Tapered Pipe Thread Fittings - MacDon A40D Operator's Manual

Table 7.13 O-Ring Face Seal (ORFS) Hydraulic Fittings (continued)
SAE Dash Size
-20
-24
-32

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.
4. Torque the connector to the appropriate torque angle. The turns from finger tight (TFFT) and flats from finger tight
(FFFT) values are shown in Table
elbow) is aligned to receive the incoming tube or hose assembly. Always finish the alignment of the fitting in the
direction of tightening. Never loosen the threaded connectors to achieve alignment.
5. Clean all residue and any excess thread conditioner with an appropriate cleaner.
6. Inspect the final condition of the fitting. Pay special attention to the possibility of cracks in the port opening.
7. Mark the final position of the fitting. If a fitting leaks, disassemble the fitting and check it for damage.
NOTE:
The failure of fittings due to over-torquing may not be evident until the fittings are disassembled and inspected.
Table 7.14 Hydraulic Fitting Pipe Thread
Tapered Pipe Thread Size
1/8–27
1/4–18
3/8–18
1/2–14
3/4–14
1–11 1/2
1 1/4–11 1/2
1 1/2–11 1/2
2–11 1/2
11. Torque values and angles shown are based on lubricated connection as in reassembly.
262334
Thread Size (in.) Tube O.D. (in.)
1 11/16
2
2 1/2
7.14, page 242. Ensure that the tube end of a shaped connector (typically a 45° or 90°
Recommended TFFT
REFERENCE
1 1/4
1 1/2
2
2–3
2–3
2–3
2–3
1.5–2.5
1.5–2.5
1.5–2.5
1.5–2.5
1.5–2.5
242
Torque Value 11
Nm
205–226 151–167
315–347 232–256
510–561 376–414
Recommended FFFT
12–18
12–18
12–18
12–18
12–18
9–15
9–15
9–15
9–15
lbf·ft
Revision A