BVA Hydraulics HD10018 - Manual (Page 5)

5
OPERATION
Operate the hydraulic pump to advance and retract the
cylinder. Do not continue pumping when cylinder is fully
extended or retracted. Internal pressure will build up and
may damage the seal of the cylinder.
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.
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.
All personnel must be clear before lowering load.
MAINTENANCE
1. Inspect hoses and connections daily. Replace damaged
components immediately with BVA Hydraulics
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
DTE13M or equivalent when using with hand pump or air
pump; BVA Hydraulics Oil (F01) 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.
Important: 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 is to force the air bubbles up hill
and back to the 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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