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The shuttle and spring may need replacing when damage has occurred due to ingress of dirt into the unloader valve. If the spring or the shuttle has been damaged, you may experience a drop in pressure, or no pressure at all.
To replace, simply remove the unloader outlet coupling, where you will find the shuttle and spring inside. Replace and refit into the unloader valve.
Unloader Valve Service Kit Shuttle and Spring for Kiam KM3400P Pre-2014 Models
