Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
SIL-3214
Service Bulletin/Repair Instructions
Altec has learned that the king pin towing capacity placard might not be installed on certain DL derricks built from August 2005 to October 2024. This could lead to unintentional overloading which could result in cracks or deformations to the king pin assembly. Altec has had no reports of this issue occuring. This area should be inspected regularly as outlined in the Welds and Fasteners subsections in Section 4 of the unit’s Maintenance and Parts Manual.
SIL-3143
Service Bulletin/Repair Instructions
Altec has learned that a 12-volt Airtronics relay installed in the PDM could have been manufactured to an insufficient threshold on certain units built from December 2004 to October 2022. This can cause the relay to overheat and fail, causing the accessory lights to stop working.
SIL 843
Service Bulletin/Repair Instructions
Altec has learned that the lift cylinder pivot pin retainers may bend or break during use on DT80 digger derricks built from March 2007 to October 2021. If the pin retainer fails, the pivot pin will still be held in place in the turntable or lower boom by retaining rings. However, the pin will be able to rotate in the pinning holes during lift cylinder movement. Altec has developed a kit containing high-strength pin retainers to replace the original pin retainers at both ends of the cylinder. The customer should order and install the High-Strength Pin Retainer Kit or schedule the installation of this kit by Altec. Do this no later than the next preventive maintenance interval or 30 days from the receipt of the SIL, whichever comes first. Also ensure that the lift cylinder spherical bearings are regularly greased according to the schedule stated in the Lubrication section in Section 4 of the unitâÂÂs Maintenance Manual. This repair is covered under the Altec Warranty Policy and can be performed by Altec, the customer, or the customerâÂÂs warranty provider. Altec will perform the work for free at an Altec facility.
SIL 795
Service Bulletin/Repair Instructions
Some customers have reported cracks occurring in the stationary frame tubes above the chassis frame rails of some HD35A pressure diggers built from 2005 through 2020. Investigation has shown this to be caused by improper orientation of the spacer blocks welded to the bottom of the stationary frame tubes. Altec requires the stationary frame on each unit to be inspected no later than the next preventive maintenance interval. If the inspection shows that the spacer blocks are oriented incorrectly, the unit must be repaired no later than 30 days after the inspection using the Repair Procedure provided in the notification.
SIL 677
Service Bulletin/Repair Instructions
This service information letter (SIL) notified customers to inspect the electrical slip ring for proper installation. Slip rings found to be improperly installed are to be replaced.
SIL 669
Service Bulletin/Repair Instructions
This service information letter (SIL) notified customers to add a ground wire to the electrical slip ring.