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Instruction Manual
Compact EHA
Bulletin HY22-3200B
Parker Hannifin
Oildyne Division
Maintenance and Troubleshooting
Maintenance
Maintenance should only be conducted when units are
disconnected from their power supply.
Maintaining Proper Oil Temperature
Hot oil in your equipment’s hydraulic system is one of the
primary causes of poor operation, component failure and
downtime. Here are some pointers on maintaining proper oil
temperature.
1. The oil in your hydraulic system was designed for operation
within a specied temperature range. You may be able
to run it at hotter temperatures for short periods of time,
intermittently, without adverse effects.
2. “Hot oil” is a relative term. In most cases, 49°C (120°F) at the
reservoir is considered an ideal operating temperature.
3. Keep your equipment clean. A thick layer of dirt acts as
insulation. It will prevent the hydraulic system from getting rid
of heat.
Measuring Oil Temperature
Because your machine does not have a reservoir thermometer,
use the “palm test”. The reservoir is located adjacent to the
motor. First check the reservoir with your ngertip; if it’s not too
hot to touch, place your palm on the reservoir. You’ll be able to
hold it there without discomfort if the oil temperature is about
55°C (130°F) or below.
Recommended Spare Parts
There are no recommended spare parts for the EHA as it is a
sealed unit. Any warranty repair would be done at the Oildyne
Division.
Troubleshooting
The information provided in this section will provide some ideas
on how to resume normal operation given certain conditions.
Troubleshooting Areas
Unit fails to operate
1. Power source is not charged – recharge.
2. Amperage from power source is not sufcient to operate
unit – use power supply with adequate Amperage to
operate EHA.
3. Wiring harness from EHA motor is not securely fastened
to power source or wiring – tighten connections to power
source.
4. Motor has failed due to higher or more frequent duty cycle
than the unit was intended for – replace unit.
5. Motor has run for an extended time and the internal thermal
breaker tripped.
Unit slows during operation
1. Voltage from power source has changed – examine power
supply for source of varying Voltage.
2. Unit is stalling due to high loads– reduce load against unit
to the forces prescribed in the specications.
3. Unit is mis-aligned and is causing side loading – cease
operation until alignment is corrected.
4. The load is increased on the unit – this is to be expected.
Unit makes excessive noise
1. Operating temperature too low – operate EHA above -34°C
(-30°F).
2. Unit is mounted in the wrong orientation – cease operation.
Contact the factory.
Speed of unit varies during operation
Unit is being used with higher or lower Voltage than for which
it is designed (12 VDC or 24 VDC) – cease operation. Use unit
with power source of appropriate Voltage.
Rod stops moving
1. Power source has become disconnected – reconnect
power source.
2. Motor thermal breaker has been tripped due to high
temperature in the motor, causing motor to stop – allow
motor to return to ambient temperature and restart
operation.
Overheating of unit
1. Continuous operation at relief setting – cease operation.
Allow the unit to return to ambient temperature before
resuming operation.
2. Stalling under load – cease operation. Ensure loads being
moved are within the prescribed specications outlined in
this manual.
3. Improper air circulation around reservoir – relocate unit to
area in assembly that will provide adequate air circulation
to maintain the operating temperature range of -34°C to
+65°C (-30°F to 150°F).
4. EHA operating in direct sunlight or ambient temperature
is too high – move unit to location that will be lower than
the specied maximum operating temperature of +65°C
(+150°F).
5. EHA operating at a continuous duty cycle – cease
operation. Discontinue use until required operation of the
unit will fall within the duty cycle characteristics illustrated
in Figure 7.
Should the user encounter any other conditions, please
contact your local authorized Parker Oildyne distributor or the
Oildyne Division directly for further information or to arrange for
warranty replacement/repair if within the warranty period.
Conclusive Unit Failure
If the operation of the unit cannot be restored after attempts
at the troubleshooting suggestions listed previously, please
contact your local authorized Parker Oildyne distributor or the
Oildyne Division directly to arrange for warranty replacement/
repair if within the warranty period.
Warning: If motor stops due to thermal
overload, de-actuate the power switch.
Otherwise, when the motor cools, it will
start up again.
The Parker Compact EHA is NOT field
servicable.
Do not attempt to open the EHA unit to
make internal adjustments or repairs;
it will void the warranty on the unit.
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