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The microcontroller will allow the pump to continue operating at
reduced voltage, provided that no fault conditions occur (See
Section 6.6). The Low Voltage warning will automatically clear
once the low voltage condition has been resolved.
IMPORTANT: Pump operation during a Low Voltage condition
is not recommended. Motor RPM and hydraulic flow will be
reduced. Excessive current draw may cause the pump's internal
circuit breaker to trip, resulting in a Motor Overload fault (See
Section 6.6 D).
7.0 MAINTENANCE
Frequently inspect all system components for leaks or damage.
Repair or replace damaged components. Electrical components,
such as the power cord, may only be repaired or replaced by a
qualified electrician, adhering to all applicable local and national
codes.
WARNING: Disconnect pump from electrical power
before performing any maintenance or repairs.
7.1 Check Oil Level
Check the pump oil level prior to start-up. If oil level is low,
remove the SAE #10 plug from the cover plate and add oil as
needed (See figures 3 and 4). Always be sure torque wrench is
fully retracted before adding oil to the reservoir.
7.2 Change Oil and Clean Reservoir
As a general rule, completely drain and clean the reservoir
every 250 hours, or more frequently if pump is used in dirty
environments.
Note: The following procedure requires that you remove the
pump from the reservoir. Work on a clean bench and dispose of
used oil in accordance with all applicable laws and regulations.
1.
Remove the drain plug and drain all oil from the reservoir.
Clean and reinstall the drain plug.
2.
Unscrew the 13 bolts holding the cover plate to the reservoir
and lift the pump unit out of the reservoir. Be careful not to
damage the filter screen.
3.
Thoroughly clean the reservoir and reservoir magnet (if
equipped) with a suitable cleaning agent.
4.
Remove the pick-up filter screen for cleaning. (Do not pull
on the screen or the bottom of the intake to avoid possible
damage.) Clean the screen with solvent and a soft brush.
Reinstall.
5.
Reassemble the pump and reservoir, installing a new
reservoir gasket.
6.
Fill the reservoir with clean hydraulic oil. The reservoir is full
when oil level is as shown in Figure 4.
7.3 Motor Brush Replacement
To prevent motor damage, the ZU4 motor brushes incorporate
an automatic motor stop when one of the brush carbons wears
to a length of 0.25" [6 mm]. Inspect both brushes.
1.
Disconnect pump from electrical power.
DANGER: To avoid possible electrocution, pump must
be completely disconnected from electrical power
before brush servicing is attempted.
2.
Remove both brush caps (A) by deflecting the brush cap
latch (B) and gently prying outward. See Figure 8.
3.
Remove motor brushes by turning black cap counter-
clockwise.
4.
Replace both brushes and reverse procedure to reassemble.
B
Figure 8, Brush Cap Removal
A. Brush Cap
8.0 INSTALLATION OF ACCESSORIES
• For heat exchanger (optional equipment) installation
instructions, refer to Enerpac instruction sheet L2765.
9
A
B. Brush Cap Latch
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