SECTION 3: INSTALLATION
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VANAIR MANUFACTURING, INC.
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Cap•Start Hydraulic-Driven
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2. Allows for better oil level tolerance level of
the system if vehicle operates at an unusual
(slightly off level) vehicle angle.
3. To keep return fl ow well below the surface so
it does not break the surface and cause aer-
ation (cavitation) of the oil.
3.4.2.3 MANDATORY RESERVOIR
FEATURES
• The reservoir should incorporate the following
design features:
• In terms of location of the reservoir tank within
the hydraulic system, note that the hydraulic
pump’s inlet line (suction line out from the res-
ervoir to the pump) should be located near the
bottom of the tank, well below the oil level. The
suction line should protrude a minimum of two
(2”) inches into the reservoir to keep it away
from potential contaminant surface buildup.
• A baffl e or baffl es should be included to pre-
vent sloshing, or centrifugal motion of the oil;
the goal is to break up direct fl ow of the oil
from the return point to the suction point. This
allows for the cooling action contact with the
tanks’ inner surfaces, and promote separation
of any air or contaminants that interact with
the fl owing oil.
• An ideal baffl e design would position several
(but not too many) baffl es to promote an ‘S’
shape fl ow within the reservoir, as viewed
from above. The area of the end gaps should
be at least twice the area of the suction line
diameter.
• A drain port with plug, situated at the lowest
point of the reservoir, is needed to assure
complete draining. It should be installed using
an adapter or housing which does not pro-
trude above the inner surface of the fl oor of
the tank. It should be visible and accessible
for removal, with suffi cient space available for
catching the waste oil.
• If the return line entrance to the tank is located
near the top, it should be extended downward
within the tank to minimize foaming and aer-
ation of the circulating oil. This extends oil in-
tegrity, which in turn helps to maintain system
performance and reliability.
• An in-line fi lter on the return line is needed to
protect the system against contaminants be-
ing introduced into the oil. The fi lter should be
mounted externally from the reservoir in a lo-
cation that allows for easy of service access.
• A breather and fi ll cap is needed at the oil fi ll
port, which needs to be located above the
system oil level. The breather cap acts to both
fi lter air that is drawn into the reservoir as the
oil level diminishes, and bleeds air out as the
level is regained. This maintains constant at-
mospheric pressure in the air volume within
the reservoir.
• A sight-glass provides a direct visual indication
of the oil level without having to open, or oth-
erwise access, the reservoir.
3.4.2.4 RECOMMENDED RESERVOIR
OPTIONS
Although not essential for an adequately func-
tioning reservoir, the following components will
contribute to maximize the hydraulic system’s ef-
fi ciency and maintain a quality operational level.
• Magnetic drain plug: Attracts and concentrates
ferrous contaminants at the drain plug source
for easier accessibility and removal when
cleaning tank interior.
• A temperature gauge: Located in approxima-
tion to, or built in to, the sight glass assembly
allows for temperature reading at a glance.
• Filler port strainer: Prevents large contaminant
particles from blending with system oil when
adding new oil.
• Return line diff user (splash) plate reduces ve-
locity of oil fl ow before return oil stream merg-
es with the main reservoir oil volume.
• A reservoir heater: For those systems that are
exposed to cold climate ambients, having the
ability to preheat the hydraulic oil prior to start
up will make for easier startups, and reduce
the strain of warming up the system under ad-
verse cold conditions.
3.4.2.5 RESERVOIR FEATURES TO
AVOID
A strainer used to screen the suction line is not
recommended for systems designed for mobile
equipment use. Having equipment that likely ex-
periences long suction lines, cold startups and
non-tracked or infrequent maintenance practic-
es may cause this strainer to potentially promote
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