Jack won't retract - HWH

02. The jack springs, do they taper on both ends the last 2 inches? Or are they the same diameter top to bottom? If Tapered you have the current stronger springs. If they are the same diameter, you need to replace all 4 sets with the new stronger springs. This will NOT fix your problem but will make the jacks retract quicker. Besides the existing springs are 15 years old and are probably rusted and have lost some tensile strength. Your problem, regardless of what others will post is that Jack, the internal seals are bad and cause the jack to not retract smoothly and stick. You can either send it out to be rebuilt or buy a new one from HWH. The fact you can lever it up shows that it is the Internal seals that is the problem. Since the "T" handle on the solenoid is busted, you need to replace that solenoid as you may need to manually release in the future. The new solenoids have a spring loaded release instead of that "T" handle. The fact you added a Quart is a non issue. The system holds over 6 Qts and you only use at most 2 qts when all 4 jacks are fully extended. If the system was EMPTY, the jacks would still retract. Doug