Enerpac ZA4T-Series - Manual (Page 5)

5
Increase
Locking Nut
Pull up to
disengage
Decrease
Figure 12, Relief Valve Adjustment
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 hydraulic
wrenches 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).
6.3 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.
6.4 Cleaning the Air-Filter Lubricator
Inspect the air-fi lter lubricator frequently to detect for damage.
Replace damaged bowls.
Keep the fi lter bowl clean to maintain
fi ltering effi
ciency. The unit is equipped
with an automatic drain, which
opens around 3 psig and closes at
approximately 5 psig. (See Figure 13.)
A visible coating of dirt or condensate
on the fi lter element or an excessive air
pressure drop indicates that cleaning
is necessary. Depressurize the unit
before removing bowl for cleaning.
CAUTION: Clean fi lter bowl with
household soap only.
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.
Figure 13
Handle