MacDon R85 Rotary Disc 13 Foot Pull-Type - Manual (Page 55)

MAINTENANCE AND SERVICING
Form 169454
53
Revision A
7.3 MAINTENANCE SPECIFICATIONS
7.3.1 Recommended Torques
• Tighten all bolts to the torques specified in
chart unless otherwise noted throughout this
manual.
• Check tightness of bolts periodically, using
bolt torque chart as a guide.
• Replace hardware with the same strength
bolt.
• Torque figures are valid for non-greased or
non-oiled threads and heads unless
otherwise specified. Do not grease or oil
bolts or capscrews unless specified in this
manual.
• When using locking elements, increase
torque values by 5%.
7.3.1.1 SAE Bolts
BOLT
DIA. "A"
in.
NC BOLT TORQUE*
SAE-5 SAE-8
lbf·ft N·m lbf·ft N·m
1/4 9 12 11 15
5/16 18 24 25 34
3/8 32 43 41 56
7/16 50 68 70 95
1/2 75 102 105 142
9/16 110 149 149 202
5/8 150 203 200 271
3/4 265 359 365 495
7/8 420 569 600 813
1 640 867 890 1205
* Torque categories for bolts and capscrews are
identified by their head markings.
7.3.1.2 Metric Bolts
BOLT
DIA.
"A"
COARSE BOLT TORQUE*
8.8 10.9
lbf·ft N·m lbf·ft N·m
M3 0.4 0.5 1.3 1.8
M4 2.2 3 3.3 4.5
M5 4 6 7 9
M6 7 10 11 15
M8 18 25 26 35
M10 37 50 52 70
M12 66 90 92 125
M14 103 140 148 200
M16 166 225 229 310
M20 321 435 450 610
M24 553 750 774 1050
M30 1103 1495 1550 2100
M36 1917 2600 2710 3675
* Torque categories for bolts and capscrews are
identified by their head markings.
SAE-5 SAE-8