Bul. 4303-FS-Assembly 05/2021
© 2021 Parker Hannifin Corporation
Parker Hannifin Corporation
Tube Fittings Division
3885 Gateway Blvd
Columbus, OH 43228
phone 614 279 7070
http://www.parker.com/tfd
FastSeal Assembly Instructions & Troubleshooting
Troubleshooting
Unsure if tube is bottomed
Use tube marking tool or insertion depths in Table 2 to mark tube prior to insertion and to identify if
you have met appropriate depth when tube is inserted into nut.
Unable or difficult to push
tube into nut
Tube may be oversized or oval. Use tube making gauge to check for correct size and ovality. If tube
does not fit in gauge do not use, select another tube and use gauge to verify the size and ovality
before using.
OR
Ensure nut was not tightened more than hand tight onto fitting or mandrel body before inserting
tube. Do not wrench tighten nut before tube is fully inserted this may cause bite ring to begin to
preset, interfering with tube insertion.
Tube will not push to
marked depth on tube
Avoid O-ring damage,
DO NOT FORCE TUBE
. Remove tube and ensure tube is properly deburred
to at least 0.040in (1.0 mm) and is cleaned thoroughly. Inspect the tube to ensure it is round, within
dimensional specs (should easily fit in tube marking gauge). Ensure a small amount of oil is applied
to end of tube before inserting, use slight twist when inserting.
DO NOT FORCE, DO NOT USE A HAMMER
.
Gap not closed after
presetting
If gap of more than 0.01in (0.25mm) is detected, reassemble to last marked position, tighten nut ½
additional flat, inspect gap for closure.
Leaks at low pressure
Internal O-ring may be damaged. Contact Division for assistance.
Leaks at high pressure
Inspect the ferrule and sleeve to confirm there was no gap after presetting. Ensure connection was
tightened to proper Seal-Lok assembly torque per table S14 4300 catalog. Confirm Seal-Lok trap
seal is not damaged or missing. Internal O-ring may be damaged. Contact Division for assistance.
Tube moves in nut
after presetting or final
assembly
Preset was not done correctly.
DO NOT USE CONNECTION
. Remake tube assembly.
Tube pulls out of nut after
preset
Preset was not done correctly, tube too hard.
DO NOT USE CONNECTION
. Check tube material,
wall thickness and size. FastSeal nuts are intended for use with low carbon steel seamless or DOM
tube intended for hydraulic applications (reference SAE J524/J525).
Unsure what tubes to use
FastSeal nuts are intended for use with low carbon steel seamless or DOM tube intended for
hydraulic applications (reference SAE J524/J525). Use of the correct tube wall is critical to meet
performance criteria. Recommended tube walls can be found in Table 1.
WARNING
FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS AND/OR SYSTEMS DESCRIBED HEREIN OR RELATED ITEMS CAN CAUSE DEATH, PERSONAL
INJURY AND PROPERTY DAMAGE.
This document and other information from Parker Hannifin Corporation, its subsidiaries and authorized distributors provide product and/or system options for further investigation
by users having technical expertise. It is important that you analyze all aspects of your application and review the information concerning the product or system in the current prod-
uct catalog. Due to the variety of operating conditions and applications for these products or systems, the user, through its own analysis and testing, is solely responsible for making
the final selection of the products and systems and assuring that all performance, safety and warning requirements of the application are met.
The products described herein, including without limitation, product features, specifications, designs, availability and pricing, are subject to change by Parker Hannifin Corporation
and its subsidiaries at any time without notice.
Offer of Sale
The items described in this document are hereby offered for sale by Parker Hannifin Corporation, its subsidiaries or its authorized distributors. This offer and its acceptance are
governed by the provisions stated in the “Offer of Sale.”
