Page 441 - 4300 Catalog Cover.pdf

4300 Catalog Assembly / Installation
Parker Hannifin Corporation
Tube Fittings Division
Columbus, Ohio
http://www.parker.com/tfd
T31
EO Troubleshooting Guide
Problems with bite type hydraulic fittings are most often
traced to faulty pre-set/assembly procedure.
Problem Solution
Tube not bottomed Check for a visible mark on the tube
end with EO fitting. (Fig. T47)
Shallow bite Inspect for turned up ridge of material
(collar). A failure to achieve this ridge
can be traced either to the nut not being
tightened enough or the tube not being
bottomed against the stop which al-
lowed the tube to travel forward with the
ferrule. In some instances this assembly
may be re-worked. (Fig. T48)
Over-set ferrule Too much pressure or more than rec-
ommended turns from finger tight were
used to pre-set ferrule, or the nut was
severely over-tightened in final assem-
bly. This assembly should be scrapped.
(Fig. T49)
Ferrule cocked The ferrule may become cocked on
on tube the tube when the tube end is not
properly lined up with the body. Gener-
ally, this condition is caused by faulty
tube bending. All bent tube assemblies
should drop into the fitting body prior
to make up. This assembly should be
scrapped.
(Fig. T50)
No bite If all of the prior checks have been
made and the ferrule still shows no sign
of biting the tube, it may be that the
tube is too hard. This assembly should
be scrapped. (Fig. T51)
Fig. T51 — No bite
Fig. T47 —Tube not bottomed Fig. T48 — Shallow bite
Fig. T49 — Over-set ferrule Fig. T50 — Ferrule cocked on
tube
Table T25 — EO Fitting troubleshooting guide
EO Assembly