Check Oil Level; Motor Brush Replacement - Enerpac ZU4 T Serie Manual De Instrucciones

received a signal from the pendant button. No signal indicates the
problem is most likely with the pendant keypad or pendant cord. Use
LOCAL mode to operate pump until problem can be corrected. See
QRC step #11.
Screen 19
Press
(See Screen 19.) DIAGNOSE screen with Pendant On/Off (Motor)
button pushed.
Screen 20
Press
(See Screen 20.) DIAGNOSE screen with Pendant Up Arrow (Advance)
button pushed.
6.5 LCD HIDDEN MENUS - AVAILABLE WHEN THE
PRESSURE TRANSDUCER IS INSTALLED
A "Calibration" Menu
Screen 21
SET
CAL PT A
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(See Screen 21.) This screen allows the operator adjust the
pressure value shown on the LCD to match a master gauge. To
access this menu:
Firmware 5.5 and earlier - set AUTOMODE to "ON" and go to the
"Set Press" menu
Firmware 5.6 and later - go to the "UNITS" menu
Then press and hold the ON/OFF button in for 7 seconds, ENTRY
CODE will appear. Then press and hold both Down-Arrow and Up-
Arrow buttons for 7 seconds. See Table 2 "Z-Class Pump
Calibration" for adjustment steps.
DIAGNOSE
10001 PSI
DIAGNOSE
01001 PSI
PSI
7.0 MAINTENANCE
Frequently inspect all system components for leaks or damage.
Repair or replace damaged components. Electrical components,
for example, the power-cord, may only be repaired or replaced by
a qualified electrician, adhering to all applicable local and
national codes.

7.1 Check Oil Level

Check the oil level of the pump prior to start-up, and add oil, if
necessary, by removing the fill port cap. Always be sure cylinders
are fully retracted before adding fluid to the reservoir. See Figure 2.
7.2 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: This procedure requires that you remove the pump from
the reservoir. Work on a clean bench and dispose of used oil
according to local codes.
1. Unscrew the 13 bolts holding the coverplate to the reservoir
and lift the pump unit out of the reservoir. Be careful not to
damage the filter screen.
2. Pour all oil out of the reservoir.
3. Thoroughly clean the reservoir and magnet 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 Enerpac hydraulic oil. The
reservoir is full when oil level is in middle of the sight gauge
(see figure 4).
7.3 Changing the Filter Element (optional)
A return line filter may be ordered as an accessory to the pump. The
filter element should be replaced every 250 hours, or more
frequently in dirty environments. The filter manifold is equipped with
a 25 psi (1,7 bar) bypass to prevent over pressure rupture if filter
plugging occurs. Filter element replacement part number is PF-25.

7.4 Motor Brush Replacement

To prevent motor damage, the ZU4 motor brushes incorporate an
automatic motor stop when one of the brush carbons wear to a
length of 0.25" [6 mm]. Inspect both brushes.
1. Disconnect pump form 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 reassembly.
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