VIAIR Medium Duty OBA User Manual
MEDIUM DUTY
ONBOARD AIR SYSTEM
PART NO. 10003
IMPORTANT:
It is essential that you and any other operator of this
product read and understand the contents of this manual
before installing and using this product.
SAVE THIS MANUAL FOR FUTURE REFERENCE
USER MANUAL
*Only Compressor
is CE Certied
MEDIUM DUTY ONBOARD AIR SYSTEM
Thank you for purchasing this complete, self-contained onboard air system. Contained in one package,
you’ll nd everything you’ll need to install a high performance, onboard air source for your vehicle.
Please follow these instructions to install your new system.
OBA Components:
1 - 2.5 Gallon, 6 port VIAIR Air Tank
1 - 325C model VIAIR compressor
1 - 36-ft. Length of 1/4” Air Line (for accessory and gauge installation)
(Please check to make sure that you have four labeled packages in your Onboard Air System kit. Each package
contains the parts needed for specic areas of onboard air installation, and may contain smaller bags within
each package labeled for specic use.)
PARTS PACKAGES
Package #1 – Air Tank Installation:
A
BLCMD
F
G H I
E Z AA
J
A. Mounting Bolts (4pcs)
B. Flat Washers (8pcs)
C. Locking Washers (4pcs)
D. Nuts (4pcs)
E. Rubber Tank Mount Bushings (6pcs)
F. 1/4” NPT Drain Cock (1pc)
G. 1/4” NPT 175 PSI Safety Valve (1pc)
H. 1/4” NPT Compression Fitting (1pc)
I. 1/4” NPT M Quick Connect Coupler (1pc)
J. 1/4” NPT F Quick Connect Stud (1pc)
Package #2 – Compressor Installation:
K
N O P Q
R S T
U
V
W
X
Y
K. Mounting Bolts (4pcs)
L. Flat Washers (8pcs)
M. Locking Washers (4pcs)
N. Nuts (4pcs)
O. Remote Mount Air Filter Assembly (1pc)
P. Remote Mount Air Filter Fittings for
Compressor and Air Filters (2pcs)
Q. 2-pack of Replacement Air Filters (1pc)
R. Leader Hose Bracket Clip (1pc)
S. Air line for Remote Mounting Air Filter (1pc)
T. 4-inch Strip of continuous Grommet Material (1pc)
U. Fuse Holder & 20 ft. 12 Gauge Wire (1pc)
V. 20-amp Fuse (1pc)
W. 12-gauge Ring Terminal (1pc)
X. 12-gauge Butt Connector (1pc)
Y. Self-tapping Screw (1pc)
Package #3 – Pressure Switch & Reducer:
Z. Pressure Switch with Relay (110 PSI on, 150 PSI off) (1pc)
AA. Reducer (1/8” NPT F to 1/4” NPT M) (1pc)
Package #4 – Gauge Panel Installation:
BB CC DD EE FF GG
0
2
5
2
5
1
1
0
1
0
3
2
3
5
5
0
0
HH
II
JJ
BB. Dash Panel Gauge with ON/OFF Switch (1pc)
CC. Mounting Bolts (2pcs)
DD. Flat Washers (4pcs)
EE. Locking Washers (2pcs)
FF. Nuts (2pcs)
GG. Push-on Female Terminals (2pcs)
HH. 12-gauge Ring Terminal (1pc)
II. 12-gauge Butt Connectors (2pcs)
JJ. Self-tapping Screw (1pc)
USER MANUAL
MEDIUM DUTY ONBOARD AIR SYSTEM
P/N 10003
OBA PLUMBING DIAGRAM
Typical System Configuration, May Vary Depending on Installation
2.5 GALLON AIR TANK & PLUMBING (USE CONTENTS OF PARTS PACKAGE #1)
Your 2.5 Gallon air tank comes with six 1/4” NPT port openings to allow installation in many congurations on
your vehicle. To insure safe and trouble-free use of your air tank, we strongly recommend that you install the
supplied drain cock and a safety pressure relief valve. (See Figure 1)
Dash Panel
Gauge
Compression
Quick Connect
Coupler
Fitting
Safety
Valve
(Figure 1)
2.5
Gallon
Tank
Drain
Cock
Pressure Switch
with Relay
Reducer
Leader Hose
From Compressor
Tank Fittings:
Install the supplied compression ttings and/or quick connect tting for the air tank in areas where they are
most appropriate for your installation using thread sealant. Make sure that the safety valve is installed in the
top most position on the tank, and that the drain cock is installed in the lowest position on the tank if the tank
is to be installed in any other position than upright on the tank’s mounting legs. Be sure that all ttings are
accessible later in the installation process since you will have to plumb air lines to each tting as needed to
utilize the air tank.
Mounting the Tank:
We have included 6 pieces of rubber bushings in your tank mounting hardware. You have the option of using
two layers of rubber bushings on one of your tank lags to slightly tilt tank toward the drain cock to improve
drainage. Use the provided longer bolts, and corresponding washers, and nuts to mount the tank to a suitable
chassis or body point on your vehicle.
IMPORTANT:
- Tank is rated for 150 PSI maximum working pressure.
- Tank is NOT to be used as a breathing device.
- Bleed pressure from tank before servicing or adding attachments.
- Use only attachments or tools rated for 150 PSI working pressure or less.
Plumbing Diagram:
CAUTION! DO NOT PRESSURIZE YOUR TANK UNTIL YOU HAVE INSTALLED
ALL NECESSARY PORT FITTINGS AND ACCESSORIES.
- Apply sealant to threads of ttings prior to assembly and tighten each part with a wrench.
- Do not over tighten if your port ttings are made from brass, since brass threads can be stripped.
- Always release air from tank before servicing.
WARNING: FAILURE TO DRAIN TANK AND REMOVE CONDENSATION
WILL CAUSE TANK TO RUST PREMATURELY.
- To remove accumulated condensation inside the tank, bleed pressure from tank until pressure is
approximately 5-20 PSI using drain cock
- Drain tank by opening the drain cock drain valve and close after draining tank.
- If drain cock valve is plugged, release all air pressure from tank, remove drain valve and clean, then reinstall.
IMPORTANT: Please observe air tank’s Date of Manufacture (stamped on tank leg).
Replace air tank 2 to 5 years from date air tank was rst used, or use the date of manufacture as reference.
Adhering to air tank draining guidelines will prolong the life of your air tank.
PLEASE NOTE: RUSTED TANKS CAN FAIL CAUSING EXPLOSIONS OR FATAL INJURIES.
Discard tank immediately if tank is rusted.
SAFETY VALVE: When using a safety pressure relief valve, point the safety pressure relief valve away
from your body when releasing air. Use the pull ring on the safety relief valve to vent pressure from the
tank before servicing.
USER MANUAL
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