LeeBoy 8515D, Operation, Service & Parts Manual

Page: 36 / 398

Coupling Installation
Use the following steps for proper coupling installation:
1. Determine the correct torque value for your
coupling.
NOTE: Only use the torque values specified from
the manufacturer. DO NOT use SAE torque
recommendations.
2. Ensure the seal face and threads are clean and in
good condition. O-Rings should be lubricated with
light oil, but threads should be completely dry unless
making pipe thread connections (interference seal).
NOTE: Attach the male end of the hose onto the
equipment first since it may be necessary to
rotate the entire hose assembly to tighten
the male threads. Then route the hose into
position while avoiding twisting the hose.
3. Tighten the connection (by hand), bringing the seal
face into contact and rotating the nut until it stops.
4. Mark a line across the coupling nut and backup hex
for the flats method verification of coupling torque.
5. Apply a wrench to the backup hex to prevent the
coupling and hose from moving while tightening the
nut with a torque wrench.
Failure to retain the backup hex during
installation will also result in additional clamp load
force that could cause damage to the seal face.
NOTE: The coupling nut must be in motion for an
accurate torque reading. If the nut is stopped
before final torque value is achieved, it must
be loosened and retightened until the torque
is attained while the nut is in motion.
If a torque wrench cannot fit into the coupling area or if
it is unavailable, the flats method may be used to ensure
that the coupling is properly tightened, as shown in the
following figure.
Example 2 Flats
difference
Mark Line on Nut
Figure 2-18. Flats Method Tightening
NOTE: The mark placed on the nut and backup hex
after tightening by hand should rotate during
final tightening according to the table below.
The nut and backup hex can then be marked
to indicate if the coupling loosens over time.
Table 2-19. Flats Method Values for Selected
Terminations
FLATS METHOD VALUES
Termination
Type
Dash Size Flats
JIC -4 1.5 - 1.75
JIC -6 1.0 - 1.5
JIC -8 1.5 - 1.75
JIC -10 1.0 - 1.5
JIC -12 1.0 - 1.5
JIC -16 .75 - 1.0
JIC -20 .75 - 1.0
JIC -24 .75 - 1.0
JIC -32 .75 - 1.0
JIS -4 .5 - 1.5
1. Seal faces must be in contact with the fitting fully
tightened by hand before marking flats.
2. The flats method is most accurate for the first
assembly cycle. For multiple disassembly and
assembly cycles, torque values are more reliable.
3. Tightening two (2) flats or more may damage seal
faces.
8515D Conveyor Paver
2-10
Information and Specifications