# Service bulletin SIL 622

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: 10198835
- Published by NHTSA: 2021\-07\-06
- Manufacturer's number: SIL 622
- Manufacturer's date: 2015\-11\-17
- NHTSA component: ELECTRONIC STABILITY CONTROL:AUTOMATIC \(ASC\); EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT

## NHTSA's summary

Altec has received some reports of upper boom drifting on some of the above listed units. Investigation found the cause to be contamination trapped in the bottom upper boom drive cylinder by\-pass valve. Depending on the position of the booms, the upper boom on units with this condition can drift down.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2015/MC-10198835-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2015/MC-10198835-9999.pdf)

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

## Components

Driver assistance, Equipment and accessories

## Vehicles listed

- ALTEC ALTEC

JSON: [/v1/bulletins/10198835](/v1/bulletins/10198835)

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