Tapered Pipe Thread Fittings - MacDon D2 Series Operator's Manual

2. Apply hydraulic system oil to O-ring (B).
3. Align the tube or hose assembly so that the flat face of
sleeve (A) or (C) comes into full contact with O-ring (B).
4. Thread tube or hose nut (D) until it is hand-tight. The nut
should turn freely until it bottoms out.
5. Torque the fittings according to values in Table
349.
NOTE:
If applicable, hold the hex flange on fitting body (E) to
prevent the rotation of the fitting body and the hose when
tightening fitting nut (D).
6. Use three wrenches when assembling unions or joining two
hoses together.
7. Verify the final condition of the fitting.
Table 8.8 O-Ring Face Seal (ORFS) Hydraulic Fittings
SAE Dash Size
-3
-4
-5
-6
-8
-10
-12
-14
-16
-20
-24
-32

8.1.6 Tapered Pipe Thread Fittings

The standard torque values are provided for tapered pipe thread fittings. If a procedure specifies a different torque value
for the same type and size of fitting found in this topic, refer to the value specified in the procedure instead.
Assemble pipe fittings as follows:
1. Ensure that the fitting and the port threads are free of burrs, nicks, scratches, and any other form of contamination.
2. Apply paste-type pipe thread sealant to the external pipe threads.
3. Thread the fitting into the port until it is hand-tight.
87. Torque values and angles shown are based on lubricated connection as in reassembly.
88. O-ring face seal type end not defined for this tube size.
214509
8.8, page
Thread Size (in.) Tube O.D. (in.)
88
Note
9/16
Note 88
11/16
13/16
1
1 3/16
88
Note
1 7/16
1 11/16
1–2
2 1/2
REFERENCE
A
B
Figure 8.10: Hydraulic Fitting
3/16
1/4
5/16
3/8
1/2
5/8
3/4
7/8
1
1 1/4
1 1/2
2
349
D
E
Torque Value 87
Nm
–
25–28 18–21
–
40–44 29–32
55–61 41–45
80–88 59–65
115–127 85–94
–
150–165 111–122
205–226 151–167
315–347 232–256
510–561 376–414
C
lbf·ft
–
–
–
Revision A