C & C Hydraulics T: 01535 617880 E:[email protected]

DC Power Unit Owners Manual

Rev. A 1 Rev. A 2 8. Single Acting Power unit For example: YBZ6-F2.7B1A2/WUUAN1/RC

Outline drawing:

Description:

Rev. A 3 Rev. A 4 9. Troubleshooting

Symptoms Possible Cause Correction Special Notes Dead or Low Battery Load test battery Charge or replace battery Ground battery directly to DC Use jumper cables to jump Poor Ground motor ground only Cleaning contacts with Clean contact in hand control Dirty Contacts in Hand Control abrasive will cause frequent with eraser failure System Inoperative Corrosion on Battery Inspect battery cables & clean Use of dielectric grease will Terminals battery terminals prevent corrosion buildup Start Solenoid Failure Jump Start Solenoid Replace Solenoid If motor doesn't run after bypassing start solenoid, Rust in DC Motor Bypass Start Solenoid remove rear cover of motor for quick inspection.

Rev. A 5 Symptoms Possible Cause Correction Special Notes Low Battery/ Poor Ground Load test battery Charge or replace battery Remove coil from directional Replace diodes inside hand valve & operate unit. Only 1 control if 2 coils are **Bad diode in hand control valve coil should operate at a operating when pressing up time. or down button. Cleaning contacts with Clean contact in hand control Dirty Contacts in Hand Control abrasive will cause frequent with eraser failure Replace valve if stem is Check for bent valve stem bent Double check you are Ensure coil is energizing getting power to coil before replacing Remove valve and inspect Replace o-rings if damaged o-rings Check cross drilled holes **Directional Valve Issue between o-rings of valve for Replace valve if spool is not debris shifting Ensure valve is shifting (for most directional valves (use dipstick push on valve the spool will cover half of Motor Runs Load Not or the cross drilled holes when Cylinder not Extending spool to shift valve. Look through cross drilled holes valve is at its at rest or between o-rings insuring valve activated positions) is shifting) *Remove check valve & activate motor momentarily to prime. Replace gear pump if Pump Not Priming **Remove check valve plug & problem is not solved activate motor momentarily to prime Double check with If relief valve is bypassing equipment manufacturer check pressure gage to insure Relief Valve insuring the manufacturer valve is set at proper setting as did not adjust pressure marked on power unit setting at factory.

**Check to see if fluid is passing through the rod seals Rebuild or replace the to tank cylinder if fluid is passing Cylinder * Check to see if fluid is coming through the cylinder without out vent on rod end of cylinder moving the rod when fully retracted

Rev. A 6 Symptoms Possible Cause Correction Special Notes Dead or Low Battery Load test battery Charge or replace battery Ground battery directly to DC Use jumper cables to jump Poor Ground motor ground only

Insure power is getting to coil, check all electrical connections and check for magnetism

Check ground wire or valve stem. For loose connections or corrosion. (If coil is single wire Replace coil if you are Coil on Solenoid Valve not lead, check the contacting getting power to the coil but Activating point where solenoid rests on it is not energizing. valve stem for corrosion)

Loose wire in quick connector or control box

Clean contact in hand control with eraser Inspect stem on solenoid valve (*Single Acting) (DO NOT REMOVE VALVE Replace valve if stem is Cylinder Not Retracting Bent stem on solenoid valve FOR INSPECTION IF bent SYSTEM IS UNDER PRESSURE) Remove load holding valve. Inspect screen & valve for Load holding valve is below Debris in screen of load debris. (DO NOT REMOVE fluid level. Removing this holding valve VALVE FOR INSPECTION IF valve will partially drain SYSTEM IS UNDER reservoir. PRESSURE) Top of valve is threaded, Remove flow control valve & Debris in flow control valve use 1/4-20 bolt to remove inspect valve for debris. flow control valve. Fluid coming out vent on rod Replace cylinder end of cylinder Contact equipment Check cylinder alignment manufacturer if this is an Cylinder issue issue

Contact equipment Packing in cylinder may have manufacturer for failed replacement cylinder

Rev. A 7 Symptoms Possible Cause Correction Special Notes

Add fluid to reservoir when Low fluid level cylinder is fully retracted Before running power unit Reservoir Overflows insure all air bubbles have Remove reservoir & tighten or When Lowering Loose Inlet dissipated to prevent further replace inlet tube on pump aeration of fluid Consult equipment Reservoir too small for manufacturer for correct hydraulic system reservoir size

Symptoms Possible Cause Correction Special Notes Dead or Low Battery Load test battery Charge or replace battery Ground battery directly to DC Use jumper cables to jump Poor Ground motor ground only Replace valve if stem is Check for bent valve stem bent Check cross drilled holes between o-rings of valve for Replace valve if spool is not debris shifting Directional valve not (for most directional valves completely shifting** Ensure valve is shifting (use dipstick push on valve the spool will cover half of spool to shift valve. Look the cross drilled holes when through cross drilled holes valve is at its at rest or between o-rings insuring valve activated positions) is shifting)

Unit Struggles to Lift Load Use dipstick on power unit Remove load holding valve. to manually shift the valve. Inspect screen & valve for This is accomplished by Debris in screen of load debris. (DO NOT REMOVE inserting the dipstick in the holding valve VALVE FOR INSPECTION IF nose of the valve and SYSTEM IS UNDER applying pressure. Replace PRESSURE) valve if it doesn't shift.

If motor doesn't run at a higher RPM after bypassing Rust in Motor Bypass Start Solenoid start solenoid, remove rear cover of motor for quick inspection. Packing on piston of cylinder Have cylinder tested by Worn seals in cylinder could be bad and be wedged certified technician against bore of cylinder.

Rev. A 8