210 Inverness Center Drive
Birmingham, AL 35242

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

November 29, 2017
Dear Altec Owner,
Altec Industries, Inc. has developed a product improvement which relates to certain DB37 units
built between between serial number 0115ET0846 (January 2015) and 0417ET1045 (April 2017).
Refer to SIL 669 for items covered under the warranty policy. Altec will supply necessary parts to
correct this condition.
In order to determine if your unit is affected by SIL 669, compare the serial number of your unit with
the list of affected units as described on the SIL. The product improvement can be performed by the
customer or you may contact Altec at 1-877-GO-ALTEC (1-877-462-5832) for further assistance.
At any time, you may 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) so the
records may be changed.
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.
Midwest Division
St. Joseph, MO

SIL 669

Service Information Letter
Date: November 29, 2017
Units Affected: DB37 units built between serial number 0115ET0846 (January 2015)
and 0417ET1045 (April 2017)

Slip Ring Modification
Altec is committed to providing our customers reliable products from initial delivery throughout the useful life of the unit.
Altec discovered that the slip ring used on the DB37 to provide electrical power above rotation
on the affected units is missing an internal ground wire. The missing ground wire can cause
reduced reliability or can cause the HOP system to be triggered when it is not supposed to be
turned on.
Altec recommends that a ground wire be added to the slip ring no later than the next scheduled
service interval. The instructions for the ground wire addition begins on Page 2.
This repair is covered under the Altec Warranty Policy and can be performed by Altec or the
customer’s warranty provider. Altec will allow up to $90 for an inspection and the labor to
perform this repair. A warranty claim must be submitted for the cost of the labor. Call 1-877GO ALTEC (1-877-462-5832) to schedule the work to be done by an Altec service technician.
Customers are responsible for the travel costs of an Altec Mobile Service technician if the
technician performs the inspection or repair at the owner’s location.

Page 1 of 3

SIL 669

Repair Instructions
Normal mechanics hand tools are required for the installation of this kit. Customers need to
supply an approximately 20 inch long piece of 18 ga. wire (black color recommended, but any
color will work), a ring terminal to fit the stud connection, and a heat shrink butt splice
connector large enough to have two 18 gauge wires into one end. Read and understand all steps
of the instructions before beginning the procedure
1.Position the unit on a level surface and engage the unit’s hydraulic system. Properly set the
outriggers.
2.Remove the curbside turntable cover
from the unit (refer to Figure 1).
Cover

3. Locate the upper driver board on the
side of the turntable (refer to Figure
2). Above and to the left of the driver
board is the upper grounding block.

Figure 1 — Cover Location
Stud

Grounding Block
Additional
Grounding
Wire

CON5
Connector

Figure 2 — Upper Driver Board Connections

3.Remove the nut from the stud on the left end of the grounding block (refer to Figure 2).
4.Strip one end of the furnished 18 gauge wire and attach a ring terminal to that end of the wire
that will fit the grounding block stud. Crimp the end of the terminal securely.
5.Attach the ring terminal to the grounding block stud. Reattach the nut and tighten securely.
6.Find the black wire in the wire harness at the CON5 connector. Cut the wire about 3 inches
from the connector. Strip both ends of the cut wire.
Page 2 of 3

SIL 669

7.Strip the remaining end of the furnished 18 gauge wire. Place the stripped end of the wire
and one end of the wire cut and stripped in Step 5 in one end of the heat shrink butt connector
(refer to Figure 3). Crimp the end of the terminal securely.
Original Cut
Wire

Heat Shrink Butt
Connector

Original Cut
Wire

Additional
Grounding Wire
Figure 3 — Attaching Butt Connector

8.Place the remaining end of the black wire originally connected to CON5 into the remaining
end of the butt connector. Crimp the end of the terminal securely. Seal the ends of the butt
connector with a heat gun.
9.Secure the additional ground wire to the harness with nylon wire ties, if necessary.
10.Engage the unit’s hydraulic system. Operate the unit functions checking for proper
operation. Make any corrections necessary.
11.Reinstall the turntable cover on the unit. Retract the outriggers and return the unit to service.

Page 3 of 3