BVA Hydraulics HLN15002--HLN20012 - Manual (Page 5)

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OPERATION
Operate the hydraulic pump to advance and retract the cylinder.
Do not continue pumping when cylinder is fully extended. If
the cylinder continues to extend beyond the yellow ring on
the ram plunger, a great deal of fluid will be bypassed from
the overflow ports located at the hook lugs (ref. Fig 1). If this
occurs, immediately stop extending the ram plunger, clean up
thoroughly, and refill pump reservoir.
WARNING: To help prevent material fatigue if the
cylinder is to be used in a continuous application, the
load should not exceed 85% of the rated capacity.
WARNING: Your cylinder, hose(s), couplings and pump
all must be rated for the same maximum operating
pressure, correctly connected and compatible with the
hydraulic fluid used. An improperly matched system can
cause the system to fail.
WARNING: All personnel must be clear before lowering
load.
MAINTENANCE
1. Inspect hoses and connections daily. Replace damaged
components immediately with BVA Replacement Parts
only.
2. Tighten connections as needed. Use pipe thread sealing
compound when servicing connections.
3. Always use clean, approved hydraulic fluid and change as
recommended or sooner if the fluid becomes contaminated
(never exceed 400 hours). Follow pump manufacturers
instructions for changing and adding hydraulic fluid. Use
only good quality hydraulic fluid. We recommend Mobil DTE
13M or equivalent when using with hand pump or air pump;
Mobil DTE 15M or equivalent when using with electric pump.
Never use brake fluid, transmission fluid, turbine oil, motor
oil, alcohol, glycerin etc. Use of other than good quality
hydraulic oil will void warranty and damage the cylinder,
pump, hose etc.
4. Use an approved, high-grade pipe thread sealant to seal all
hydraulic connections. Teflon tape can be used if only one layer
of tape is used and it is applied carefully (two threads back) to
prevent the tape from being introduced into hydraulic system.
A piece of tape could travel through the system and obstruct
the flow of fluid and adversely affect function.
Lubrication & Cleaning
Keep cylinder clean at all times.
1. Any exposed threads (male or female) must be cleaned and
lubricated regularly, and protected from damage. Lubricate
with light machine oil.
2. If a cylinder or ram has been exposed to rain, snow,
sand, airborne abrasive, or any corrosive environment, it
must be cleaned, lubricated, and protected immediately
after exposure. Daily clean exposed ram with clean cloth
dampened with light machine oil. Protect exposed ram from
the elements at all times.
3. Keep the hydraulic system as free of dirt as possible. When
not in use, couplers must be sealed with dust covers. All
hose connections must be free of dirt and grime. Any
equipment attached to the cylinder must be kept clean.
Figure 2 - Illustration to bleed air from system
Storage
Cylinders should be stored with ram plunger fully retracted in
a dry, protected area, not exposed to corrosive vapor, dust or
other harmful elements. When a cylinder has not been used
for a period of 4 months, it should be connected to a pump and
fully extended and then retracted a minimum of 5 times. This
cycle will lubricate the cylinder wall, reducing the possibility of
corrosion and damage thereof.
How to remove faulty coupler:
If cylinder does not retract,:
1. Secure load by other means.
2. Depressurize pump and hose.
3. Remove the cylinder from application.
4. Disconnect and replace with new coupler.
NOTICE: Do not attempt to grasp with pliers or wrench
without first wrapping the jaws of such tool with rags or similar
padding.
How to bleed air from system:
1. Lay cylinder on its side and have the couplers facing up.
2. Place pump at a higher elevation than the hose and cylinder
as shown in Figure 2 below.
3. Operate pump to fully extend and retract the cylinder 2 or
3 times, the objective being to force the air bubbles up hill
to pump reservoir.
4. Follow pump instruction manual to bleed the air from pump
reservoir. On most pumps, air can escape by opening the
oil filler screw.
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