Case 770 EX, Руководство по обслуживанию

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INTRODUCTION
Torque - 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) .
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STANDARD TORQUE DATA FOR HYDRAULIC TUBES AND FITTINGS
TUBE NUTS FOR 37° FLARED FITTINGS O-RING BOSS PLUGS
ADJUSTABLE FITTING
LOCKNUTS, SWIVEL
JIC- 37° SEATS
SIZE TUBING OD THREAD
SIZE
TORQUE TORQUE
4 6.4 mm ( 1/4 in ) 7/16-20 12 – 16 N·m ( 9 – 12 lb ft ) 8 – 14 N·m ( 6 – 10 lb ft )
5
7.9 mm ( 5/16 in ) 1/2-20 16 – 20 N·m ( 12 – 15 lb ft ) 14 – 20 N·m ( 10 – 15 lb ft )
6 9.5 mm ( 3/8 in ) 9/16-18 29 – 33 N·m ( 21 – 24 lb ft ) 20 – 27 N·m ( 15 – 20 lb ft )
8 12.7 mm ( 1/2 in ) 3/4-16 47 – 54 N·m ( 35 – 40 lb ft ) 34 – 41 N·m ( 25 – 30 lb ft )
10
15.9 mm ( 5/8 in ) 7/8-14 72 – 79 N·m ( 53 – 58 lb ft ) 47 – 54 N·m ( 35 – 40 lb ft )
12 19.1 mm ( 3/4 in ) 1-1/16-12 104 – 111 N·m ( 77 – 82 lb ft ) 81 – 95 N·m ( 60 – 70 lb ft )
14 22.2 mm ( 7/8 in ) 1-3/16-12 122 – 136 N·m ( 90 – 100 lb ft ) 95 – 109 N·m ( 70 – 80 lb ft )
16 25.4 mm ( 1 in ) 1-5/16-12 149 – 163 N·m ( 110 – 120 lb ft ) 108 – 122 N·m ( 80 – 90 lb ft )
20 31.8 mm ( 1-1/4 in ) 1-5/8-12 190 – 204 N·m ( 140 – 150 lb ft ) 129 – 158 N·m ( 95 – 115 lb ft )
24 38.1 mm ( 1-1/2 in ) 1-7/8-12 217 – 237 N·m ( 160 – 175 lb ft ) 163 – 190 N·m ( 120 – 140 lb ft )
32 50.8 mm ( 2 in ) 2-1/2-12 305 – 325 N·m ( 225 – 240 lb ft ) 339 – 407 N·m ( 250 – 300 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 to the 37° flare and the threads.
Install fitting and torque to specified torque, loosen fitting and retorque to specifications.
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