Flareless Fluid Fittings

What does the flareless fitting eliminate the use of?

Tube flaring

What do flareless fittings require prior to installation?

Presetting

What are the three steps of presetting?

1. Tube preparation

2. Presetting in fitting

3. Final tightening

What is the first step of tube preparation?

Cut the tube to correct length with perfectly square ends

What is the second step of tube preparation?

Deburr the inside and outside of the tube

What is the third step of tube preparation?

slip the nut and sleeve over the tube

What is the final step of tube preparation?

Lubricate fitting and nut threads with hydraulic fluid

What is the first step of presetting in fitting?

Place fitting body in a vise

What is the second step of presetting in fitting?

Insert and hold tube squarely and firmly against the seat in the fitting

What is the third step of presetting in fitting?

Tighten the nut until the sleeve’s cutting edge grips the tube

What is the final step of presetting in fitting?

Rotate tube slightly while tightening; once tube no longer turn, it’s ready for final tightening

For the final tightening, how tight of the turn should be for aluminum tubing ≤1/2” OD?

1 - 1 1/6 turns

For the final tightening, how tight of the turn should be for steel or aluminum tubing over 1/2” OD?

1 1/6 - 1 ½ turns

When inspecting the presetting, how far should the tube extend?

3/32" to 1/8" beyond sleeve pilot

When inspecting the presetting, where should the sleeve pilot be?

• In contact with the tube

• Slight clearance

What is the maximum clearance for the sleeve pilot for aluminum tubing?

0.005”

What is the maximum clearance for the sleeve pilot for steel tubing?

0.015”

No movement of sleeve pilot is allowed except for…

Rotation

What are the components of a MS flareless fitting? (3)

• Body

• Sleeve

• Nut

MS flareless fitting are designed for high-pressure hydraulic systems that are subject to… (2)

• Severe vibration

• Fluctuating pressure

What is the PSI of the high-pressure hydraulic systems?

3000 PSI

How does the MS flareless fitting seal with the tube?

Sleeve cuts into the outside of the tube as nut and body are joined

What is the reverse angle of steel connectors counterbore should?

15 degrees

What is the reverse angle of aluminum fittings counterbore shoulder?

45 degrees

What is the functionality of the MS flareless fitting reverse angle? (2)

• Prevents inward collapse during tightening

• Provides partial sealing force at the body counterbore

What are the three steps of installing flareless tubes?

1. Initial tightening

2. Final tightening

3. Conduct pressure testing after installation

What is the only step of initial tightening for flareless tube installation?

Tighten nut by hand until resistance is felt

When unable to ttighten by hand for flareless tube installation, what should you be watch for when using a wrench?

Bottoming

What is the first step of final tightening for flareless tube installation?

Begin at point of bottoming

What is the second step of final tightening for flareless tube installation?

Turn nut 1/6 turn (one flat on hex nut)

What is the final step of final tightening for flareless tube installation?

Hold connector stationery with a wrench during tightening

If a leakage occur during pressure testing after installing a flareless tube, what should you do?

Tighten an additional 1/6 turn (total 1/3 turn)

If a leakage still occurs during pressure testing after tighten an additional 1/6 turn (total 1/3), what should you do?

Remove and inspect components

When inspecting the components because of leakage in flareless tube installation, what should you look for? (4)

• Scores

• Cracks

• Contamination

• Overtightening damage