Sheet at the end of the SIL and return it to Altec.
Completion Procedure with Missing Timbren Spring(s)
1. Put the unit back into service.
2. Do not complete the Inspection Sheet at the end of the SIL. A separate reply card will be provided with the Timbren Spring Replacement Kit to document the completion of the SIL..

Page 4 of 5

SIL 819

SIL 819 Timbren Springs Inspection Sheet
Complete this form and return to Altec to document inspection completion.
Choose one of these options.
• Online through the customer portal – Altec Connect*
Sign in or Register for an account at www.altec.com/altec-connect/
1. Select Equipment
2. Select Altec Product Notices
3. Select Report a Completed APN
• Scan and Email to [email protected]
• FAX to 1-877-659-9929
*Customer performed warranty can be submitted online for reimbursement
through Altec Connect.
Model

Altec Unit
Serial Number

To login to your existing
Altec Connect account,
scan here with your
smart phone!

Date Inspected

Company Name: _______________________________________________

Phone____________________________

Service Company Name:_________________________________________

Phone:___________________________

Company Contact: _________________________________________________________________________________
Company Street Address:_____________________________________________________________________________
City _______________________________________________ State:_________________ ZIP Code:________________
Signature:_____________________________________________________

Submission of this form does not order parts or schedule service from Altec.
If the customer or the customer’s warranty provider performs the repair, a warranty claim must be submitted to be reimbursed for the cost of the parts and/or labor through Altec Connect.
For more information or to schedule the work to be done by an Altec Service technician, call:
1-877-GO ALTEC (1-877-462-5832)
Make copies of this form for additional units if needed.
Page 5 of 5