Bruce Brown wrote:
Put the jacks in the "store" position and drive. Many times it's just an ever so slight lack of fluid or an air bubble causing it.
Our old HWH jacks would do that from time to time, the store button always solved it - and the fluid level was good.
This type problem as related to HWH is NOT slight lack of fluid or an Air Bubble. HWH systems are self bleeding and the Down switch is magnetic. IF the Down light comes ON and you have the 300/325 series HWH touch pad system the fix is to just hit the Store button even while driving and the offending jack will retract. That jack has extended due to in transit Road/Exhaust area heat. The fluid in the lines expands slightly from this heat and will cause the jack/s to slightly extend a little and this opens the Down switch on the top of the jack. Hitting Store allows that expanded fluid to be pushed back into the reservoir. The Owners manual for this system from HWH states to ALWAYS push STORE after the Chassis engine is started. This puts the system in sleep mode and IF the Transit Heat problem causes a jack to extend, the system will activate the Store mode automatically and the offending jack will then retract and there will be no dash area indication of this.
The OP's problem is low fluid in the reservoir or a defective float switch. His year/model has Powergear HYD jacks. Most common is low fluid level OR the jacks are NOT fully retracted but look like they are. IF his jacks have the Grease Zirc on the bottom collar on each jack he needs to insert grease with a grease gun. This helps the PG jacks retract easier and fully. Doug