Standard Torque For Fasteners
NOTE: Take care to avoid mixing metric and inch dimensioned fasteners. Mismatched or incorrect fasteners can result in vehicle damage or malfunction, or possible injury. Exceptions to these torques are given in this Service Manual where needed.
NOTE: Prior to installation of any hardware, be sure components are in satisfactory condition. Bolt and threads must not be worn or damaged. Hardware must be free of rust and corrosion. Clean hardware with a non-corrosive cleaner and apply engine oil to threads and bearing face. If thread lock or other compounds are to be applied, do not apply engine oil.
Standard Torque For O-Ring Face Seal Fittings And 37° Flared Fittings
NOTE: Use 50 percent of the above torque values when either the fitting or port material is non-ferrous.
O-Ring Face Seal Fitting
O-Ring Face Seal Fittings
1. O-ring face seal fitting. 2. O-ring groove. 3. O-ring face seal nut. 4. O-ring. 5. Straight thread O-ring port end fitting.
Fitting Installation
Hydraulic Line Installation
- 1. For a metal tube to hose connection, install the tube and tighten all bolts finger tight.
- 2. Tighten the bolts at the rigid end.
- 3. Install the hose and tighten all bolts finger tight.
- 4. Put the hose in a position so that is does not make contact with the machine or another hose.
- 5. Tighten the bolts on both connections.
- 6. Start the engine.
- 7. Move the implement control levers to all positions.
- 8. Look at the hose during movement of the implement. Make sure hose is not in contact with the machine or other hoses.
- 9. Shut off the engine.
- 10. If necessary, put the hose in a new position where it will not make contact when the implement is moved.
Assembly Off Fittings With Straight Threads And O-Ring Seals
This type of fitting is used in many applications. The tube end of the fitting will be different in design so that it can be used in many different applications. However, the installation procedure of the fitting is the same. If the tube end of the fitting body is the same as in the installation (either an elbow or a straight body) it will be necessary to assemble the sleeve on the tube before connecting the tube to the end.
Elbow Body Assembly
1. End of fitting body (connects to tube). 2. Fitting body. 3. Locknut. 4. Backup washer. 5. O-ring seal. 6. End of fitting that goes into other parts.
- 1. Put locknut (3), backup washer (4) and O-ring seal (5) as far back on the fitting body (2) as possible. Hold these components in this position. Turn the fitting into the part it is used on until backup washer (4) just makes contact with the face of the part it is used on.
- 2. To put the fitting assembly in its correct position, turn the fitting body (2) out (counterclockwise) a maximum of 359 degrees. Tighten locknut (3) to the torque shown in the correct chart for the fitting used.
NOTE: If the fitting is a connector (straight fitting), the hex on the body takes the place of the locknut. To install this type of fitting, tighten the hex against the face of the part it goes into.
Torques For Flared And O-Ring Fittings
The torques shown in the charts that follow are to be used on the nut part of 37 Degree Flared, 45 Degree Flared, and inverted Flared fittings (when used with steel tubing), O-Ring plugs, O-Ring fittings and swivel nuts when used in applications to 20700 kPa (3000 psi)
37° Flared Fittings
45° Flared and 45° Inverted Flare Fittings
Tapered Pipe Thread Fittings
Tightening Other Fittings
Hi Duty (Shear Sleeve) Tube Fittings
After tube has been put through the nut and makes contact against the tube shoulder in the fitting body, turn the nut with a wrench until a small decrease in torque is felt. This is an indication that the sleeve has been broken off the nut. Hold the tube to prevent turning and tighten the nut 1 1/2 turns.
Hi Seal Fittings
Put nut and sleeve over the tubing with the short heavy end of the sleeve facing the end of tubing. Put the tube end against the counterbore in the body of the fitting and tighten until nut is over the last thread on the body. The remainder of space is used whenever the fitting is removed and installed again.
Torques For Constant Torque Hose Clamps
A constant torque hose clamp can be used in place of any standard hose clamp. Make sure the constant torque hose clamp is the same size as the standard clamp. Due to extreme temperature changes, hose will heat seat. Heat setting causes hose clamps to loosen. Loose hose clamps can result in leaks. There have been reports of component failures caused by hose clamps loosening. The new, constant torque hose clamp will help prevent these failures.
Each installation application can be different depending on the type of hose, fitting material and anticipated expansion or contraction of the hose and fittings. A torque wrench should be used for proper installation of the new, constant torque hose clamps. Constant torque hose clamps should be installed as follows:
- * To allow for maximum expansion install clamps at 5.7 N·m (50 lb in).
- * To allow for equal expansion and contraction, install clamps at 10.2 N·m (90 lb in).
- * To allow for maximum contraction, install clamps at 14.1 N·m (125 lb in).
- * To allow for equal expansion and contraction, install clamps at 10.2 N·m (90 lb in).