RXF ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.410-IOM (JAN 12)
Page 39
SAE STRAIGHT THREAD O-RING FITTINGS - ASSEMBLY PROCEDURE FOR RXF 58 - 101
1. Inspect components to ensure that male and female port
threads and sealing surfaces are free of burrs, nicks and
scratches or any foreign material.
2. If the O-ring is not pre-installed to the tting on the male
end, install the proper size O-ring.
3. Lubricate the O-ring with a light coating of system oil or
petroleum jelly.
4. Screw the tting into the female port until the hex at
contacts the port face. Light wrenching may be necessary.
5. Tighten to the appropriate torque value shown in the
Assembly Torque Table.
ASSEMBLY TORQUE TABLE
Straight and Adjustable Fittings or Plugs (steel)
Fitting Size SAE Port Thread Size
Assembly Torque
Inch lb Foot lb
2 5/16 – 24 65 ± 5 5.5 ± 0.5
3 3/8 – 24 130 ± 10 11 ± 1.0
4 7/16 – 20 170 ± 10 14 ± 1.0
5 1/2 - 20 260 ± 15 22 ± 1.0
6 9/16 – 18 320 ± 20 27 ± 2.0
8 3/4 - 16 500 ± 25 42 ± 2.0
10 7/8 – 14 720 ± 30 60 ± 2.5
12
1Z\zn – 12
960 ± 50 80 ± 5.0
16
1B\zn – 12
1380 ± 75 115 ± 6.0
20
1B\, – 12
2700± 150 225 ± 12.0
24
1M\, - 12
3000 ± 160 250 ± 12.0
When performing maintenance or replacing the compres-
sor, the hydraulic tubing may need to be removed and
re-installed. The following procedure outlines the proper
installation of SAE straight thread ttings to SAE straight
thread ports.
The male and female ends of SAE straight thread O-ring
ports have UN/UNF straight threads. An elastomeric O-ring
is tted to the male end. On assembly, the O-ring is rmly
sandwiched between the angular sealing surface of the fe-
male port and the shoulder of the male end. Sealing is thus
affected and maintained by the O-ring compression which
results from the clamping force generated by the tightening
action. The straight threads do not offer sealing action; they
provide the resistance (holding power) for service pressure.
NOTE: Compressor port locations for RXF 58 -101 are located on the following page.
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