CJ3A Operation and Care
Manual --  Plowing Method, PTO and Vehicle Speeds


Method of Plowing with the Universal Jeep

To avoid loss of time and minimize turning at the headlands while plowing a field, the following procedure is recommended:

Lay out the field lengthwise in convenient lands or sections as shown by the back furrows in Fig. 38.  The width of the lands will vary according to the field size; however, make the lands as near ten rods in width as possible.  Should the lands be too narrow, time will be lost in turning at the headlands and in completing dead furrows; if too wide, time will be lost in driving across the headlands.

Plow a shallow marker furrow across each end of the field, parallel with and 20 feet from the end, to act as a guide in keeping the headlands straight.

Set up a target at each end of the field to indicate the line of the first back furrow.  Plow a furrow between the headland marks, using the target as a guide to keep the furrow straight and parallel with the edge of the field.  Turn and plow a second furrow against the first to complete the back furrow.  It is advisable to have the plow set to turn a shallow furrow and use care that the second furrow does not overlap the first, otherwise an objectionable ridge will be formed the length of the field.  Next adjust the plows for standard depth and plow around the back furrow until the unplowed space at the side of the field is equal to the width of the headlands previously marked off.

Throw a new back furrow in the same manner at the next back furrow line and plow around it until the unplowed portion between the lands equals that which has been plowed around the new back furrow.  To reduce driving distance, plow around the unplowed portion between the two back furrows until it is completed to form a dead furrow.  When plowing the dead furrow, set the plows shallow to prevent forming an objectionable trench the length of the field.

Continue with new lands, started by back furrows, until the width of the unplowed ground at each side of the field equals the marked-off headlands at each end of the field.

If it is desired, to prevent close turns, the operator may plow one side of a back furrow returning across the field plowing the opposite side of the next back furrow.  Plowing around the two back furrows until the two plowed sections are wide enough to allow easy turns may save some time.

Next plow the headlands around the field.  Plow the ground out toward the edge:  next time the field should be plowed in toward the centre.  If it is decided to plow “out”, start at the outer edge, plowing around the field until the headlands are completed.  This will leave a dead furrow around the field at the inner edge of the headlands.  To plow “in”, start at the inner edge of the headlands and the dead furrow will be at the outer edge of the field.
 


 

Power Take-Off and Vehicle Speeds

To satisfactorily operate most power-driven equipment, the operator should know the speed of the power take-off shaft or the belt pulley as well as the vehicle ground speed.  A great variety of speeds are made available by the manual governor control, the gear ratios in the transmission and transfer case and by interchanging the gears in the power take-off housing.

The tables below indicate the speeds for each of the nine positions of the manual governor control.  Note that the shaft speeds are all computed with the vehicle in four-wheel drive and that of the belt pulley in the transmission drive only.  Reference to these tables will be of material assistance especially in the operation of the farm combine or grain seperator.

Power Take-off Shaft Speeds (R.P.M.) and Vehicle Ground Speeds (M.P.H.)
Power Take-Off Gear Ratios


 

  20-24 RATIO   24-20 RATIO  
  Transmission Gear In   Transmission Gear In  
    Low Intermdiate High Low Intermediate High  
Governor Control
Positions
Transfer In Take-Off Shaft
RPM
Vehicle Speed
MPH
Take-Off Shaft
RPM
Vehicle Speed
MPH
Take-Off Shaft
RPM
Vehicle Speed
MPH
Take-Off Shaft
RPM
Vehicle Speed
MPH
Take-Off Shaft
RPM
Vehicle Speed
MPH
Take-Off Shaft
RPM
Take-Off Shaft
RPM
Engine Speed
1 Low
High
298
298 
2.22
5.40 
537
537 
4.01
9.75 
833
833 
6.22
15.13 
428
428 
2.22
5.40 
773
773 
4.01
9.75 
1200
1200 
6.22
15.13 
1000
2 Low
High
357
357 
2.67
6.48 
644
644 
4.81
11.71 
1000
1000 
7.47
18.15 
514
514 
2.67
6.48 
928
928 
4.81
11.71 
1440
1440 
7.47
18.15 
1200
3 Low
High
417
417 
3.11
7.56 
752
752 
5.62
13.66 
1166
1166 
8.72
21.17 
600
600 
3.11
7.56 
1083
1083 
5.62
13.66 
1680
1680 
8.72
21.17 
1400
4 Low
High
476
476 
3.56
8.65 
859
859 
6.42
15.61 
1333
1333 
9.96
24.20 
685
685 
3.56
8.65 
1237
1237 
6.42
15.61 
1920
1920 
9.96
24.20 
1600
5 Low
High
536
536 
4.00
9.73 
967
967 
7.22
17.56 
1500
1500 
11.20
27.22 
771
771 
4.00
9.73 
1392
1392 
7.22
17.56 
2160
2160 
11.20
27.22 
1800
6 Low
High
595
595 
4.44
10.81 
1074
1074 
8.02
19.51 
1666
1666 
12.45
30.25 
857
857 
4.44
10.81 
1547
1547 
8.02
19.51 
2400
2400 
12.45
30.25 
2000
7 Low
High
655
655 
4.89
11.89 
1182
1182 
8.83
21.46 
1833
1833 
13.70
33.27 
942
942 
4.89
11.89 
1702
1702 
8.83
21.46 
2640
2640 
13.70
33.27 
2200
8 Low
High
714
714 
5.34
12.97 
1289
1289 
9.63
23.41 
2000
2000 
14.94
36.31 
1028
1028 
5.34
12.97 
1856
1856 
9.63
23.41 
2880
2880 
14.94
36.31 
2400
9 Low
High
774
774 
5.78
14.05 
1396
1396 
10.43
25.36 
2166
2166 
16.19
39.33 
1114
1114 
5.78
14.05 
2011
2011 
10.43
25.36 
3120
3120 
16.19
39.33 
2600

Pulley Speeds (R.P.M.) -- 8" Pulley.  Power Take Off Gear Ratios.

  20-24 RATIO   24-20 RATIO  
  Transmission Gear In   Transmission Gear In  
Governor Control Position Low Intermediate High Low Intermediate High Engine Speed
1 255 460 714 367 663 1028 1000
2 306 552 857 440 795 1234 1200
3 357 645 1000 514 928 1440 1400
4 408 737 1143 587 1061 1645 1600
5 459 829 1285 660 1193 1851 1800
6 510 921 1428 734 1326 2057 2000
7 561 1013 1571 807 1458 2262 2200
8 612 1105 1714 881 1591 2468 2400
9 663 1197 1857 954 1723 2674 2600

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