Check Oil Level; Change Oil And Clean Reservoir; Motor Brush Replacement - Enerpac ZU4 Classic Manual Del Usuario

6.0 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 qualifi ed electrician, adhering to all applicable local and
national codes.

6.1 Check Oil Level

Check the oil level of the pump prior to start-up, and add oil, if
necessary, by removing the fi ll port plug. See fi gures 3 and 5.
Always be sure torque wrench is 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: 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. Remove the drain plug and drain all oil from the reservoir.
Clean and reinstall the drain plug.
2. 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 fi lter screen.
3. Thoroughly clean the reservoir and reservoir magnet (if
equipped) with a suitable cleaning agent.
4. Remove the pick-up 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.
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 as shown in Figure 5.

6.3 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 defl ecting the brush cap
latch (B) and gently prying outward (see Figure 12).
3. Remove motor brushes by turning black cap counter-
clockwise.
4. Replace both brushes
reassemble.
B
Figure 12, Brush Cap Removal
A. Brush Cap
7.0 TROUBLESHOOTING
(See Troubleshooting Guide)
Only qualifi ed hydraulic technicians should service the pump or
system components. A system failure may or may not be the
result of a pump malfunction. To determine the cause of the
problem, the complete system must be included in any diagnostic
procedure.
The following information is intended to be used only as an aid in
determining if a problem exists. For repair service, contact your
local Authorized Enerpac Service Center.
6
and reverse procedure
A
B. Brush Cap Latch
to