Harken HYDRO 2 Power Unit - Manual (Page 19)

Hydro 2 19
Maintenance
Leakage Inspection
After commissioning visually inspect system for leaks. Perform visual leak inspection at regular intervals. It is good practice to visually
inspect for leaks prior to every use.
Cleanliness Inspection
Maintain a dirt-free system. This is very important in applications in environment with a high degree of airborne contaminants.
Leak detection is easier and quicker on clean system.
Oil Level Inspection
Check oil level every 2 to 4 hours during the first day of use. Check oil level twice a day during first week and once a week thereafter.
CAUTION! If necessary, top off oil reservoir using proper fluid type. Do not mix oil types. Refer to Oil Equivalent
Table, pg. 15.
Additional Maintenance Points
• Always power down HPU prior to performing maintenance.
• Place a label or tag on HPU indicating type of fluid that is installed.
• Replace any hoses that appear to be worn or chafed.
Troubleshooting
Problem Possible Cause How to Verify
None of the functions are working
No electrical power
Check power to ECB
Check motor switches on ECB
Check wiring from ECB to motor
Check main circuit breaker to ECB
Check lights on micro circuit breaker. If red, reset circuit breaker.
Motor is not operating
Check thermal switch trip light on ECB
Verify proper voltage at motor
Verify operation of motor relay
Motor is stalling
Pressure relief valve not working
Not enough current going to motor
Pump is not operating correctly
Check oil level in reservoir
Repair pump
Single function is not working
Function is turned off Check function breaker in ECB
Switch is not working Check wiring from deck switch to ECB
Valve is not working
Check wiring from ECB to directional valve
Check lights on micro circuit breakers. If red, reset circuit breaker.
Check operation of directional valve solenoids
Perform manual override with hex wrench
Functions are running slow
System leak present Check hose and fitting connections
Reduced motor speed Verify adequate battery voltage to motor
Relief valve is opening Hydraulic line is plugged
Pump flow is reduced Check oil level in reservoir
Filters are plugged Check filter status gauge. Replace filter element if needed.
Function load reduced
System leak present Check hose and fitting connections
Insufficient motor torque Verify batteries are fully charged
Relief valve is opening Check relief valve opening pressure
Pump is not operating correctly
Check oil level in reservoir
Check system pressure under load
CAUTION! If leak is present, decrease system pressure to 0 psi before tightening fittings.