The 2 side tanks are the reservoir. Did you check the fluid level? Clean out the screen on the fluid intake (right side) to the gear pump (front between your legs)? You can take the hose off and see if fluid is getting to cylinder. Start the machine and let it idle to see if you have flow. Never had this problem so just guessing. The cylinder may have blown seals or end came loose. If you have fluid getting to cylinder then you will know to check it. Maybe Mike10 can give you a better fix. Good luck.