Enerpac HCRL-10010, Instruction Sheet

Page: 5 / 12

5
CAUTION Use of HCRL-Series cylinders on surfaces
such as sand, mud or dirt may result in loss of load and/
or damage to cylinder.
Base mounting holes are provided on all models. Refer to
sections 12.1 and 12.2 for mounting hole locations and
dimensions. Mounting bolts are not included with the cylinder
and must be provided by the user.
7.0 AVOIDING SIDE LOAD
Plan ahead to eliminate the presence of side load forces (offset
loading) when using hydraulic cylinders. Side load can occur
as a result of one or more of the following conditions:
• An eccentric load on the plunger. • A horizontal load on a
structure. • A shifting center of gravity. • Structure and/or cylinder
misalignment. • Non-synchronized lifting actions. • Non-stable
cylinder base support.
It is understood that some side load will occur in many lifting
situations. However, the user should do everything possible to
minimize or eliminate this condition.
The possibility of side load can be reduced by ensuring that
the cylinder base is located on a flat and hard surface, capable
of supporting the cylinder and the load without settling.
To help reduce the effects of minimal side load that cannot
be eliminated, all HCRL-Series cylinders are equipped with an
integral tilt saddle. The tilt saddle helps compensate for initial
misalignment of the load and the saddle surface. It reduces
saddle edge loading, which can result in an undesirable off-
center load being applied to the plunger.
8.0 OPERATION
Operation procedures will vary, depending on hydraulic pump
type, valve configuration and other factors. For detailed
operating instructions and related information, refer to the
instruction sheet included with your pump. Also follow the
additional instructions and precautions contained in sections
8.1 and 8.2 of this manual.
If using multiple HCRL-Series cylinders: Without load, verify
that all plungers advance and retract in the same direction
when the control valve is shifted. If necessary, relieve pressure
and properly reconnect any reversed hydraulic hoses.
8.1 Operating Instructions
WARNING To prevent serious personal injury, keep
hands, fingers and other body parts clear of pinch point
area between lock nut and cylinder base during cylinder
operation (refer to Section 2.3 for additional details). Be
certain that plunger is not moving when tightening or
loosening lock nut.
To advance:
Operate pump and valve so that pressurized oil
flow is directed in a controlled rate from the pump reservoir to
the cylinder advance coupler.
To hold the load: Tighten the lock nut until it is snug against the
top edge of the cylinder base. This will mechanically prevent
the plunger from retracting when hydraulic pressure is relieved.
To loosen lock nut: Advance the plunger about 1/4 inch [6
mm] to remove any weight from the lock nut. Then, loosen the
lock nut the desired number of turns, using a tommy bar of
appropriate diameter.
To retract: Be sure that the locknut has been loosened a
sufficient amount of turns, so that the plunger can be retracted
the desired amount. Then, operate pump and valve so that
pressurized oil flow is directed from the pump reservoir to
the cylinder retract coupler. Note that additional hydraulic
components may be required to control the rate at which the
plunger retracts under load.
8.2 Retract Side Safety Relief Valve
HCRL-Series cylinders include a retract side safety relief valve.
It is located near the bottom of the cylinder base. See Figure
2, item 6.
The valve is designed to relieve retract chamber pressure in
the event that hydraulic flow is directed to the advance side
of the cylinder while the retract side hose is disconnected. It is
factory set at approximately 862-896 bar [12500-13000 psi].
WARNING Do not remove, alter or disable the retract
side safety relief valve. Do not readjust the valve setting.
Failure to observe this instruction may result in possible
catastrophic failure of the cylinder. Serious personal injury
could result.
9.0 INSPECTION, MAINTENANCE & STORAGE
• Periodically check the hydraulic system for loose
connections leaks and obvious problems. Replace any
damaged components immediately.
• Monitor the hydraulic oil temperature during operation. Do
not exceed oil temperatures above 150°F [65°C].
• Install dust caps and plugs on all hydraulic couplers after the
hydraulic hoses are disconnected from the cylinder.
• Keep all hydraulic components clean.
• Periodically check the tilt saddle for free movement. If
required, disassemble, clean and lubricate the tilt saddle.
Use white lithium grease.
• Change the hydraulic oil at the recommended interval shown
in the pump instruction sheet. Change the oil immediately if
contamination is suspected.
• Store cylinders in the vertical position, in a clean, dry and
secure location. Keep stored cylinders and hoses away from
heat and direct sunlight.
• If repairs are required, refer to the Enerpac website for the
repair parts sheet applicable to your cylinder model.
NOTICE
Hydraulic equipment must only be serviced by a
qualified hydraulic technician. For repair service, contact the
Enerpac Authorized Service Center in your area.
10.0 RELIEVING TRAPPED PRESSURE
Hydraulic pressure can sometimes become trapped within
a hydraulic cylinder. This condition can occur in both single
and double-acting cylinders, but is most likely to happen in
a double-acting cylinder that has been exposed to changing
ambient temperatures.
A common indication of trapped pressure is when mating hose
and cylinder couplers will not engage, or are unusually difficult
to engage.
If a trapped pressure condition is suspected, always use the
Enerpac model CT-604 coupler bleed tool (available from your
Enerpac distributor) to safely relieve any remaining pressure.
WARNING Never attempt to relieve trapped hydraulic
pressure within the cylinder by loosening a coupler on the
cylinder base.
Trapped hydraulic pressure can cause a loosened coupler
to dislodge unexpectedly with great force. Serious
personal injury or death will result if the coupler becomes
a projectile and strikes persons working in the area.
A sudden escape of pressurized hydraulic oil may also
occur if a coupler is loosened while trapped hydraulic
pressure is present. Serious personal injury or death could
result if a high pressure oil stream penetrates the skin.
Use only the Enerpac CT-604 coupler bleed tool to relieve
trapped hydraulic pressure within the cylinder.