FIGURE 3
Hose cut length tolerance
LENGTH
TOLERANCE
(PLUS OR MINUS) MM
Up to 300 mm, included
3
Over 300 mm through 450 mm, included
5
Over 450 mm through 900 mm, included
7
Over 900 mm
+ 1%(1)
(1)
Measured to nearest whole milimeter .
FIGURE 4
SAE J517 assembly length tolerance .
When cutting any hose it is important to understand the amount
of variation in length which is appropriate . The SAE provides the
guidelines shown in Figure 4 . Generally it is best to have a small
amount of extra hose in an assembly, however even a small
amount of extra length can be very problematic especially for
short hoses .
SKIVING AND BUFFING
Skiving or buffing should only be done as recommended in the
crimp specifications, most Gates products no longer require
skiving or buffing for installation .
Skiving is the removal of the hose cover down to the
reinforcement, Figure 5 . Skiving may be done with a wire
abrasion wheel or a hand skiving tool . Careful attention
should be paid to ensure that skive length is correct and the
reinforcement has not been damaged in the skiving process .
Buffing is the removal of some hose cover material while still
leaving material covering the hose reinforcement . This is done
both for wire and non-wire reinforced hose construction, and
when necessary for coupling installation . A grinding wheel is
used for buffing for consistency and to help prevent damage to
the reinforcement .
FIGURE 5
Picture of a skived hose end .
COUPLING INSTALLATION
Once the hose has been completely prepared dry fit all of the
couplings to ensure that the assembly length and orientation is
correct in the final assembly .
When two bent couplings are used on an assembly orientation
is critical, per SAE specifications the couplings must be within
±3° of desired . In order to achieve this begin by orienting the
coupling on the far end of the hose vertically downward, then
measure the orientation clockwise from this position for the
near end . Once positioned place a witness mark on the hose
and coupling . For hydraulic hoses the layline makes an ideal
way to confirm the proper orientation of the couplings .
Bear in mind that during the crimping process the assembly
will grow slightly due to compression of the ferrule and hose .
For assemblies which are very critical in length, compare
measurements before and after crimping on end of the assembly
so that compensation may be made for the change in length .
3
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