Enerpac LPL-Series, Инструкция

Страница: 5 / 8

5
OK
OK
Figure 4, Cylinder Base Support
OK
Rough and
unstable surface
Flat and stable
surface with one-piece
steel plate
OK
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 LPL-Series cylinders are equipped with
a 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, 8.2 and 8.3 of this manual.
8.1 Operating Precautions
WARNING
Failure to observe the following instructions and
precautions could result in serious personal injury, oil
leakage and/or property damage.
• LPL-Series cylinders are NOT equipped with a stop ring. Use
these cylinders only in the vertical position with the plunger
pointing upwards.
• Advance the plunger slowly. Immediately stop advancing
the plunger if the maximum stroke indicator appears or if
any oil begins flowing from the plunger stroke limiter port.
• Use extreme caution when using high oil flow pumps with
LPL-Series cylinders. The plunger may advance more
quickly than expected.
• Stay clear of pinch point area between lock nut and cylinder
base at all times (refer to Section 2.3 for additional details).
NOTICE
It is mandatory that the operator has a full
understanding of all instructions, safety precautions and
applicable safety regulations before operating any high force
hydraulic equipment. If questions or concerns, contact your
local Enerpac Distributor or Authorized Service Center.
8.2 Maximum Stroke Indicator Line and Plunger
Stroke Limiter Port
The cylinder plunger contains a maximum stroke indicator line.
When this line becomes visible, the plunger has reached its
maximum allowable stroke. See Figure 5, item A.
The plunger stroke limiter port (or
“ overflow port ” ) is located
near the top of the cylinder base. This port is a safety feature,
designed to vent hydraulic oil from the cylinder if the plunger
exceeds the cylinder's maximum allowable stroke. See Figure
5, Item B.
A
B
Figure 5, Maximum Stroke Indicator Line (A) and
Plunger Stroke Limiter Port (B)
WARNING
Failure to observe the following instructions and
precautions could result in catastrophic failure, erratic
operation, high pressure oil leakage and/or damage to
cylinder. Death or serious personal injury could result.
STOP advancing the plunger immediately. . .
• If the maximum stroke indicator line becomes visible.
• If oil flow occurs at the plunger stroke limiter port.
Advancing the cylinder an additional amount could result in
the plunger being hydraulically ejected from the cylinder base,
especially if the plunger is advanced quickly.
The plunger stroke limiter port contains a specially designed
orifice fitting. Never cover or obstruct the orifice fitting passage.
Never operate the cylinder with the orifice fitting removed.
Never install a pipe plug or any other hydraulic fitting in place
of the orifice fitting.
8.3 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 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, using a tommy bar of the appropriate diameter.
To retract: Be sure that the locknut has been loosened a
sufficient amount of turns, so that the plunger can be retracted