Interference Between Hood Assist Spring And Charge Air Cooler Coupling Hose
On Mack CTP, CHN and CT models manufactured before April 16, 2007, there may be an interference condition between the hood assist spring and the coupling hose on the charge air cooler inlet. When the hood is closed and the vehicle is in operation, spring oscillations result in a wear mark and an eventual hole being worn into the coupling hose, allowing unfiltered air to enter the air intake system.
To correct this condition, a replacement hood spring (Part No. 57QL262BM) is available. If you see a wear mark in the charge air cooler inlet side coupling hose, replace the existing hood assist springs on both sides of the chassis with the new springs. The hood assist springs must be replaced in pairs.
Replacement Axle Housings
Cracks might develop in the rear axle housings on certain Mack model chassis equipped with AL rear air suspensions and Mack rear axles.
These cracks appear on the top or bottom corners of the housings in the area behind the axle seats. (See Figure 1.)
Affected chassis were manufactured May 2004 or later and are equipped with housing Part No. 19QF5318P7 or 19QF318P8. If you notice axle housing cracks, replace them with the appropriate parts.
Cylinder Head Replacement Kit
Meritor WABCO now authorizes replacement of the cylinder head as a warrantable repair on the WABCO Model 318 air compressor. When diagnosing an air compressor that leads to a problem with the cylinder head, the cylinder head should be replaced rather than replacing the compressor.
Before you disassemble the air compression, you must contact the ArvinMeritor OnTrac Customer Service Center at 800-535-5560.
The cylinder head replacement kit (Part No. 8235-S9119068002) is available and installation instructions are supplied.
NHTSA RECALL UPDATES
The following are some recent recalls that have been made by the National Highway Traffic Safety Administration.
- PACCAR recalled 1377 model year 2007 to 2008 T800, T600 and T300 trucks for failing to comply with the requirements of Federal Motor Vehicle Safety Standard No. 121, Air Brake Systems. The trailer light line may have been routed using too tight of a bend radius. This routing method could cause the wires within the harness plug to be pulled away from the chassis plug resulting in an intermittent or complete electrical power loss to the trailer. If power is lost, the electrical circuits would not provide power to the antilock brake system on the towed vehicle, thus would increase the risk of a crash.
- Mack is recalling 3587 model year 2006 to 2007 CTP and model year 2008 GU trucks. The cotter pin that retains the brake pedal clevis pin may not have been installed. The clevis pin connects the brake pedal to the brake foot valve. If the pin comes loose, the driver won’t be able to apply the service brake, which could result in a crash.
- Volvo Trucks is recalling 84 model year 2007 to 2008 VNL and VNM trucks. The axle housings may have been manufactured with steel that was out of specification, which could result in a fatigue failure over time. If a fatigue failure occurs and is left unattended, the axle may lock up or the end of the axle could come off, which might result in a crash.
- Mitsubishi Fuso is recalling 8712 of the following: Model year 2001 to 2002, and 2004 FE640 trucks; model year 2005 FE83D trucks; and model year 2005 to 2006 FE84D, FE85D, FG84D and FH210 trucks. The cylinder head idler gear bushing may have been machined improperly, causing excessive stress on the cylinder head idler gear shaft. Continuing operation in this condition could cause the idler gear shaft flange to break and generate abnormal engine noise or engine oil leaks. The engine might stall and not restart, increasing the risk of a crash.
- PACCAR is recalling 4592 model year 2003 to 2008 T800, W900, C500 and T300 trucks. The wiring, parts or transmission programming required for the auto neutral feature to function as designed were not installed, not corrected or not programmed properly. If any of these conditions exists, the transmission will not shift automatically into neutral when left in drive with the parking brake engaged. The vehicle might move without warning, increasing the risk of a crash.
