SkyTrak 8042 Service Manual - Manual (Page 33)

General Information and Specifications
2.8 Model 8042, 10042, 10054 Legacy Rev. 10/03
2.3.4 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
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” (1) condition.
4. Using a permanent type ink marker, make a mark (2)
on one of the flats on the nut and continue it onto the
static fitting or port.
5. Complete the joint by wrench tightening (3) the nut
the number of flats (4) specified in the table for the
size and type of fitting. This assembly procedure is
referred to as Flats From Finger Tight (FFFT).
6. A less desirable tightening method is nut torque.
First follow steps 1 & 2. Apply clean petroleum
based oil to the male thread. Finger tighten the nut
onto the fitting. Torque the nut to the value listed in
the table.
MA10,0810
1
2
3
4
Hose Ends, Tube Ends and Fitting Swivel Ends
To Fitting Male Ends
SAE
Size Tube
Conn.
(FFFT)
Swivel Nut
or
Hose Conn.
(FFFT)
Torque lb-ft (Nm)
w/Oiled
Threads
4 2 2 16 ± 3 (22 ± 4)
5 2 2 19 ± 4 (26 ± 5)
6 1-1/2 1-1/4 25 ± 5 (34 ± 7)
8 1-1/2 1 49 ± 10 (66 ± 14)
10 1-1/4 1 74 ± 11 (100 ± 15)
12 1-1/4 1 103 ± 15 (140 ± 20)
14 1 1 121 ± 18 (164 ± 24)
16 1 1 135 ± 35 (183 ± 47)
20 1 1 166 ± 33 (225 ± 45)
24 1 1 210 ± 40 (285 ± 54)
32 1 1 314 ± 54 (426 ± 73)
Straight & Adjustable O-Ring
Boss Fittings To
O-Ring Boss Ports
SAE Size Torque lb-ft (Nm)
4 14 ± 1 (19 ± 1)
6 23 ± 1 (31 ± 1)
8 41 ± 1 (56 ± 1)
10 45 ± 3 (61 ± 4)
12 72 ± 3 (98 ± 4)
16 118± 5 (160 ± 7)
20 154 ± 7 (209 ± 9)
24 162 ± 8 (220 ± 11)