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"B"
Port
Locknut
VM43M
only
Figure 12, Relief Valve - VM33M and VM43M
VM43-LPS Only
1.
Install a 0-15,000 psi [0-1,035 bar] gauge in the "A" port (see
Figure 13).
2.
Install a 3/8" pipe plug in the "B" port and torque to 25 ft-lbs
[33 Nm].
3.
Loosen the relief valve locknut to permit adjustment of set
screw.
4.
Rotate the control valve handle to the neutral/hold ("3")
position (see Figure 8 for valve positions).
5.
Start the pump and allow the oil to warm.
6.
Rotate the control valve handle to the advance/stressing ("1")
position. Allow pressure to build.
NOTE: Use a 5mm Allen wrench to adjust the relief valve set
screw.
7.
To increase pressure: With the pump running, SLOWLY turn
the relief valve set screw clockwise until "A" port pressure
increases to the desired setting.
NOTE: A pilot-operated check valve in the locking valve block
will prevent the pressure from dropping when the set screw is
turned counter-clockwise. To lower the pressure setting, follow
the procedure in steps 8a through 8e.
8.
To decrease pressure:
a.
Be sure the pump is running.
b.
Rotate the control valve handle to the retract/seating
("2") position momentarily. This will activate the pilot-
operated check valve and relieve pressure at the "A"
port. Then, rotate the handle to the neutral/hold ("3")
position.
c.
Turn the relief valve set screw counter-clockwise one
turn.
d.
Rotate the control valve handle to the advance/stressing
("1") position.
e.
SLOWLY turn the relief valve set screw clockwise until
"A" port pressure increases to the desired setting.
9.
When the desired pressure setting is reached, lock the set
screw with the locknut. DO NOT overtighten.
10. Before turning off pump, rotate the control valve handle
momentarily to the retract/seating ("2") position to relieve pressure
at the "A" port. Then, rotate the handle to the neutral/hold ("3")
position. Check that "A" port gauge indicates zero (0) psi.
11. Stop the pump.
Relief valve body (DO NOT TURN)
Set screw
Relief valve body
(DO NOT TURN)
"A"
Port
Locknut
Set screw
Figure 13, Relief Valve - VM43-LPS
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 oil fi ll plug. Always be sure cylinders
are fully retracted before adding oil to the reservoir. See fi gures 2
and 4.
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 4.
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
PF-25.
5
"A"
Port
"B"
Port
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