Enerpac VM43-LPS Manual De Instrucciones página 4

4. Rotate the control valve handle to the neutral/hold
("3") position (see Figure 1 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 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
reached, lock the setscrew with the locknut.
DO NOT overtighten.
Problem
System will not build
pressure.
The stressing cylinders will
not hold the load when
the valve is in the hold or
center position.
The stressing cylinders
are pressure locked in the
tensioning position.
Power seating/retract
pressure not limited to
6,500 +/-500 psi
[448 +/-35 bar].
All manuals and user guides at all-guides.com
pressure setting
TROUBLESHOOTING TABLE
Possible Cause
1. Loose coupler or hose connection.
2. Relief valve set too low.
3. Defective cylinder, hose, or coupler.
Remove cylinder and hose and
check for pressure at "A" port using
a pressure gauge.
This may indicate a worn valve seat,
worn metal seals and mating disk,
worn or damaged static o-rings and
backup rings.
1. The retract-side pressure requires
adjustment.
2. Locking valve requires repair.
The retract-side pressure requires
adjustment.
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.
7.0 TROUBLESHOOTING
(see Troubleshooting Table)
8.0 MAINTENANCE
1. Periodically check all hydraulic connections to be
sure they are tight. Loose or leaking connections
may cause erratic and/or total loss of operation.
Replace or repair all defective parts promptly.
2. Periodically check the hydraulic oil level in your
system.
3. Change hydraulic oil approximately every 250-300
hours of operation. In dusty or dirty areas, it may
be necessary to change the oil more frequently.
9.0 STORAGE INSTRUCTIONS
In the event that the unit would be stored for any great
length of time (30 days or more), prepare as follows:
1. Wipe the entire unit clean.
2. Disconnect all hydraulic lines to prevent accidental
operation.
3. Cover the unit with some type of protective cover.
4. Store in a clean, dry environment that is NOT
exposed to extreme temperatures.
is
1. Check and secure all hose
connections.
2. Adjust relief valve per section 6.0.
3. If pressure builds, replace cylinder/
hose/or coupler. If no pressure
builds, take pump to an authorized
Enerpac Service Center.
Take pump to an authorized Enerpac
Service Center.
Contact an authorized Enerpac
Service Center.
Contact an authorized Enerpac
Service Center.
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Solution