ZMD ® Frequently Asked Questions
GENUINE PARTS
21. What suspension load scale kit should be used for ZMD ® ? VANTRAAX ® , select top-mount INTRAAX ® and INTRAAX ® SP models equipped with ZMD use the same load scale kits available for models equipped with standard air springs. Please refer to Hendrickson Literature Number L1182 Controls Parts Catalog for a complete listing of load scale kits. 22. How do I inspect ZMD air springs and down stops? A visual inspection of the components during regularly scheduled trailer maintenance is all that is required. There are no additional component inspection requirements for ZMD. Follow all applicable Hendrickson installation, service, maintenance and repair procedure publications. 23. What is the suspension jounce for a ZMD air spring? The ZMD air spring is designed to provide the same suspension jounce travel as the standard air springs on the select VANTRAAX and INTRAAX suspensions. 24. Can the ZMD down stops be interchanged on ULTRAA-K ® , VANTRAAX and top-mount INTRAAX and INTRAAX SP models? NO. The ZMD down stops equipped on ULTRAA-K, VANTRAAX and top-mount INTRAAX and INTRAAX SP models are not interchangeable with one another. 25. Can a shock absorber be used to replace the down stop(s) on a suspension equipped with ZMD? There are no shock absorbers that will properly fit the ULTRAA-K suspension. Replacing a down stop with a shock is not recommended for the VANTRAAX models equipped with ZMD air springs. The same is true for the select top-mount INTRAAX and INTRAAX SP models available with ZMD. 26. Does ZMD require any special plumbing, height control valves or other valves? NO. The ZMD air spring can be installed exactly the same as current air springs including all mounting bolts, air lines and valves. 27. What are the visual differences between the ULTRAA-K, VANTRAAX, INTRAAX and INTRAAX SP with ZMD down stops? The ULTRAA-K ZMD down stop mounts within the cross member. It features a partial rod with a chain connection. The VANTRAAX ZMD down stop is a full chain that is installed to the outside of the cross member by a shock clevis. The INTRAAX and INTRAAX SP ZMD down stop is a full chain that is installed to the frame bracket by a shock clevis. 28. What is the low pressure ZMD option and why would I select this option? Low-pressure ZMD air springs are optional only for 23K AAT & 23K AANT suspensions. Selecting this option provides the 25K ZMD air spring in place of the 23K ZMD air spring. The suspension rating remains 23K, but the low-pressure ZMD air spring operates at a lower inflation pressure, resulting in a faster air-up time.
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Trailer Commercial Vehicle Systems
Refer to Hendrickson Literature No. L1212 - ZMD ® Zero Maintenance Damping ® FAQ Brochure
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