Cause / 005

1. Air mixed with oil. 2. Oil return tube loose. 3. Oil by-passing. 4. System overfilled. 5. Obstruction in return filter cavity.

Repair / 005

1. A) Change oil to Hydraulic oil. B) Tighten all suction line fittings. 2. Reinstall return tube. 3. Replace relief valve and/or O-rings on pressure side of pump. 4. Bleed cylinders and check oil level. Remove excess oil. 5. remove obstruction and replace filter.