Enerpac VM33VAC User manual

POWERFUL SOLUTIONS. GLOBAL FORCE.
Instruction Sheet
VM33VAC, VM33MVAC
Manually-Operated, Vacuum-Assisted Control Valves
L4217 Rev. A 08/17
WARNING: DO NOT USE ENERPAC VM33VAC
OR VM33MVAC VALVES WITH A DOUBLE-
ACTING CYLINDER.
1.0 RECEIVING INSTRUCTIONS
IMPORTANT: Visually inspect all components for shipping
damage. Shipping damage is not covered by warranty. If
shipping damage is found, notify carrier at once. The carrier is
responsible for all repair and replacement costs resulting from
damage in shipment.
2.0 SAFETY
Read all instructions, warnings and cautions
carefully. Follow all safety precautions to avoid
personal injury or property damage during
system operation. Enerpac cannot be responsible
for damage or injury resulting from unsafe product use, lack
of maintenance or incorrect product and/or system operation.
Contact Enerpac when in doubt as to the safety precautions
and operations. If you have never been trained on high-
pressure hydraulic safety, consult your distributor or service
center for information about an Enerpac Hydraulic Safety
Course.
Failure to comply with the following cautions and warnings
could cause equipment damage and personal injury.
A CAUTION is used to indicate correct operating or
maintenance procedures and practices to prevent damage
to, or destruction of equipment or other property.
A WARNING indicates a potential danger that requires correct
procedures or practices to avoid personal injury.
A DANGER is only used when your action or lack of action
may cause serious injury or even death.
sgls.eps
WARNING: Wear proper personal protective gear
when operating hydraulic equipment.
undr.eps
WARNING: Stay clear of loads supported by
hydraulics. A cylinder, when used as a load lifting
device, should never be used as a load holding
device. After the load has been raised or lowered, it must
always be blocked mechanically.
®
®
blkd.eps
WARNING: USE ONLY RIGID PIECES TO HOLD
LOADS. Carefully select steel or wood blocks that are
capable of supporting the load. Never use a hydraulic
cylinder as a shim or spacer in any lifting or pressing
application.
DANGER: To avoid personal injury keep hands
and feet away from cylinder and workpiece
during operation.
Dexceed.eps
WARNING: Do not exceed equipment ratings. Never
attempt to lift a load weighing more than the capacity
of the cylinder. Overloading causes equipment failure
and possible personal injury. The cylinders are designed for a
max. pressure of 10,000 psi [700 bar]. Do not connect a jack
or cylinder to a pump with a higher pressure rating.
WARNING: Never set the relief valve to a higher
pressure than the maximum rated pressure of the
pump. Higher settings may result in equipment
damage and/or personal injury.
gge.eps
WARNING: The system operating pressure must not
exceed the pressure rating of the lowest rated
component in the system. Install pressure gauges in
the system to monitor operating pressure. It is your window to
what is happening in the system.
hosbnd.eps
CAUTION: Avoid damaging hydraulic hose. Avoid
sharp bends and kinks when routing hydraulic hoses.
Using a bent or kinked hose will cause severe back-
pressure. Sharp bends and kinks will internally damage the
hose leading to premature hose failure.
WARNING: MAKE SURE ALL HYDRAULIC
CONNECTIONS ARE MADE TO THE PROPER
PORTS.
Repair Parts Sheets for this product are available from the
Enerpac website at www.enerpac.com, or from your nearest
Enerpac Authorized Service Center or Enerpac Sales oce.
Index:
1.0 Receiving Instructions ................................................1
2.0 Safety...........................................................................1
3.0 General Information ....................................................2
4.0 Installation ...................................................................2
5.0 Operation.....................................................................2
6.0 Troubleshooting ..........................................................3
7.0 Maintenance................................................................3
8.0 Hydraulic System........................................................3
9.0 Storage ........................................................................3
10.0 Diagrams......................................................................4
VM33VAC
(Plastic Handle)
VM33MVAC
(Metal Handle)

2
®
drag.eps
Do not drop heavy objects on hose. A sharp impact
may cause internal damage to hose wire strands.
Applying pressure to a damaged hose may cause it
to rupture.
IMPORTANT: Do not lift hydraulic equipment by the
hoses or swivel couplers. Use the carrying handle or
other means of safe transport.
CAUTION: Keep hydraulic equipment away from
flames and heat. Excessive heat will soften packings
and seals, resulting in fluid leaks. Heat also weakens
hose materials and packings. For optimum performance do not
expose equipment to temperatures of 150°F [65°C] or higher.
Protect hoses and cylinders from weld spatter.
inject.eps
DANGER: Do not handle pressurized hoses. Escaping
oil under pressure can penetrate the skin, causing
serious injury. If oil is injected under the skin, see a
doctor immediately.
bdyhit.eps
WARNING: Only use hydraulic cylinders in a coupled
system. Never use a cylinder with unconnected
couplers. If the cylinder becomes extremely overloaded,
components can fail catastrophically causing severe
personal injury.
®
stblty.eps
WARNING: BE SURE SETUP IS STABLE BEFORE
LIFTING LOAD. Cylinders should be placed on a flat
surface that can support the load. Where applicable, use
a cylinder base for added stability. Do not weld or
otherwise modify the cylinder to attach a base or other support.
Avoid situations where loads are not directly centered
on the cylinder plunger. O-center loads produce
considerable strain on cylinders and plungers. In
addition, the load may slip or fall, causing potentially
dangerous results.
Distribute the load evenly across the entire saddle
surface. Always use a saddle to protect the plunger.
IMPORTANT: Hydraulic equipment must only be
serviced by a qualified hydraulic technician. For repair
service, contact the Enerpac Authorized Service Center
in your area. To protect your warranty, use only Enerpac oil.
sman.eps
WARNING: Immediately replace worn or damaged
parts with genuine Enerpac parts. Standard grade parts
will break causing personal injury and property damage.
Enerpac parts are designed to fit properly and withstand high
loads.
3.0 GENERAL INFORMATION
The Enerpac VM33VAC and VM33MVAC control valves
incorporate the following features in a single unit design:
• 10,000 psi [700 bar] operating pressure
• Vacuum-assisted return (single-acting cylinders only)
• User adjustable relief valve
• Gauge ports
These Enerpac valves are specifically designed for use with
Enerpac pumps.
3.1 Capacity
Capacity is 900 cu. in/min [14.8 l/min], equivalent to
approximately 3.9 gallons per minute.
4.0 INSTALLATION
CAUTION: If you are not trained and familiar with
installing a control valve have an Enerpac Authorized
Service Center perform this procedure.
WARNING: DO NOT USE THESE VALVES WITH A
DOUBLE-ACTING CYLINDER.
1. Install valve onto Enerpac pump using gasket and fasteners
included. Torque fasteners to 16-19 ft-lbs [21.7-25.8 Nm].
Take needed steps to ensure pump’s pressure tube o-ring
and backup are not damaged. Verify tank return tube is
installed to the valve.
2. Install pressure gauge, if required, into proper port.
Pressure can be monitored at the “GP” ports, the “GB” port
or the “GA” port or any combination of these, depending on
system requirements.
CAUTION: If using pipe sealants on male pipe threads,
use sparingly and never over ends of fittings where it
can be torn loose and get into the hydraulic system.
5.0 OPERATION
1. Connect and secure hoses and cylinders noting that the
proper ports are connected.
2. Quick disconnects must be fully engaged and locking
collars drawn up fully to ensure free flow of oil between
valve and attached component.
3. Place valve handle in proper position before starting
pump. Tandem centered valves should be in the NEUTRAL
position.
5.1 Operation
1. Advance
2. Retract
3. Neutral
1
3
2
A
• VM33VAC and VM33MVAC valves will lower or drop the
load during handle movement. The amount of pressure
loss or load movement will depend on the speed of handle
movement between detent positions.
1
2
3
A
Figure 1, Advance, Retract and Neutral
VM33VAC VM33MVAC

3
• VM33VAC and VM33MVAC valves are equipped with an
integral system check valve. To “hold” load, keep valve
handle in position and simply turn pump o. Rotate handle
to lower load.
NOTE: VM33VAC and VM33MVAC are tandem center
valves, which allow oil flow from the pump to tank when
in the NEUTRAL position.
5.2 Relief Valve Adjustment
Z-Class pumps are equipped with one user adjustable relief
valve (see Figure 2). It can be adjusted as follows:
1. Install a gauge on the pump. If a unit is equipped with
optional pressure transducer, verify “SET PRES” value is
higher than desired relief valve setting or Auto Mode is o.
2. Start the pump to allow the oil to warm.
3. Loosen the set screw locking nut.
4. Shift the 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 obtain an accurate setting, decrease the
pressure to a point below the final setting and then slowly
increase the pressure until it reaches the final setting.
5. Tighten the locking nut when the desired pressure is set.
6. Shift the valve to the neutral position, allowing the system
pressure to return to zero (0) psi/bar.
7. Recheck the final pressure setting by shifting the valve and
pressurizing the system.
6.0 TROUBLESHOOTING
1. If the system will not build pressure, check relief valves
in pump for proper setting (refer to pump repair sheet).
Check and secure all hose connections. If trouble is not
corrected by this action, remove cylinder and hoses from
valve. Now place a 10,000 psi [700 bar] gauge directly
in valve port “A” and place the valve in ADV position. If
pressure cannot be developed, the unit should be taken to
the nearest Enerpac authorized service center. If pressure
develops, the problem is located in the cylinder, hoses, or
couplers.
2. Slow retract speed of a single acting cylinder may be the
result of the return pipe (item 75) is not installed. Make
sure that item 75 is installed to the tank return port under
the valve manifold (item 52). Using a hose with a larger
inside diameter or using or a shorter length hose (between
the valve and the cylinder) will improve cylinder retract
speed.
3. Refer to Repair Parts Sheet L4218 for more detailed
troubleshooting information.
7.0 MAINTENANCE
1. Periodically check all hydraulic and air 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.
Refer to the pump oil filling instructions for complete
information.
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.
8.0 HYDRAULIC SYSTEM
1. Keep all hydraulic components free of dirt, grease, chips,
etc.
2. Keep the hydraulic component operating in areas that are
uncluttered and free of unnecessary equipment.
3. Periodically check the hydraulic system for possible
loose connections, leaks, etc. Replace or properly repair
damaged or leaking hydraulic components immediately.
4. Check hydraulic oil in the hydraulic system every 40 hours
of operation or more frequently in unusually dirty or dusty
areas.
5. Oil temperature must be maintained less than or equal to
150°F [65°C] by use of a heat exchanger or other methods.
9.0 STORAGE
In the event that the unit will 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.
Relief valve body
(DO NOT TURN relief valve body.)
Locknut
Set screw
Figure 2, Relief Valve Adjustment
"A" Port

GA
A
1
V
P
GP
WARNING: DO NOT USE THESE VALVES WITH A
DOUBLE-ACTING CYLINDER.
10.0 DIAGRAMS
Figure 3, Electrical Schematic, VM33VAC and
VM33MVAC
Figure 4, Hydraulic Connections, VM33VAC
Figure 5, Hydraulic Connections, VM33MVAC
.250-18 NPTF pump
pressure gauge port “GP”
.375-18 NPTF
advance/retract
port
User adjustable relief valve
.250-18 NPTF pump
pressure gauge port “GA”
.375-18 NPTF
auxiliary tank
return “T”
.250-18 NPTF pump
pressure gauge port “GP”
.375-18 NPTF
advance/retract
port
User adjustable relief valve
.250-18 NPTF pump
pressure gauge port “GA”
.375-18 NPTF
auxiliary tank
return “T”
www.enerpac.com