Enerpac ZA4 Serie Hoja De Instrucciones página 4

4. Shift the control valve and build pressure in the system.
Using an Allen wrench, turn the set screw counter-clockwise
to decrease pressure and clockwise to increase pressure.
NOTE: To get an accurate setting, decrease the pressure to
a point below the fi nal setting and then slowly increase the
pressure until it reaches the fi nal setting.
5. Tighten the locking nut when the desired pressure is set.
6. Shift the control valve to the neutral position, allowing the
system pressure to return to 0 psi.
7. Recheck the fi nal pressure setting by shifting the control
valve and pressurizing the system.
Lock Nut
6.0 MAINTENANCE
Frequently inspect all system components for leaks or damage.
Repair or replace damaged components.
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 cap. Always be sure
cylinders are fully retracted before adding fl uid to the reservoir.
See Figure 2.
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. 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.
2. Pour all oil out of the reservoir.
3. Thoroughly clean the reservoir and reservoir magnet 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 in middle of the sight gauge
(see fi gure 4).
Relief valve body (DO NOT TURN relief
valve body.)
Set Screw
Figure 8
6.3 Changing the Filter Element (optional)
A return line fi lter may be ordered as an accessory to the pump.
The fi lter element should be replaced every 250 hours, or more
frequently in dirty environments. The fi lter manifold is equipped
with a 25 psi (1,7 bar) bypass to prevent over pressure rupture
if fi lter plugging occurs. Filter element replacement part number
is PF25.
6.4 Cleaning the Muffl er
When the pump is run for long periods of time, ice may form on
the muffl er element and must be removed. To clean the muffl er,
unscrew and remove any debris.
7.0 TROUBLESHOOTING (see Trouble-shooting
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.
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