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Page Title:
Table VII. Vehicle forward speeds and transmission PTO openings |
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|  MIL-T-62735
Table VII. Vehicle forward speeds and transmission PTO openings. (continued).
Model
Class
Minimum number of vehicle
PTO
forward speeds
openings
Dump truck and truck tractor
Truck
All
4x4
9 transmission speeds,
9
1
9 to 18 vehicle speeds
6x6
All
9 transmission speeds,
9
1
9 to 18 vehicle speeds
6x4
32 to 34
9
8
2
6x4
34.5 to 44
9
9
2
6x4
44.5 and over
13
13
2
8x4
All
13
13
2
8x6
All
9 transmission speeds,
9 transmission
1
18 vehicle speeds
speeds,
18 vehicle speeds
3.3.11.2 Power takeoff (PTO) openings. Unless otherwise specified, the manual
transmission shall have the number of PTO openings specified in table VII, all conforming to
SAE J704. When specified (see 6.2), or when required to power PTO driven equipment, the
PTO opening shall be of the heavy duty type. The clearance envelope for all transmission PTO
openings shall conform to SAE J772.
3.3.11.3 Clutch. The clutch shall be the largest capacity clutch offered for the type,
model and class of vehicle and engine. Clutch torque capacity shall exceed the maximum
delivered engine torque. The clutch lining shall be asbestos free. The clutch on model 6x4, 6x6,
8x4 and 8x6 shall have spring dampening and a greaseable bearing.
3.3.11.4 Transfer case. Model 4x4, 6x6 and 8x6 shall have a transfer case. Unless
otherwise specified or required by table VII, the transfer case may have one or two speeds.
Unless the transfer case is equipped with devices which compensate for differential torque and
speeds between the front and rear axles, the transfer case shall provide for the driver to select
either rear wheel drive or front and rear wheel drive (except no drive is required for the pusher
axle on 8x4 and 8x6 models). When furnished, inter-axle compensating devices shall provide for
positive transfer of power to all driving axles.
3.3.11.4.1 Two speed transfer case. When specified (see 6.2) or when required in
accordance with table VII, the transfer case shall have two forward speeds. The speedometer
shall read accurate speed (km/h and mph) with the speed selector on two-speed transfer cases in
both high and low range.
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