# Service bulletin SIL 783

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: 10186514
- Published by NHTSA: 2021\-02\-04
- Manufacturer's number: SIL 783
- Manufacturer's date: 2021\-01\-29
- NHTSA component: STRUCTURE

## NHTSA's summary

Structural cracking has been observed where the primary leveling cylinder mounting pin is welded to the lower boom side plate on LS 40/45/55 aerial devices. Failure of this connection could disable the hydraulic platform leveling system. Altec has developed a kit to reduce the relief pressure of the hydraulic leveling circuit. This will prevent damage to the leveling cylinder mounting pin weld joint by reducing the weld stress. Altec has also developed a kit to repair the lower boom if the side plate has cracked. Altec requires the inspection and repair be completed on the affected units by the next annual preventive maintenance interval or within one year of receipt of the SIL.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10186514-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10186514-9999.pdf)

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

## Components

Body and frame

## Vehicles listed

- 2004 to 2015 ALTEC AERIAL DEVICE

JSON: [/v1/bulletins/10186514](/v1/bulletins/10186514)

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