Installing Air Spring on Severe-service Vehicles
Use the following procedure to install the air spring for the Hendrickson Primaax suspension in severe-duty vehicles:
New Guide Spring
A new narrower guide spring for the camshaft lifter is now being used on Caterpillar C9 engines. This will eliminate the chance of the spring becoming bent or broken.
Bent or broken guide springs can lead to damaged lobes on the cam and valve lifters.
Purge Pump & Service Pack
A new purge pump and service pack now are used on Caterpillar C13 (S/N: LEE1-Up) and C15 (S/N: SDP1-Up) engines. The new pump and service pack now have larger inlet and outlet ports.
Additional parts are required to connect the pump and the pack to existing lines and connections.
V-band Clamps for Air Inlet Connections
Effective May 1, 2006 (beginning with engine S/N: 6H1779), Mack implemented a heavy-duty V-band clamp (Part No. 1809GB329BM) into production for the elbow connection at the inlet manifold on ASET AI and AMI engines, as shown in Figure 4.
It replaces the previously used worm-screw-type clamp (Part No. 180GB329[A]M). This revised clamp is a T-bolt-type clamp that utilizes a quick-latch feature. When installing this clamp, apply a thin film of engine oil around the inside diameter of the clamp and tighten the T-bolt nut to 8 +/-0.5 Nm (70 +/-5 lb.-in.).
