I am replacing both coolant and hydraulic temperature sending sensors. Anyone know how the torque value needed when installing the new sending units? Respectfully, Mike from Cleveland
I have very little heavy equipment experience but a lot of automotive and industrial mechanical experience. When in doubt, we check with the manufacturer, but typically sensors are lightly torqued due to their material and light build. The seal makes a difference. Pipe threads need a lube/seal compound and a turn past interference. Copper and aluminum washers need enough torque to crush to seal. Fiber washers will take less torque but more torque than rubber washers. "O" rings are generally captured in a groove or cavity so not crushed when you snug them up. Pot metal or white metal components will not stand much torque at all before breaking. Generic info, sorry to say, but hope it helps.
All good points better than my reply would have been! "Tighten till it strips or breaks and back off 1/4 turn!" On a more serious reply see the attached file from Cat. It gives standard torques for many different fasteners, note that the bolt torques are for Grade 8 SAE also in the ISO fasteners beware that some are for 8.8 fasteners and some for 10.9 fasteners.