# Service bulletin CSN 755

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10179795
- Published by NHTSA: 2020\-09\-15
- Manufacturer's number: CSN 755
- Manufacturer's date: 2020\-06\-11
- NHTSA component: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

## NHTSA's summary

The DB41B is a tracked, off road back yard derrick product. The upper boom extend function is intended to be disabled when the Hydraulic Overload Protection \(HOP\) system is activated. HOP activates correctly when the affected units are operated from the lower controls. However, Altec has discovered that upper boom extend is not disabled when HOP is activated while operating these units from the radio controls. This is caused by an issue with the derrick control system firmware. Altec requires the derrick control system firmware version to be inspected using the AXIS Service Interface and following the Inspection and Update Procedure beginning on page 2. If the inspection indicates that the derrick firmware version is incorrect, the firmware must be updated as described.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10179795-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10179795-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Equipment and accessories, Labels and manuals

## Vehicles listed

- 2017 to 2020 ALTEC DIGGER DERRICK

JSON: [/v1/bulletins/10179795](/v1/bulletins/10179795)

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