Enerpac ZUTP-Series - Manual (Page 5)

5
5.5 Depressurizing the System
1. Slowly open the pressure release valve to relieve system
pressure. See Figure 4.
2. Verify that the pump pressure gauge indicates zero (0) psi/bar.
5.6 Circuit Breaker
CIRCUIT BREAKER
Press to Reset
Figure 8, Circuit Breaker
(See Figure 8)
The pump circuit breaker is
located on the pump front
panel, beside the pump jog
button.
In the event of an electrical
overload, the pump circuit
breaker will trip. After
investigating and correcting
the source of the overload,
push the circuit breaker
button to reset.
WARNING: To avoid injury and equipment damage, do
not continue pressurizing hydraulic tools after they
reach maximum travel or maximum operating pressure.
6.0 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
qualifi ed electrician, adhering to all applicable local and national
codes.
WARNING: Disconnect pump from electrical power
before performing any maintenance or repairs. Be sure
all hydraulic pressure is completely relieved (0 psi/bar).
6.1 Check Oil Level
Check the pump oil level prior to start-up. If oil level is low,
remove the oil fi ll plug from the cover plate and add oil as needed.
See fi gures 2 and 3. Always be sure that hydraulic tools are fully
retracted before adding oil to the reservoir.
6.2 Change Oil and Clean Reservoir
Enerpac HF oil is a crisp blue color. Frequently check oil condition
for contamination by comparing pump oil to new Enerpac oil. As
a general rule, completely drain and clean the reservoir every 250
hours, or more frequently if 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. Disconnect pump from electrical power.
2. Remove the drain plug and drain all oil from the reservoir.
Clean and reinstall the drain plug.
3. 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 oil intake fi lter screen.
4. Thoroughly clean the reservoir with a suitable cleaning agent.
5. Remove the oil intake fi lter 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.
6. Reassemble the pump and reservoir, installing a new reservoir
gasket.
7. Disassemble the hydraulic return line fi lter. Clean and
reinstall (or replace) the fi lter element. Refer to Section 6.3 for
additional information.
8. Fill the reservoir with clean Enerpac HF hydraulic oil. The
reservoir is full when oil level is as shown in Figure 2.
6.3 Hydraulic Return Line Filter (See Figure 9)
Remove and inspect the hydraulic return line fi lter element at
every oil change. The element can be cleaned and reused if it is
in good condition. However, a new element should be installed if
the old element is damaged or has been cleaned more than three
times.
OIL OUT OIL IN
Note: For additional information,
go to
www.arrowpneumatics.com.
2
3
1
4
5 6
7
Key:
1. End Cap
2. O-Ring
3. Spring
4. Housing
5. Spring
6. Element, 90 Micron (Arrow P/N EK9052V-90)
7. Gasket
Figure 9, Hydraulic Return Line Filter
6.4 Motor Brush Replacement (See Figure 10)
To prevent motor damage, the pump 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 defl ecting the brush cap latch
(B) and gently prying outward. See Figure 10.
3. Remove motor brushes by turning black cap counter-
clockwise.
4. Replace both brushes and reverse procedure to reassemble.
A
B
Figure 10, Brush Cap Removal
A. Brush Cap B. Brush Cap Latch