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Alaskan Bearhawk
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Date: 4-20-2020
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Number of Hours: 2.00
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Manual Reference:
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Brief Description: Parking Brake Valve Part 1
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The parking brake valve needed some AN fittings that would attach to 1/4in brake lines. Jim surmised that Scott just used normal 3D AN fittings and modified them for their uses. In order to accommodate 1/4in lines I had to make new modified fittings out of 4D nipples. I looked for a few hours online to get the proper springs that hold the valves closed. I got something that was almost identical, only in .230 in diameter. The original springs couldn’t be used because they fit inside a 3D nipple. I needed a spring with a larger diameter so it could sit on the machined shoulder inside the fitting. They turned out great, so I reassembled the valve and it’s good to go. To make the fitting I took a drill just under 1/4in and drilled out the fitting. I finished it with a 1/4in reamer. I matched the depth of the original fittings.
Compression Spring, Precision, 302 Stainless Steel, Finish Plain, Overall Length 5/8 In, Outside Dia 0.240 In, Wire Type Round, Wire Dia 0.026 In, End Type Closed and Ground, Compressed Length 0.203 In, Load 3.12 Lbs, Deflection @ Load 0.30 In, Spring Rate 10.41 Lbs/In, Meets/Exceeds ASTM A313, Package 5
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New on the left, old on the right
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