J&M 250-7S, Operator'S Manual

Page: 5 / 31

5
General Information
BOLT TORQUE CHART
Always tighten hardware to these values unless a different torque or tightening procedure is listed for specific application.
Fasteners must always be replaced with the same grade as specified in the manual parts list.
Always use the proper tool for tightening hardware: SAE for SAE hardware and Metric for Metric hardware.
Make sure fastener threads are clean and you start thread engagement properly.
All torque values are given to specifications used on hardware defined by SAE J1701 & J1701M (JUL 96)
A
A
SAE SERIES
TORQUE
CHART
METRIC SERIES
TORQUE
CHART
10.9
8.8
Diameter
(Inches)
A
Wrench
Size
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
7/16”
1/2”
9/16”
5/8”
3/4”
13/16”
15/16”
1-1/8”
1-5/16”
1-1/2”
6
12
23
36
55
78
110
192
306
467
8
17
31
48
75
106
149
261
416
634
10
19
35
55
85
121
170
297
474
722
13
26
47
75
115
164
230
403
642
979
14
27
49
78
120
171
240
420
669
1020
18
37
67
106
163
232
325
569
907
1383
MARKING ON HEAD
SAE 2
SAE 5 SAE 8
LBS.-FT. LBS.-FT. LBS.-FT. N-m
N-m N-m
Diameter
&
(Millimeters)
Thread Pitch
6 x 1.0
8 x 1.25
10 x 1.5
12.1.75
14 x 2.0
16 x 2.0
18 x 2.5
20 x 2.5
22 x 2.5
24 x 3.0
30 x 3.0
10 mm
13 mm
16 mm
18 mm
21 mm
24 mm
27 mm
30 mm
34 mm
36 mm
46 mm
8
20
39
68
109
169
234
330
451
571
1175
6
15
29
50
80
125
172
244
332
421
867
11
27
54
94
151
234
323
457
623
790
1626
8
20
40
70
111
173
239
337
460
583
1199
8
21
41
75
118
181
263
367
495
623
1258
6
16
30
55
87
133
194
270
365
459
928
11
29
57
103
163
250
363
507
684
861
1740
8
22
42
76
120
184
268
374
505
635
1283
6 x 1.0
8 x 1.0
10 x 1.25
12.1.25
14 x 1.5
16 x 1.5
18 x 1.5
20 x 1.5
22 x 1.5
24 x 2.0
30 x 2.0
Metric 10.9 Metric 8.8 Metric 8.8 Metric 10.9
MARKING ON THREAD MARKING ON THREAD
COARSE THREAD FINE THREAD
Wrench
Size
Diameter
&
(Millimeters)
Thread Pitch
Metric Bolt Head
Identification
SAE Bolt Head
Identification
Metric
Grade 8.8
Metric
Grade 10.9
SAE Grade 2
(No Dashes)
SAE Grade 5
3 Radial Dashes
SAE Grade 8
6 Radial Dashes
TIGHTENING WHEEL NUTS & TIRE PRESSURE
Standard 9/16” wheel bolts should be tightened to torque 190 Ft.-Lbs. during initial operation of the gravity wagon and then
checked for proper torque after every 10 hours of use. Failure to do so may damage wheel nut seats. Once seats are damaged, it
will become impossible to keep nuts tight. The correct tire pressure for the 325/65 R22.5 tire is 75 PSI and for the 385/65 R22.5 the
correct tire pressure is 70 PSI.