Challenger RB452, Service Manual, Page: 26 / 31

01-22 79033773 A Rev.
General Information
GENERAL SERVICE PROCEDURES
Bolt Torque Values
All bolts used on this machine are Grade 5 plated bolts
unless specified. Always replace with Grade 5 hardware
except where higher grades are specified. All Grade 5
bolts have three radial marks on the bolt head. Tighten all
hardware according to the following charts unless
specified differently in the manual.
Do not over tighten bolts as this can cause a bolt to fail
during operation.
See Specifications for wheel hardware torque.
Standard Bolt Torque Chart
Metric Bolt Torque Chart
Working Under the Tailgate
When the tailgate is raised for any maintenance or
service work, push the lockout valve into the LOCKED
position. This prevents the tailgate from being lowered.
The tailgate can only be lowered when the tailgate lockout
valve is released (pulled out).
Wheel Hardware
The wheels are fastened to the hubs with wheel nuts
installed on threaded studs in the hub flange. When
installing a wheel, clean the threads on the studs with a
steel brush and lubricate threads with oil. Tighten the
wheel hardware after every 50 hours of operation. See
Specifications for the correct torque.
Bolt Size Grade 2 Grade 5 Grade 8
Nm Lbf ft Nm Lbf ft Nm Lbf ft
5/16-18 15 11 24 17 33 25
3/8-16 27 20 42 31 59 44
7/16-14 43 32 67 49 95 70
1/2-13 66 49 105 76 145 105
9/16-12 95 70 150 110 210 155
5/8-11 130 97 205 150 285 210
3/4-10 235 170 360 265 510 375
7/8-9 225 165 585 430 820 605
1-8 340 250 875 645 1230 910
Standard Bolt Identification
Grade 2
No Marks Grade 5
3 Marks Grade 8
6 Marks
Bolt Size Class 5.8 Class 8.8 Class 10.9
Nm Lbf ft Nm Lbf ft Nm Lbf ft
M 5 x 0.8 4 3 6 5 9 7
M 6 x 1 7 5 11 8 15 11
M 8 x 1.25 17 12 26 19 36 27
M 10 x 1.5 33 24 52 39 72 53
M 12 x 1.75 58 42 91 67 125 93
M 14 x 2 92 68 145 105 200 150
M 16 x 2 145 105 225 165 315 230
M 18 x 2.5 195 145 310 230 405 300
M 20 x 2.5 280 205 440 325 610 450
M 24 x 3 480 355 760 560 1050 780
Identify metric bolts by the class number stamped on the bolt
head or nut. Higher numbers indicate higher strength.
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