Page 35/37
May 2021
WOOD CHIPPER | User manual
5.2
Torque for hydraulic fittings
Tightening flange pipe fittings*
1.
Check the flange and flange seat for damage that may cause leaks.
2.
Align the pipe with the fitting before tightening it.
3.
Lubricate the connection and fasten the union nut manually until it is in its correct position.
4.
Use two wrenches to prevent the pipe(s) from turning. Position one wrench on the coupler; tighten the union
nut using the second wrench in accordance with the specified torque.
*The specified torques are based on lubricated couplers as in relation to reinstalling.
Pipe external
diameter
Nut size
measured along
the flat sides
Torque *
Recommended turning to tighten
the pipe (after tightening
manually)
(in.)
(in.)
(N·m)
(lb-ft)
(Flat sides)
(Tighten)
3/16
7/16
8
6
1
1/6
1/4
9/16
12
9
1
1/6
5/16
5/8
16
12
1
1/6
3/8
11/16
24
18
1
1/6
1/2
7/8
46
34
1
1/6
5/8
1
62
46
1
1/6
3/4
1-1/4
102
75
3/4
1/8
7/8
1-3/8
122
90
3/4
1/8
