Hardee by EVH
Troubleshooting
DB4048 & DB4060 HYDRAULIC ROTARY CUTTE
16 4/3/09
Troubleshooting Guide
Hydraulic System, Blade System, Pump, Motor, Fluid Lines
Problem Possible Cause Solution / Correction
Cylinder Will Not Operate Oil Flow Restricted
(Flow – Contained System)
Open Gate Valve on Bottom of Hydraulic
Oil Tank
Worn Pump
(Self – Contained System)
Replace Pump
Tractor Remotes not engaged Engaged Remote
Tractor Remote engaged In Reverse Engage Remotes Opposite Way Or
Switch Hydraulic Lines In Tractor
Remotes.
Improper Relief Valve Setting Adjust Relief Valves To Specifications
(Refer To Pages 14)
Head Drifts Back When In
Operation
Cylinder Leakage Repair / Replace Cylinders
Leaking Motor Motor Seal Blown Repair / Replace Seal And Check Filter
For Blockage (Repair / Replace Filter)
Blades Loose Speed In Cutting Improper Relief Valve Setting Check Relief Valve Setting (Refer To
Page 14)
Repair / Replace Relief Valve
Pump Whines Worn Or Damaged Pump Repair / Replace Pump
Improper Oil In System Replace Oil
Requires Hardee Oil Part NO 23333 Or
Comparable Oil With Proper Viscosity
Pressure Setting On Relief Valve Too
Low
Check Relief Valve Setting (Refer To
Page 14)
Motor Whines Worn Or Damaged Motor Repair / Replace Motor
Improper Oil In System Replace Oil
Requires Hardee Oil Part NO 23333 Or
Comparable Oil With Proper Viscosity
Pressure Setting On Relief Valve Too
Low
Check Relief Valve Setting (Refer To
Page 14)
Motor Seal Continually Blows Out Internal Popit Valve Damaged Replace Popit Valves
Unit Vibrates Severely Broken Blade Replace Blades, Blade Bolts And Nuts
(Refer To Page 13)
Blade Holder Loose Repair / Replace Blade Holder (Refer To
Page 13)
Loose Output Shaft Repair / Replace Shaft's Bearings In
Cutter Head Housing
Cutter Head Grinds And Roars
When Operating
Worn Bearings Or Improper Lubrication In
Cutter Hydraulic Motor Housing
Repair / Replace Components (Bearing,
Seals And Housing) As Required
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