Case 2050M, Руководство оператора, Страница: 162 / 286

7 - MAINTENANCE
Torque - Hydraulic tubes and fittings - Standard torque data for hydraulics
Installation of adjustable fittings in straight
thread O-ring bosses
1. Lubricate the O-ring by coating it with a light oil or
petroleum. Install the O-ring in the groove adjacent
to the metal backup washer which is assembled at the
extreme end of the groove
(4) .
2. Install the fitting into the SAE straight thread boss until
the metal backup washer contacts the face of the boss
(5) .
NOTE: Do not over tighten and distort the metal
backup washer.
3. Position the fitting by turning out (counterclockwise)
up to a maximum of one turn. Holding the pad of the
fitting with a wrench, tighten the locknut and washer
against the face of the boss
(6) .
23085659
1
Standard torque data for hydraulic tubes and fittings
Standard torque data for hydraulic tubes and fittings
37 ° flare female swivel Straight thread O-ring Boss
(ORB)
Dash
Size
Tubing OD Thread size Torque Torque
-4 6.4 mm
( 1/4 in )
7/16-20
15 - 16 N·m
( 11 - 12 lb ft )
18 - 26 N·m
( 13 - 19 lb ft )
-5 7.9 mm
( 5/16 in )
1/2-20 19 - 21 N·m
( 14 - 15 lb ft )
23 - 26 N·m
( 17 - 19 lb ft )
-6 9.5 mm
( 3/8 in )
9/16-18 24 - 28 N·m
( 18 - 21 lb ft )
29 - 40 N·m
( 21 - 30 lb ft )
-8 12.7 mm
( 1/2 in )
3/4-16 49 - 53 N·m
( 36 - 39 lb ft )
49 - 57 N·m
( 36 - 42 lb ft )
-10 15.9 mm
( 5/8 in )
7/8-14 77 - 85 N·m
( 57 - 63 lb ft )
59 - 90 N·m
( 44 - 66 lb ft )
-12 19.1 mm
( 3/4 in )
1-1/16-12 107 - 119 N·m
( 79 - 88 lb ft )
93 - 128 N·m
( 69 - 94 lb ft )
-14 22.2 mm
( 7/8 in )
1-3/16-12 127 - 140 N·m
( 94 - 103 lb ft )
122 - 134 N·m
( 90 - 99 lb ft )
-16 25.4 mm
( 1 in )
1-5/16-12 147 - 154 N·m
( 108 - 114 lb ft )
151 - 174 N·m
( 111 - 128 lb ft )
-20 31.8 mm
( 1-1/4 in )
1-5/8-12 172 - 181 N·m
( 127 - 133 lb ft )
198 - 218 N·m
( 146 - 161 lb ft )
-24 38.1 mm
( 1-1/2 in )
1-7/8-12 215 - 226 N·m
( 159 - 167 lb ft )
209 - 235 N·m
( 154 - 173 lb ft )
These torques are not recommended for tubes of 12.7 mm ( 1/2 in ) OD and larger with wall thickness of 0.889 mm
( 0.035 in ) or less. The torque is specified for 0.889 mm ( 0.035 in ) wall tubes on each application individually.
Before installing and torquing 37 ° flared fittings, clean the face of the flare and threads with a clean solvent or Loctite
cleaner and apply hydraulic sealant L
OCTITE
® 569™ to the 37 ° flare and the threads.
Install fitting and torque to specified torque, loosen fitting and retorque to specifications.
7-6