SkyTrak 6042 Service Manual - Manual (Page 20)

General Information and Specifications
2.6 Model 6042 Legacy Origin 7/02
2.3 TORQUES
2.3.1 Fasteners
All fasteners (nuts, bolts, washers, etc.) are equal to SAE
Grade 5 (PC8.8) and are plated, unless otherwise specified.
2.3.2 Bolts and Nuts
Unless otherwise specified, the following values apply for
Grade 5 (PC8.8) nuts and bolts:
2.3.3 SAE 37° Flare Hydraulic Fittings
a. Assembly Procedure
Follow these steps when tightening hose ends, tube ends
and fitting swivel ends onto fitting male end connections
(Refer to Fig. 2-2).
Improper assembly of this type of joint will result in
leaking joints. Over tightening can result in cracking of the
female swivel seat or deformation of the male fitting
tapered seat. Under tightening will result in the joint
loosening during normal usage. Foreign material on
either seal surfaces will cause damage to one or both
mating parts when the joint is tightened, resulting in a
leaking joint.
1. Inspect both the male and female sealing cone
surfaces for burrs, scratches, dents, other damage,
or foreign material. If any damage is found on the
seat the part is to be rejected as unusable. Clean off
any foreign material from the sealing surfaces before
assembly.
2. Align the mating parts and check to see that the flare
seats properly on the nose of the fitting.
3. Finger tighten the nut onto the fitting. If necessary a
wrench may be used to snug the nut against the
fitting (30 lb-in maximum torque). This is considered
the “finger tight” (Fig. 2 -2, 1) condition.
Figure 2-2 F.F.F.T. Tightening Method
Size Torque Size Torque
Inch lb-ft Nm mm Nm lb-ft
1/4 9 12 6,0 10 7
5/16 17 24 8,0 25 18
3/8 31 42 10,0 50 37
7/16 50 68 -- -- --
1/2 75 102 12,0 80 59
9/16 110 150 14,0 130 95
5/8 150 203 16,0 200 146
3/4 250 340 20,0 360 263
7/8 380 515 22,0 510 372
1.0 585 793 24.0 650 475
MA10,0810
1
2
3
4
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