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My OBA serves several purposes. Powering the ARB locking differentials, running air impact tools, and inflating tires.
I have three air compressors: two Tusnami MV50 and one Max Flow MF-1052. One is in the engine compartment and switches off at 95 psi. This compressor is primarly for the locking differentials, but also feeds the air tanks. The two compressors in the truck bed feed the air tanks and switch off at 105 psi. I have two Powertank PT-15s that provide high pressure & volume, and can subsitute the air compressors if they fail. The CO2 can provide 140+ psi and up to 32 CFM.
There is a 3/8 ID hose that runs from the front to the back of the truck. The hose is fed by the air and CO2 tanks. The hose routes to each corner of the truck and is fitted with air ncouplers.
The pictures below show the OBA in more detail. Click on the picture to enlarge it. |
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PowerTank PT-15 CO2 systems with the Powertank adjustable regulator. |
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The Tusnami MV50 is in the engine compartment. It replaced the ARB compressor which failed. The MV-50 performs just as well, for less that half the cost. |
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This shows the MV50 connected to the distribution manifold in the engine compartment. |
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From left to right: Air inlet from compressor, rear locker, pressure switch/pressure relief valve, supply to the air tanks, front locker, hose network connection.
The locker solenoids are British standard pipe thread, which is nearly identical to national pipe thread. All fittings are switched except the pressure switch/pressure relief valve. |
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The hose from the front compressor enters through a bulkhead fitting behind these tanks. These tanks are 5 gallon purchased at OSH, and feed the other bed mounted tanks. |
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The Sun 2 1/2 gallon tank rides on top of my utility cage in the front of the truck bed.
The white tanks is made out of PVC cut to length. A barb fitting is screwed into the endcap. It is approximatly 1.5 gallons. |
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The two 5 gallon Sears tanks are below and to the left of the Sun tank. This shows the MV50 & MF-1052 compressor. These tanks are checked valved and do not backflow to the rest of the system. |
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This tank is made out of PVC like the white tank. I painted it black and mounted it to the cage with large hose clamps. |
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This switch releases air from all of the air tanks to the hose network. |
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This is where the air system is connected to the hose network. The check valve prevents CO2 from back flowing into the air tanks. |
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I have "T" style quick connectors at all four corners of the Tacoma. The second connector shown can connect to an air supply from an outside source, while airing up the tires. |
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These hoses are custom made to connect from the four quick connectors to the tires. Airing up/down all four tires at the same time assures equal and correst tire pressure, and saves time. |
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This shows the front left tire connected to the hose network with the custom hose. I have custom length hose for all four tires. |
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This gauge is used to check tire pressure when deflating for trail and inflating for the street. Behind the gauge is the ball valve that deflates the tires in the same manner that the tires are inflated. |
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